y4m 0.8.0

YUV4MPEG2 (.y4m) Encoder/Decoder.

y4m Build Status crates.io

YUV4MPEG2 (.y4m) Encoder/Decoder. Format specification.


Simple stream copying:

extern crate y4m;
use std::io;

let mut infh = io::stdin();
let mut outfh = io::stdout();
let mut dec = y4m::decode(&mut infh).unwrap();
let mut enc = y4m::encode(dec.get_width(), dec.get_height(), dec.get_framerate())
    .write_header(&mut outfh)
loop {
    match dec.read_frame() {
        Ok(frame) => if enc.write_frame(&frame).is_err() { break },
        _ => break,

See API documentation for overview of all available methods. See also this example on how to resize input y4m into grayscale y4m of different resolution:

cargo build --release --example resize
ffmpeg -i in.mkv -f yuv4mpegpipe - | target/release/examples/resize - 640x360 - | mpv -


Library is licensed under MIT.