Struct RenditionSpec 

pub struct RenditionSpec {
    pub name: String,
    pub width: u32,
    pub height: u32,
    pub video_bitrate_kbps: u32,
    pub audio_bitrate_kbps: u32,
}

One rendition in an ABR ladder. Carries the target geometry + bitrates a downstream encoder uses to produce output fragments.

Session 104 A captures only the minimum set every software + hardware encoder consumes. Session 105 B extends this with codec-specific knobs (x264 profile / tune / keyint, NVENC quality preset, VideoToolbox pixel format) layered on rather than replacing these fields, so existing consumers stay source-compatible.

Fields

name: String

Short human-readable identifier ("720p" / "480p" / "240p"). Used as:

• The rendition suffix on the output broadcast name (<source>/<name>).
• A Prometheus metric label (lvqr_transcode_fragments_total{rendition="720p"}).
• The HLS master-playlist NAME= attribute (landed in session 106 C).

Pick something short, lowercase, no slashes. Validation is the operator’s responsibility for now; session 106 C’s CLI flag will enforce the character set.

width: u32

Target frame width in pixels. Downstream encoders use this to configure the videoscale element (or the hardware encoder’s equivalent).

height: u32

Target frame height in pixels.

video_bitrate_kbps: u32

Target video bitrate in kilobits / second. Upstream to the encoder’s bitrate property. Typical 720p h264 lands at 2-3 Mb/s; 480p at 1-1.5 Mb/s; 240p at 300-500 kb/s.

audio_bitrate_kbps: u32

Target audio bitrate in kilobits / second. Upstream to the audio encoder (AAC in 105 B) or passed through when the rendition reuses the source audio track. 96-128 kb/s at 48 kHz stereo is the typical range.

Implementations

impl RenditionSpec

pub fn new( name: impl Into<String>, width: u32, height: u32, video_bitrate_kbps: u32, audio_bitrate_kbps: u32, ) -> Self

Construct a custom rendition with the supplied fields.

pub fn preset_720p() -> Self

720p preset: 1280x720 at 2.5 Mb/s video + 128 kb/s audio. Matches the tracking/TIER_4_PLAN.md section 4.6 default.

pub fn preset_480p() -> Self

480p preset: 854x480 at 1.2 Mb/s video + 96 kb/s audio.

pub fn preset_240p() -> Self

240p preset: 426x240 at 400 kb/s video + 64 kb/s audio.

pub fn default_ladder() -> Vec<Self>

Default 3-rung LVQR ladder, ordered highest-to-lowest so operators reading logs or admin output see the ladder’s top rung first. HLS master-playlist composition in session 106 C sorts independently by BANDWIDTH.

Trait Implementations

impl Clone for RenditionSpec

fn clone(&self) -> RenditionSpec

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RenditionSpec

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for RenditionSpec

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for RenditionSpec

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for RenditionSpec

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for RenditionSpec

impl StructuralPartialEq for RenditionSpec