Struct ffmpeg_next::codec::encoder::audio::Encoder

source · 
pub struct Encoder(pub Audio);

Tuple Fields§

§0: Audio

Implementations§

source§

impl Encoder

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pub fn encode<P: Mut>( &mut self, frame: &Audio, out: &mut P, ) -> Result<bool, Error>

👎Deprecated since 4.4.0: Underlying API avcodec_encode_audio2 has been deprecated since FFmpeg 3.1; consider switching to send_frame() and receive_packet()
source

pub fn flush<P: Mut>(&mut self, out: &mut P) -> Result<bool, Error>

👎Deprecated since 4.4.0: Underlying API avcodec_encode_audio2 has been deprecated since FFmpeg 3.1; consider switching to send_eof() and receive_packet()
source

pub fn frame_size(&self) -> u32

Examples found in repository?
examples/transcode-audio.rs (line 49)
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fn filter(
    spec: &str,
    decoder: &codec::decoder::Audio,
    encoder: &codec::encoder::Audio,
) -> Result<filter::Graph, ffmpeg::Error> {
    let mut filter = filter::Graph::new();

    let args = format!(
        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
        decoder.time_base(),
        decoder.rate(),
        decoder.format().name(),
        decoder.channel_layout().bits()
    );

    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;

    {
        let mut out = filter.get("out").unwrap();

        out.set_sample_format(encoder.format());
        out.set_channel_layout(encoder.channel_layout());
        out.set_sample_rate(encoder.rate());
    }

    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
    filter.validate()?;

    println!("{}", filter.dump());

    if let Some(codec) = encoder.codec() {
        if !codec
            .capabilities()
            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
        {
            filter
                .get("out")
                .unwrap()
                .sink()
                .set_frame_size(encoder.frame_size());
        }
    }

    Ok(filter)
}

Methods from Deref<Target = Audio>§

source

pub fn set_rate(&mut self, rate: i32)

Examples found in repository?
examples/transcode-audio.rs (line 100)
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fn transcoder<P: AsRef<Path> + ?Sized>(
    ictx: &mut format::context::Input,
    octx: &mut format::context::Output,
    path: &P,
    filter_spec: &str,
) -> Result<Transcoder, ffmpeg::Error> {
    let input = ictx
        .streams()
        .best(media::Type::Audio)
        .expect("could not find best audio stream");
    let context = ffmpeg::codec::context::Context::from_parameters(input.parameters())?;
    let mut decoder = context.decoder().audio()?;
    let codec = ffmpeg::encoder::find(octx.format().codec(path, media::Type::Audio))
        .expect("failed to find encoder")
        .audio()?;
    let global = octx
        .format()
        .flags()
        .contains(ffmpeg::format::flag::Flags::GLOBAL_HEADER);

    decoder.set_parameters(input.parameters())?;

    let mut output = octx.add_stream(codec)?;
    let context = ffmpeg::codec::context::Context::from_parameters(output.parameters())?;
    let mut encoder = context.encoder().audio()?;

    let channel_layout = codec
        .channel_layouts()
        .map(|cls| cls.best(decoder.channel_layout().channels()))
        .unwrap_or(ffmpeg::channel_layout::ChannelLayout::STEREO);

    if global {
        encoder.set_flags(ffmpeg::codec::flag::Flags::GLOBAL_HEADER);
    }

    encoder.set_rate(decoder.rate() as i32);
    encoder.set_channel_layout(channel_layout);
    #[cfg(not(feature = "ffmpeg_7_0"))]
    {
        encoder.set_channels(channel_layout.channels());
    }
    encoder.set_format(
        codec
            .formats()
            .expect("unknown supported formats")
            .next()
            .unwrap(),
    );
    encoder.set_bit_rate(decoder.bit_rate());
    encoder.set_max_bit_rate(decoder.max_bit_rate());

    encoder.set_time_base((1, decoder.rate() as i32));
    output.set_time_base((1, decoder.rate() as i32));

    let encoder = encoder.open_as(codec)?;
    output.set_parameters(&encoder);

    let filter = filter(filter_spec, &decoder, &encoder)?;

    let in_time_base = decoder.time_base();
    let out_time_base = output.time_base();

    Ok(Transcoder {
        stream: input.index(),
        filter,
        decoder,
        encoder,
        in_time_base,
        out_time_base,
    })
}
source

pub fn rate(&self) -> u32

Examples found in repository?
examples/transcode-audio.rs (line 32)
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fn filter(
    spec: &str,
    decoder: &codec::decoder::Audio,
    encoder: &codec::encoder::Audio,
) -> Result<filter::Graph, ffmpeg::Error> {
    let mut filter = filter::Graph::new();

    let args = format!(
        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
        decoder.time_base(),
        decoder.rate(),
        decoder.format().name(),
        decoder.channel_layout().bits()
    );

    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;

    {
        let mut out = filter.get("out").unwrap();

        out.set_sample_format(encoder.format());
        out.set_channel_layout(encoder.channel_layout());
        out.set_sample_rate(encoder.rate());
    }

    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
    filter.validate()?;

    println!("{}", filter.dump());

    if let Some(codec) = encoder.codec() {
        if !codec
            .capabilities()
            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
        {
            filter
                .get("out")
                .unwrap()
                .sink()
                .set_frame_size(encoder.frame_size());
        }
    }

    Ok(filter)
}
source

pub fn set_format(&mut self, value: Sample)

Examples found in repository?
examples/transcode-audio.rs (lines 106-112)
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fn transcoder<P: AsRef<Path> + ?Sized>(
    ictx: &mut format::context::Input,
    octx: &mut format::context::Output,
    path: &P,
    filter_spec: &str,
) -> Result<Transcoder, ffmpeg::Error> {
    let input = ictx
        .streams()
        .best(media::Type::Audio)
        .expect("could not find best audio stream");
    let context = ffmpeg::codec::context::Context::from_parameters(input.parameters())?;
    let mut decoder = context.decoder().audio()?;
    let codec = ffmpeg::encoder::find(octx.format().codec(path, media::Type::Audio))
        .expect("failed to find encoder")
        .audio()?;
    let global = octx
        .format()
        .flags()
        .contains(ffmpeg::format::flag::Flags::GLOBAL_HEADER);

    decoder.set_parameters(input.parameters())?;

    let mut output = octx.add_stream(codec)?;
    let context = ffmpeg::codec::context::Context::from_parameters(output.parameters())?;
    let mut encoder = context.encoder().audio()?;

    let channel_layout = codec
        .channel_layouts()
        .map(|cls| cls.best(decoder.channel_layout().channels()))
        .unwrap_or(ffmpeg::channel_layout::ChannelLayout::STEREO);

    if global {
        encoder.set_flags(ffmpeg::codec::flag::Flags::GLOBAL_HEADER);
    }

    encoder.set_rate(decoder.rate() as i32);
    encoder.set_channel_layout(channel_layout);
    #[cfg(not(feature = "ffmpeg_7_0"))]
    {
        encoder.set_channels(channel_layout.channels());
    }
    encoder.set_format(
        codec
            .formats()
            .expect("unknown supported formats")
            .next()
            .unwrap(),
    );
    encoder.set_bit_rate(decoder.bit_rate());
    encoder.set_max_bit_rate(decoder.max_bit_rate());

    encoder.set_time_base((1, decoder.rate() as i32));
    output.set_time_base((1, decoder.rate() as i32));

    let encoder = encoder.open_as(codec)?;
    output.set_parameters(&encoder);

    let filter = filter(filter_spec, &decoder, &encoder)?;

    let in_time_base = decoder.time_base();
    let out_time_base = output.time_base();

    Ok(Transcoder {
        stream: input.index(),
        filter,
        decoder,
        encoder,
        in_time_base,
        out_time_base,
    })
}
source

pub fn format(&self) -> Sample

Examples found in repository?
examples/transcode-audio.rs (line 30)
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fn filter(
    spec: &str,
    decoder: &codec::decoder::Audio,
    encoder: &codec::encoder::Audio,
) -> Result<filter::Graph, ffmpeg::Error> {
    let mut filter = filter::Graph::new();

    let args = format!(
        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
        decoder.time_base(),
        decoder.rate(),
        decoder.format().name(),
        decoder.channel_layout().bits()
    );

    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;

    {
        let mut out = filter.get("out").unwrap();

        out.set_sample_format(encoder.format());
        out.set_channel_layout(encoder.channel_layout());
        out.set_sample_rate(encoder.rate());
    }

    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
    filter.validate()?;

    println!("{}", filter.dump());

    if let Some(codec) = encoder.codec() {
        if !codec
            .capabilities()
            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
        {
            filter
                .get("out")
                .unwrap()
                .sink()
                .set_frame_size(encoder.frame_size());
        }
    }

    Ok(filter)
}
source

pub fn set_channel_layout(&mut self, value: ChannelLayout)

Examples found in repository?
examples/transcode-audio.rs (line 101)
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fn transcoder<P: AsRef<Path> + ?Sized>(
    ictx: &mut format::context::Input,
    octx: &mut format::context::Output,
    path: &P,
    filter_spec: &str,
) -> Result<Transcoder, ffmpeg::Error> {
    let input = ictx
        .streams()
        .best(media::Type::Audio)
        .expect("could not find best audio stream");
    let context = ffmpeg::codec::context::Context::from_parameters(input.parameters())?;
    let mut decoder = context.decoder().audio()?;
    let codec = ffmpeg::encoder::find(octx.format().codec(path, media::Type::Audio))
        .expect("failed to find encoder")
        .audio()?;
    let global = octx
        .format()
        .flags()
        .contains(ffmpeg::format::flag::Flags::GLOBAL_HEADER);

    decoder.set_parameters(input.parameters())?;

    let mut output = octx.add_stream(codec)?;
    let context = ffmpeg::codec::context::Context::from_parameters(output.parameters())?;
    let mut encoder = context.encoder().audio()?;

    let channel_layout = codec
        .channel_layouts()
        .map(|cls| cls.best(decoder.channel_layout().channels()))
        .unwrap_or(ffmpeg::channel_layout::ChannelLayout::STEREO);

    if global {
        encoder.set_flags(ffmpeg::codec::flag::Flags::GLOBAL_HEADER);
    }

    encoder.set_rate(decoder.rate() as i32);
    encoder.set_channel_layout(channel_layout);
    #[cfg(not(feature = "ffmpeg_7_0"))]
    {
        encoder.set_channels(channel_layout.channels());
    }
    encoder.set_format(
        codec
            .formats()
            .expect("unknown supported formats")
            .next()
            .unwrap(),
    );
    encoder.set_bit_rate(decoder.bit_rate());
    encoder.set_max_bit_rate(decoder.max_bit_rate());

    encoder.set_time_base((1, decoder.rate() as i32));
    output.set_time_base((1, decoder.rate() as i32));

    let encoder = encoder.open_as(codec)?;
    output.set_parameters(&encoder);

    let filter = filter(filter_spec, &decoder, &encoder)?;

    let in_time_base = decoder.time_base();
    let out_time_base = output.time_base();

    Ok(Transcoder {
        stream: input.index(),
        filter,
        decoder,
        encoder,
        in_time_base,
        out_time_base,
    })
}
source

pub fn channel_layout(&self) -> ChannelLayout

Examples found in repository?
examples/transcode-audio.rs (line 31)
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fn filter(
    spec: &str,
    decoder: &codec::decoder::Audio,
    encoder: &codec::encoder::Audio,
) -> Result<filter::Graph, ffmpeg::Error> {
    let mut filter = filter::Graph::new();

    let args = format!(
        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
        decoder.time_base(),
        decoder.rate(),
        decoder.format().name(),
        decoder.channel_layout().bits()
    );

    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;

    {
        let mut out = filter.get("out").unwrap();

        out.set_sample_format(encoder.format());
        out.set_channel_layout(encoder.channel_layout());
        out.set_sample_rate(encoder.rate());
    }

    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
    filter.validate()?;

    println!("{}", filter.dump());

    if let Some(codec) = encoder.codec() {
        if !codec
            .capabilities()
            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
        {
            filter
                .get("out")
                .unwrap()
                .sink()
                .set_frame_size(encoder.frame_size());
        }
    }

    Ok(filter)
}
source

pub fn set_channels(&mut self, value: i32)

Examples found in repository?
examples/transcode-audio.rs (line 104)
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fn transcoder<P: AsRef<Path> + ?Sized>(
    ictx: &mut format::context::Input,
    octx: &mut format::context::Output,
    path: &P,
    filter_spec: &str,
) -> Result<Transcoder, ffmpeg::Error> {
    let input = ictx
        .streams()
        .best(media::Type::Audio)
        .expect("could not find best audio stream");
    let context = ffmpeg::codec::context::Context::from_parameters(input.parameters())?;
    let mut decoder = context.decoder().audio()?;
    let codec = ffmpeg::encoder::find(octx.format().codec(path, media::Type::Audio))
        .expect("failed to find encoder")
        .audio()?;
    let global = octx
        .format()
        .flags()
        .contains(ffmpeg::format::flag::Flags::GLOBAL_HEADER);

    decoder.set_parameters(input.parameters())?;

    let mut output = octx.add_stream(codec)?;
    let context = ffmpeg::codec::context::Context::from_parameters(output.parameters())?;
    let mut encoder = context.encoder().audio()?;

    let channel_layout = codec
        .channel_layouts()
        .map(|cls| cls.best(decoder.channel_layout().channels()))
        .unwrap_or(ffmpeg::channel_layout::ChannelLayout::STEREO);

    if global {
        encoder.set_flags(ffmpeg::codec::flag::Flags::GLOBAL_HEADER);
    }

    encoder.set_rate(decoder.rate() as i32);
    encoder.set_channel_layout(channel_layout);
    #[cfg(not(feature = "ffmpeg_7_0"))]
    {
        encoder.set_channels(channel_layout.channels());
    }
    encoder.set_format(
        codec
            .formats()
            .expect("unknown supported formats")
            .next()
            .unwrap(),
    );
    encoder.set_bit_rate(decoder.bit_rate());
    encoder.set_max_bit_rate(decoder.max_bit_rate());

    encoder.set_time_base((1, decoder.rate() as i32));
    output.set_time_base((1, decoder.rate() as i32));

    let encoder = encoder.open_as(codec)?;
    output.set_parameters(&encoder);

    let filter = filter(filter_spec, &decoder, &encoder)?;

    let in_time_base = decoder.time_base();
    let out_time_base = output.time_base();

    Ok(Transcoder {
        stream: input.index(),
        filter,
        decoder,
        encoder,
        in_time_base,
        out_time_base,
    })
}
source

pub fn channels(&self) -> u16

Methods from Deref<Target = Super>§

source

pub fn send_frame(&mut self, frame: &Frame) -> Result<(), Error>

Examples found in repository?
examples/transcode-x264.rs (line 119)
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    fn send_frame_to_encoder(&mut self, frame: &frame::Video) {
        self.encoder.send_frame(frame).unwrap();
    }
More examples
Hide additional examples
examples/transcode-audio.rs (line 139)
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    fn send_frame_to_encoder(&mut self, frame: &ffmpeg::Frame) {
        self.encoder.send_frame(frame).unwrap();
    }
source

pub fn send_eof(&mut self) -> Result<(), Error>

Sends a NULL packet to the encoder to signal end of stream and enter draining mode.

Examples found in repository?
examples/transcode-audio.rs (line 143)
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    fn send_eof_to_encoder(&mut self) {
        self.encoder.send_eof().unwrap();
    }
More examples
Hide additional examples
examples/transcode-x264.rs (line 123)
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    fn send_eof_to_encoder(&mut self) {
        self.encoder.send_eof().unwrap();
    }
source

pub fn receive_packet<P: Mut>(&mut self, packet: &mut P) -> Result<(), Error>

Examples found in repository?
examples/transcode-audio.rs (line 148)
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    fn receive_and_process_encoded_packets(&mut self, octx: &mut format::context::Output) {
        let mut encoded = ffmpeg::Packet::empty();
        while self.encoder.receive_packet(&mut encoded).is_ok() {
            encoded.set_stream(0);
            encoded.rescale_ts(self.in_time_base, self.out_time_base);
            encoded.write_interleaved(octx).unwrap();
        }
    }
More examples
Hide additional examples
examples/transcode-x264.rs (line 132)
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    fn receive_and_process_encoded_packets(
        &mut self,
        octx: &mut format::context::Output,
        ost_time_base: Rational,
    ) {
        let mut encoded = Packet::empty();
        while self.encoder.receive_packet(&mut encoded).is_ok() {
            encoded.set_stream(self.ost_index);
            encoded.rescale_ts(self.input_time_base, ost_time_base);
            encoded.write_interleaved(octx).unwrap();
        }
    }
source

pub fn set_bit_rate(&mut self, value: usize)

Examples found in repository?
examples/transcode-audio.rs (line 113)
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fn transcoder<P: AsRef<Path> + ?Sized>(
    ictx: &mut format::context::Input,
    octx: &mut format::context::Output,
    path: &P,
    filter_spec: &str,
) -> Result<Transcoder, ffmpeg::Error> {
    let input = ictx
        .streams()
        .best(media::Type::Audio)
        .expect("could not find best audio stream");
    let context = ffmpeg::codec::context::Context::from_parameters(input.parameters())?;
    let mut decoder = context.decoder().audio()?;
    let codec = ffmpeg::encoder::find(octx.format().codec(path, media::Type::Audio))
        .expect("failed to find encoder")
        .audio()?;
    let global = octx
        .format()
        .flags()
        .contains(ffmpeg::format::flag::Flags::GLOBAL_HEADER);

    decoder.set_parameters(input.parameters())?;

    let mut output = octx.add_stream(codec)?;
    let context = ffmpeg::codec::context::Context::from_parameters(output.parameters())?;
    let mut encoder = context.encoder().audio()?;

    let channel_layout = codec
        .channel_layouts()
        .map(|cls| cls.best(decoder.channel_layout().channels()))
        .unwrap_or(ffmpeg::channel_layout::ChannelLayout::STEREO);

    if global {
        encoder.set_flags(ffmpeg::codec::flag::Flags::GLOBAL_HEADER);
    }

    encoder.set_rate(decoder.rate() as i32);
    encoder.set_channel_layout(channel_layout);
    #[cfg(not(feature = "ffmpeg_7_0"))]
    {
        encoder.set_channels(channel_layout.channels());
    }
    encoder.set_format(
        codec
            .formats()
            .expect("unknown supported formats")
            .next()
            .unwrap(),
    );
    encoder.set_bit_rate(decoder.bit_rate());
    encoder.set_max_bit_rate(decoder.max_bit_rate());

    encoder.set_time_base((1, decoder.rate() as i32));
    output.set_time_base((1, decoder.rate() as i32));

    let encoder = encoder.open_as(codec)?;
    output.set_parameters(&encoder);

    let filter = filter(filter_spec, &decoder, &encoder)?;

    let in_time_base = decoder.time_base();
    let out_time_base = output.time_base();

    Ok(Transcoder {
        stream: input.index(),
        filter,
        decoder,
        encoder,
        in_time_base,
        out_time_base,
    })
}
source

pub fn set_max_bit_rate(&mut self, value: usize)

Examples found in repository?
examples/transcode-audio.rs (line 114)
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fn transcoder<P: AsRef<Path> + ?Sized>(
    ictx: &mut format::context::Input,
    octx: &mut format::context::Output,
    path: &P,
    filter_spec: &str,
) -> Result<Transcoder, ffmpeg::Error> {
    let input = ictx
        .streams()
        .best(media::Type::Audio)
        .expect("could not find best audio stream");
    let context = ffmpeg::codec::context::Context::from_parameters(input.parameters())?;
    let mut decoder = context.decoder().audio()?;
    let codec = ffmpeg::encoder::find(octx.format().codec(path, media::Type::Audio))
        .expect("failed to find encoder")
        .audio()?;
    let global = octx
        .format()
        .flags()
        .contains(ffmpeg::format::flag::Flags::GLOBAL_HEADER);

    decoder.set_parameters(input.parameters())?;

    let mut output = octx.add_stream(codec)?;
    let context = ffmpeg::codec::context::Context::from_parameters(output.parameters())?;
    let mut encoder = context.encoder().audio()?;

    let channel_layout = codec
        .channel_layouts()
        .map(|cls| cls.best(decoder.channel_layout().channels()))
        .unwrap_or(ffmpeg::channel_layout::ChannelLayout::STEREO);

    if global {
        encoder.set_flags(ffmpeg::codec::flag::Flags::GLOBAL_HEADER);
    }

    encoder.set_rate(decoder.rate() as i32);
    encoder.set_channel_layout(channel_layout);
    #[cfg(not(feature = "ffmpeg_7_0"))]
    {
        encoder.set_channels(channel_layout.channels());
    }
    encoder.set_format(
        codec
            .formats()
            .expect("unknown supported formats")
            .next()
            .unwrap(),
    );
    encoder.set_bit_rate(decoder.bit_rate());
    encoder.set_max_bit_rate(decoder.max_bit_rate());

    encoder.set_time_base((1, decoder.rate() as i32));
    output.set_time_base((1, decoder.rate() as i32));

    let encoder = encoder.open_as(codec)?;
    output.set_parameters(&encoder);

    let filter = filter(filter_spec, &decoder, &encoder)?;

    let in_time_base = decoder.time_base();
    let out_time_base = output.time_base();

    Ok(Transcoder {
        stream: input.index(),
        filter,
        decoder,
        encoder,
        in_time_base,
        out_time_base,
    })
}
source

pub fn set_tolerance(&mut self, value: usize)

source

pub fn set_quality(&mut self, value: usize)

source

pub fn set_compression(&mut self, value: Option<usize>)

Methods from Deref<Target = Context>§

source

pub unsafe fn as_ptr(&self) -> *const AVCodecContext

source

pub unsafe fn as_mut_ptr(&mut self) -> *mut AVCodecContext

source

pub fn codec(&self) -> Option<Codec>

Examples found in repository?
examples/transcode-audio.rs (line 40)
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fn filter(
    spec: &str,
    decoder: &codec::decoder::Audio,
    encoder: &codec::encoder::Audio,
) -> Result<filter::Graph, ffmpeg::Error> {
    let mut filter = filter::Graph::new();

    let args = format!(
        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
        decoder.time_base(),
        decoder.rate(),
        decoder.format().name(),
        decoder.channel_layout().bits()
    );

    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;

    {
        let mut out = filter.get("out").unwrap();

        out.set_sample_format(encoder.format());
        out.set_channel_layout(encoder.channel_layout());
        out.set_sample_rate(encoder.rate());
    }

    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
    filter.validate()?;

    println!("{}", filter.dump());

    if let Some(codec) = encoder.codec() {
        if !codec
            .capabilities()
            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
        {
            filter
                .get("out")
                .unwrap()
                .sink()
                .set_frame_size(encoder.frame_size());
        }
    }

    Ok(filter)
}
source

pub fn medium(&self) -> Type

Examples found in repository?
examples/metadata.rs (line 46)
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fn main() -> Result<(), ffmpeg::Error> {
    ffmpeg::init().unwrap();

    match ffmpeg::format::input(&env::args().nth(1).expect("missing file")) {
        Ok(context) => {
            for (k, v) in context.metadata().iter() {
                println!("{}: {}", k, v);
            }

            if let Some(stream) = context.streams().best(ffmpeg::media::Type::Video) {
                println!("Best video stream index: {}", stream.index());
            }

            if let Some(stream) = context.streams().best(ffmpeg::media::Type::Audio) {
                println!("Best audio stream index: {}", stream.index());
            }

            if let Some(stream) = context.streams().best(ffmpeg::media::Type::Subtitle) {
                println!("Best subtitle stream index: {}", stream.index());
            }

            println!(
                "duration (seconds): {:.2}",
                context.duration() as f64 / f64::from(ffmpeg::ffi::AV_TIME_BASE)
            );

            for stream in context.streams() {
                println!("stream index {}:", stream.index());
                println!("\ttime_base: {}", stream.time_base());
                println!("\tstart_time: {}", stream.start_time());
                println!("\tduration (stream timebase): {}", stream.duration());
                println!(
                    "\tduration (seconds): {:.2}",
                    stream.duration() as f64 * f64::from(stream.time_base())
                );
                println!("\tframes: {}", stream.frames());
                println!("\tdisposition: {:?}", stream.disposition());
                println!("\tdiscard: {:?}", stream.discard());
                println!("\trate: {}", stream.rate());

                let codec = ffmpeg::codec::context::Context::from_parameters(stream.parameters())?;
                println!("\tmedium: {:?}", codec.medium());
                println!("\tid: {:?}", codec.id());

                if codec.medium() == ffmpeg::media::Type::Video {
                    if let Ok(video) = codec.decoder().video() {
                        println!("\tbit_rate: {}", video.bit_rate());
                        println!("\tmax_rate: {}", video.max_bit_rate());
                        println!("\tdelay: {}", video.delay());
                        println!("\tvideo.width: {}", video.width());
                        println!("\tvideo.height: {}", video.height());
                        println!("\tvideo.format: {:?}", video.format());
                        println!("\tvideo.has_b_frames: {}", video.has_b_frames());
                        println!("\tvideo.aspect_ratio: {}", video.aspect_ratio());
                        println!("\tvideo.color_space: {:?}", video.color_space());
                        println!("\tvideo.color_range: {:?}", video.color_range());
                        println!("\tvideo.color_primaries: {:?}", video.color_primaries());
                        println!(
                            "\tvideo.color_transfer_characteristic: {:?}",
                            video.color_transfer_characteristic()
                        );
                        println!("\tvideo.chroma_location: {:?}", video.chroma_location());
                        println!("\tvideo.references: {}", video.references());
                        println!("\tvideo.intra_dc_precision: {}", video.intra_dc_precision());
                    }
                } else if codec.medium() == ffmpeg::media::Type::Audio {
                    if let Ok(audio) = codec.decoder().audio() {
                        println!("\tbit_rate: {}", audio.bit_rate());
                        println!("\tmax_rate: {}", audio.max_bit_rate());
                        println!("\tdelay: {}", audio.delay());
                        println!("\taudio.rate: {}", audio.rate());
                        println!("\taudio.channels: {}", audio.channels());
                        println!("\taudio.format: {:?}", audio.format());
                        println!("\taudio.frames: {}", audio.frames());
                        println!("\taudio.align: {}", audio.align());
                        println!("\taudio.channel_layout: {:?}", audio.channel_layout());
                    }
                }
            }
        }

        Err(error) => println!("error: {}", error),
    }
    Ok(())
}
source

pub fn set_flags(&mut self, value: Flags)

Examples found in repository?
examples/transcode-x264.rs (line 71)
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    fn new(
        ist: &format::stream::Stream,
        octx: &mut format::context::Output,
        ost_index: usize,
        x264_opts: Dictionary,
        enable_logging: bool,
    ) -> Result<Self, ffmpeg::Error> {
        let global_header = octx.format().flags().contains(format::Flags::GLOBAL_HEADER);
        let decoder = ffmpeg::codec::context::Context::from_parameters(ist.parameters())?
            .decoder()
            .video()?;

        let codec = encoder::find(codec::Id::H264);
        let mut ost = octx.add_stream(codec)?;

        let mut encoder =
            codec::context::Context::new_with_codec(codec.ok_or(ffmpeg::Error::InvalidData)?)
                .encoder()
                .video()?;
        ost.set_parameters(&encoder);
        encoder.set_height(decoder.height());
        encoder.set_width(decoder.width());
        encoder.set_aspect_ratio(decoder.aspect_ratio());
        encoder.set_format(decoder.format());
        encoder.set_frame_rate(decoder.frame_rate());
        encoder.set_time_base(ist.time_base());

        if global_header {
            encoder.set_flags(codec::Flags::GLOBAL_HEADER);
        }

        let opened_encoder = encoder
            .open_with(x264_opts)
            .expect("error opening x264 with supplied settings");
        ost.set_parameters(&opened_encoder);
        Ok(Self {
            ost_index,
            decoder,
            input_time_base: ist.time_base(),
            encoder: opened_encoder,
            logging_enabled: enable_logging,
            frame_count: 0,
            last_log_frame_count: 0,
            starting_time: Instant::now(),
            last_log_time: Instant::now(),
        })
    }
More examples
Hide additional examples
examples/transcode-audio.rs (line 97)
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fn transcoder<P: AsRef<Path> + ?Sized>(
    ictx: &mut format::context::Input,
    octx: &mut format::context::Output,
    path: &P,
    filter_spec: &str,
) -> Result<Transcoder, ffmpeg::Error> {
    let input = ictx
        .streams()
        .best(media::Type::Audio)
        .expect("could not find best audio stream");
    let context = ffmpeg::codec::context::Context::from_parameters(input.parameters())?;
    let mut decoder = context.decoder().audio()?;
    let codec = ffmpeg::encoder::find(octx.format().codec(path, media::Type::Audio))
        .expect("failed to find encoder")
        .audio()?;
    let global = octx
        .format()
        .flags()
        .contains(ffmpeg::format::flag::Flags::GLOBAL_HEADER);

    decoder.set_parameters(input.parameters())?;

    let mut output = octx.add_stream(codec)?;
    let context = ffmpeg::codec::context::Context::from_parameters(output.parameters())?;
    let mut encoder = context.encoder().audio()?;

    let channel_layout = codec
        .channel_layouts()
        .map(|cls| cls.best(decoder.channel_layout().channels()))
        .unwrap_or(ffmpeg::channel_layout::ChannelLayout::STEREO);

    if global {
        encoder.set_flags(ffmpeg::codec::flag::Flags::GLOBAL_HEADER);
    }

    encoder.set_rate(decoder.rate() as i32);
    encoder.set_channel_layout(channel_layout);
    #[cfg(not(feature = "ffmpeg_7_0"))]
    {
        encoder.set_channels(channel_layout.channels());
    }
    encoder.set_format(
        codec
            .formats()
            .expect("unknown supported formats")
            .next()
            .unwrap(),
    );
    encoder.set_bit_rate(decoder.bit_rate());
    encoder.set_max_bit_rate(decoder.max_bit_rate());

    encoder.set_time_base((1, decoder.rate() as i32));
    output.set_time_base((1, decoder.rate() as i32));

    let encoder = encoder.open_as(codec)?;
    output.set_parameters(&encoder);

    let filter = filter(filter_spec, &decoder, &encoder)?;

    let in_time_base = decoder.time_base();
    let out_time_base = output.time_base();

    Ok(Transcoder {
        stream: input.index(),
        filter,
        decoder,
        encoder,
        in_time_base,
        out_time_base,
    })
}
source

pub fn id(&self) -> Id

Examples found in repository?
examples/metadata.rs (line 47)
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fn main() -> Result<(), ffmpeg::Error> {
    ffmpeg::init().unwrap();

    match ffmpeg::format::input(&env::args().nth(1).expect("missing file")) {
        Ok(context) => {
            for (k, v) in context.metadata().iter() {
                println!("{}: {}", k, v);
            }

            if let Some(stream) = context.streams().best(ffmpeg::media::Type::Video) {
                println!("Best video stream index: {}", stream.index());
            }

            if let Some(stream) = context.streams().best(ffmpeg::media::Type::Audio) {
                println!("Best audio stream index: {}", stream.index());
            }

            if let Some(stream) = context.streams().best(ffmpeg::media::Type::Subtitle) {
                println!("Best subtitle stream index: {}", stream.index());
            }

            println!(
                "duration (seconds): {:.2}",
                context.duration() as f64 / f64::from(ffmpeg::ffi::AV_TIME_BASE)
            );

            for stream in context.streams() {
                println!("stream index {}:", stream.index());
                println!("\ttime_base: {}", stream.time_base());
                println!("\tstart_time: {}", stream.start_time());
                println!("\tduration (stream timebase): {}", stream.duration());
                println!(
                    "\tduration (seconds): {:.2}",
                    stream.duration() as f64 * f64::from(stream.time_base())
                );
                println!("\tframes: {}", stream.frames());
                println!("\tdisposition: {:?}", stream.disposition());
                println!("\tdiscard: {:?}", stream.discard());
                println!("\trate: {}", stream.rate());

                let codec = ffmpeg::codec::context::Context::from_parameters(stream.parameters())?;
                println!("\tmedium: {:?}", codec.medium());
                println!("\tid: {:?}", codec.id());

                if codec.medium() == ffmpeg::media::Type::Video {
                    if let Ok(video) = codec.decoder().video() {
                        println!("\tbit_rate: {}", video.bit_rate());
                        println!("\tmax_rate: {}", video.max_bit_rate());
                        println!("\tdelay: {}", video.delay());
                        println!("\tvideo.width: {}", video.width());
                        println!("\tvideo.height: {}", video.height());
                        println!("\tvideo.format: {:?}", video.format());
                        println!("\tvideo.has_b_frames: {}", video.has_b_frames());
                        println!("\tvideo.aspect_ratio: {}", video.aspect_ratio());
                        println!("\tvideo.color_space: {:?}", video.color_space());
                        println!("\tvideo.color_range: {:?}", video.color_range());
                        println!("\tvideo.color_primaries: {:?}", video.color_primaries());
                        println!(
                            "\tvideo.color_transfer_characteristic: {:?}",
                            video.color_transfer_characteristic()
                        );
                        println!("\tvideo.chroma_location: {:?}", video.chroma_location());
                        println!("\tvideo.references: {}", video.references());
                        println!("\tvideo.intra_dc_precision: {}", video.intra_dc_precision());
                    }
                } else if codec.medium() == ffmpeg::media::Type::Audio {
                    if let Ok(audio) = codec.decoder().audio() {
                        println!("\tbit_rate: {}", audio.bit_rate());
                        println!("\tmax_rate: {}", audio.max_bit_rate());
                        println!("\tdelay: {}", audio.delay());
                        println!("\taudio.rate: {}", audio.rate());
                        println!("\taudio.channels: {}", audio.channels());
                        println!("\taudio.format: {:?}", audio.format());
                        println!("\taudio.frames: {}", audio.frames());
                        println!("\taudio.align: {}", audio.align());
                        println!("\taudio.channel_layout: {:?}", audio.channel_layout());
                    }
                }
            }
        }

        Err(error) => println!("error: {}", error),
    }
    Ok(())
}
source

pub fn compliance(&mut self, value: Compliance)

source

pub fn debug(&mut self, value: Debug)

source

pub fn set_threading(&mut self, config: Config)

source

pub fn threading(&self) -> Config

source

pub fn set_parameters<P: Into<Parameters>>( &mut self, parameters: P, ) -> Result<(), Error>

Examples found in repository?
examples/transcode-audio.rs (line 85)
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fn transcoder<P: AsRef<Path> + ?Sized>(
    ictx: &mut format::context::Input,
    octx: &mut format::context::Output,
    path: &P,
    filter_spec: &str,
) -> Result<Transcoder, ffmpeg::Error> {
    let input = ictx
        .streams()
        .best(media::Type::Audio)
        .expect("could not find best audio stream");
    let context = ffmpeg::codec::context::Context::from_parameters(input.parameters())?;
    let mut decoder = context.decoder().audio()?;
    let codec = ffmpeg::encoder::find(octx.format().codec(path, media::Type::Audio))
        .expect("failed to find encoder")
        .audio()?;
    let global = octx
        .format()
        .flags()
        .contains(ffmpeg::format::flag::Flags::GLOBAL_HEADER);

    decoder.set_parameters(input.parameters())?;

    let mut output = octx.add_stream(codec)?;
    let context = ffmpeg::codec::context::Context::from_parameters(output.parameters())?;
    let mut encoder = context.encoder().audio()?;

    let channel_layout = codec
        .channel_layouts()
        .map(|cls| cls.best(decoder.channel_layout().channels()))
        .unwrap_or(ffmpeg::channel_layout::ChannelLayout::STEREO);

    if global {
        encoder.set_flags(ffmpeg::codec::flag::Flags::GLOBAL_HEADER);
    }

    encoder.set_rate(decoder.rate() as i32);
    encoder.set_channel_layout(channel_layout);
    #[cfg(not(feature = "ffmpeg_7_0"))]
    {
        encoder.set_channels(channel_layout.channels());
    }
    encoder.set_format(
        codec
            .formats()
            .expect("unknown supported formats")
            .next()
            .unwrap(),
    );
    encoder.set_bit_rate(decoder.bit_rate());
    encoder.set_max_bit_rate(decoder.max_bit_rate());

    encoder.set_time_base((1, decoder.rate() as i32));
    output.set_time_base((1, decoder.rate() as i32));

    let encoder = encoder.open_as(codec)?;
    output.set_parameters(&encoder);

    let filter = filter(filter_spec, &decoder, &encoder)?;

    let in_time_base = decoder.time_base();
    let out_time_base = output.time_base();

    Ok(Transcoder {
        stream: input.index(),
        filter,
        decoder,
        encoder,
        in_time_base,
        out_time_base,
    })
}
source

pub fn time_base(&self) -> Rational

Examples found in repository?
examples/transcode-audio.rs (line 18)
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fn filter(
    spec: &str,
    decoder: &codec::decoder::Audio,
    encoder: &codec::encoder::Audio,
) -> Result<filter::Graph, ffmpeg::Error> {
    let mut filter = filter::Graph::new();

    let args = format!(
        "time_base={}:sample_rate={}:sample_fmt={}:channel_layout=0x{:x}",
        decoder.time_base(),
        decoder.rate(),
        decoder.format().name(),
        decoder.channel_layout().bits()
    );

    filter.add(&filter::find("abuffer").unwrap(), "in", &args)?;
    filter.add(&filter::find("abuffersink").unwrap(), "out", "")?;

    {
        let mut out = filter.get("out").unwrap();

        out.set_sample_format(encoder.format());
        out.set_channel_layout(encoder.channel_layout());
        out.set_sample_rate(encoder.rate());
    }

    filter.output("in", 0)?.input("out", 0)?.parse(spec)?;
    filter.validate()?;

    println!("{}", filter.dump());

    if let Some(codec) = encoder.codec() {
        if !codec
            .capabilities()
            .contains(ffmpeg::codec::capabilities::Capabilities::VARIABLE_FRAME_SIZE)
        {
            filter
                .get("out")
                .unwrap()
                .sink()
                .set_frame_size(encoder.frame_size());
        }
    }

    Ok(filter)
}

struct Transcoder {
    stream: usize,
    filter: filter::Graph,
    decoder: codec::decoder::Audio,
    encoder: codec::encoder::Audio,
    in_time_base: ffmpeg::Rational,
    out_time_base: ffmpeg::Rational,
}

fn transcoder<P: AsRef<Path> + ?Sized>(
    ictx: &mut format::context::Input,
    octx: &mut format::context::Output,
    path: &P,
    filter_spec: &str,
) -> Result<Transcoder, ffmpeg::Error> {
    let input = ictx
        .streams()
        .best(media::Type::Audio)
        .expect("could not find best audio stream");
    let context = ffmpeg::codec::context::Context::from_parameters(input.parameters())?;
    let mut decoder = context.decoder().audio()?;
    let codec = ffmpeg::encoder::find(octx.format().codec(path, media::Type::Audio))
        .expect("failed to find encoder")
        .audio()?;
    let global = octx
        .format()
        .flags()
        .contains(ffmpeg::format::flag::Flags::GLOBAL_HEADER);

    decoder.set_parameters(input.parameters())?;

    let mut output = octx.add_stream(codec)?;
    let context = ffmpeg::codec::context::Context::from_parameters(output.parameters())?;
    let mut encoder = context.encoder().audio()?;

    let channel_layout = codec
        .channel_layouts()
        .map(|cls| cls.best(decoder.channel_layout().channels()))
        .unwrap_or(ffmpeg::channel_layout::ChannelLayout::STEREO);

    if global {
        encoder.set_flags(ffmpeg::codec::flag::Flags::GLOBAL_HEADER);
    }

    encoder.set_rate(decoder.rate() as i32);
    encoder.set_channel_layout(channel_layout);
    #[cfg(not(feature = "ffmpeg_7_0"))]
    {
        encoder.set_channels(channel_layout.channels());
    }
    encoder.set_format(
        codec
            .formats()
            .expect("unknown supported formats")
            .next()
            .unwrap(),
    );
    encoder.set_bit_rate(decoder.bit_rate());
    encoder.set_max_bit_rate(decoder.max_bit_rate());

    encoder.set_time_base((1, decoder.rate() as i32));
    output.set_time_base((1, decoder.rate() as i32));

    let encoder = encoder.open_as(codec)?;
    output.set_parameters(&encoder);

    let filter = filter(filter_spec, &decoder, &encoder)?;

    let in_time_base = decoder.time_base();
    let out_time_base = output.time_base();

    Ok(Transcoder {
        stream: input.index(),
        filter,
        decoder,
        encoder,
        in_time_base,
        out_time_base,
    })
}
source

pub fn set_time_base<R: Into<Rational>>(&mut self, value: R)

Examples found in repository?
examples/transcode-x264.rs (line 68)
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    fn new(
        ist: &format::stream::Stream,
        octx: &mut format::context::Output,
        ost_index: usize,
        x264_opts: Dictionary,
        enable_logging: bool,
    ) -> Result<Self, ffmpeg::Error> {
        let global_header = octx.format().flags().contains(format::Flags::GLOBAL_HEADER);
        let decoder = ffmpeg::codec::context::Context::from_parameters(ist.parameters())?
            .decoder()
            .video()?;

        let codec = encoder::find(codec::Id::H264);
        let mut ost = octx.add_stream(codec)?;

        let mut encoder =
            codec::context::Context::new_with_codec(codec.ok_or(ffmpeg::Error::InvalidData)?)
                .encoder()
                .video()?;
        ost.set_parameters(&encoder);
        encoder.set_height(decoder.height());
        encoder.set_width(decoder.width());
        encoder.set_aspect_ratio(decoder.aspect_ratio());
        encoder.set_format(decoder.format());
        encoder.set_frame_rate(decoder.frame_rate());
        encoder.set_time_base(ist.time_base());

        if global_header {
            encoder.set_flags(codec::Flags::GLOBAL_HEADER);
        }

        let opened_encoder = encoder
            .open_with(x264_opts)
            .expect("error opening x264 with supplied settings");
        ost.set_parameters(&opened_encoder);
        Ok(Self {
            ost_index,
            decoder,
            input_time_base: ist.time_base(),
            encoder: opened_encoder,
            logging_enabled: enable_logging,
            frame_count: 0,
            last_log_frame_count: 0,
            starting_time: Instant::now(),
            last_log_time: Instant::now(),
        })
    }
More examples
Hide additional examples
examples/transcode-audio.rs (line 116)
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fn transcoder<P: AsRef<Path> + ?Sized>(
    ictx: &mut format::context::Input,
    octx: &mut format::context::Output,
    path: &P,
    filter_spec: &str,
) -> Result<Transcoder, ffmpeg::Error> {
    let input = ictx
        .streams()
        .best(media::Type::Audio)
        .expect("could not find best audio stream");
    let context = ffmpeg::codec::context::Context::from_parameters(input.parameters())?;
    let mut decoder = context.decoder().audio()?;
    let codec = ffmpeg::encoder::find(octx.format().codec(path, media::Type::Audio))
        .expect("failed to find encoder")
        .audio()?;
    let global = octx
        .format()
        .flags()
        .contains(ffmpeg::format::flag::Flags::GLOBAL_HEADER);

    decoder.set_parameters(input.parameters())?;

    let mut output = octx.add_stream(codec)?;
    let context = ffmpeg::codec::context::Context::from_parameters(output.parameters())?;
    let mut encoder = context.encoder().audio()?;

    let channel_layout = codec
        .channel_layouts()
        .map(|cls| cls.best(decoder.channel_layout().channels()))
        .unwrap_or(ffmpeg::channel_layout::ChannelLayout::STEREO);

    if global {
        encoder.set_flags(ffmpeg::codec::flag::Flags::GLOBAL_HEADER);
    }

    encoder.set_rate(decoder.rate() as i32);
    encoder.set_channel_layout(channel_layout);
    #[cfg(not(feature = "ffmpeg_7_0"))]
    {
        encoder.set_channels(channel_layout.channels());
    }
    encoder.set_format(
        codec
            .formats()
            .expect("unknown supported formats")
            .next()
            .unwrap(),
    );
    encoder.set_bit_rate(decoder.bit_rate());
    encoder.set_max_bit_rate(decoder.max_bit_rate());

    encoder.set_time_base((1, decoder.rate() as i32));
    output.set_time_base((1, decoder.rate() as i32));

    let encoder = encoder.open_as(codec)?;
    output.set_parameters(&encoder);

    let filter = filter(filter_spec, &decoder, &encoder)?;

    let in_time_base = decoder.time_base();
    let out_time_base = output.time_base();

    Ok(Transcoder {
        stream: input.index(),
        filter,
        decoder,
        encoder,
        in_time_base,
        out_time_base,
    })
}
source

pub fn frame_rate(&self) -> Rational

source

pub fn set_frame_rate<R: Into<Rational>>(&mut self, value: Option<R>)

Examples found in repository?
examples/transcode-x264.rs (line 67)
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    fn new(
        ist: &format::stream::Stream,
        octx: &mut format::context::Output,
        ost_index: usize,
        x264_opts: Dictionary,
        enable_logging: bool,
    ) -> Result<Self, ffmpeg::Error> {
        let global_header = octx.format().flags().contains(format::Flags::GLOBAL_HEADER);
        let decoder = ffmpeg::codec::context::Context::from_parameters(ist.parameters())?
            .decoder()
            .video()?;

        let codec = encoder::find(codec::Id::H264);
        let mut ost = octx.add_stream(codec)?;

        let mut encoder =
            codec::context::Context::new_with_codec(codec.ok_or(ffmpeg::Error::InvalidData)?)
                .encoder()
                .video()?;
        ost.set_parameters(&encoder);
        encoder.set_height(decoder.height());
        encoder.set_width(decoder.width());
        encoder.set_aspect_ratio(decoder.aspect_ratio());
        encoder.set_format(decoder.format());
        encoder.set_frame_rate(decoder.frame_rate());
        encoder.set_time_base(ist.time_base());

        if global_header {
            encoder.set_flags(codec::Flags::GLOBAL_HEADER);
        }

        let opened_encoder = encoder
            .open_with(x264_opts)
            .expect("error opening x264 with supplied settings");
        ost.set_parameters(&opened_encoder);
        Ok(Self {
            ost_index,
            decoder,
            input_time_base: ist.time_base(),
            encoder: opened_encoder,
            logging_enabled: enable_logging,
            frame_count: 0,
            last_log_frame_count: 0,
            starting_time: Instant::now(),
            last_log_time: Instant::now(),
        })
    }

Trait Implementations§

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impl AsMut<Context> for Encoder

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fn as_mut(&mut self) -> &mut Context

Converts this type into a mutable reference of the (usually inferred) input type.
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impl AsRef<Context> for Encoder

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fn as_ref(&self) -> &Context

Converts this type into a shared reference of the (usually inferred) input type.
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impl Deref for Encoder

§

type Target = Audio

The resulting type after dereferencing.
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fn deref(&self) -> &<Self as Deref>::Target

Dereferences the value.
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impl DerefMut for Encoder

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fn deref_mut(&mut self) -> &mut <Self as Deref>::Target

Mutably dereferences the value.

Auto Trait Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.