Enum QualityPreset 

pub enum QualityPreset {
    Fast,
    Balanced,
    Max,
}

Speed/quality trade-off, mapped to the encoder preset.

Variants

Fast

Balanced

Max

Implementations

impl QualityPreset

pub fn encoder_preset(self) -> &'static str

x264/x265 -preset value.

pub fn speed_flags(self, encoder: &str) -> (&'static str, &'static str)

The speed/quality knob for a specific encoder, as (flag, value).

Encoders disagree on both the flag and its scale: x264/x265 take named -presets, SVT-AV1 takes a numeric -preset (0 slowest … 13 fastest), and libaom takes -cpu-used. Passing an x264 preset name to SVT-AV1 is a hard ffmpeg error, so the argv builder must ask per encoder.

pub fn default_hw_quality(self, codec: VideoCodec) -> Option<u8>

Default quality-mode CRF for a codec. x265 needs a higher CRF than x264 for comparable quality, and AV1 higher still, so the numbers are codec-specific. These defaults aim for roughly VMAF ~93 (visually near-transparent) on typical content. VideoToolbox constant quality (-q:v, 1–100) giving about the same VMAF as Self::default_crf with the software encoder — calibrated on a 4K iPhone clip. Apple H.264 lands near x264’s size; Apple HEVC is ~50 % larger than x265 at that quality. None: no hardware encoder (AV1).

pub fn default_crf(self, codec: VideoCodec) -> u8

Trait Implementations

impl Clone for QualityPreset

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for QualityPreset

impl Debug for QualityPreset

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for QualityPreset

impl PartialEq for QualityPreset

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for QualityPreset