Enum ChunkSeamMode 

pub enum ChunkSeamMode {
    Parallel,
    ParallelConstQp,
    Serial,
}

How the multi-GPU single-file path keeps quality consistent across the chunk seams it stitches into one continuous video.

Only relevant when more than one GPU encodes a single file (the AllGpus / Family policies on a multi-GPU host); single-GPU hosts, SingleGpu, and HLS (whose segments are independent by design) are unaffected. AMD (AMF) and Intel (QSV) chunks are already constant-QP, so their seams are quality-flat — this chiefly governs NVENC, which otherwise runs VBR per chunk and can leave a mild quality step at the ~2 s boundaries.

Variants

Parallel

Default. Chunk across GPUs for throughput; each chunk uses its encoder’s normal rate control (VBR on NVENC). Fastest; NVENC may show mild quality steps at the seams on complex content.

ParallelConstQp

Chunk across GPUs but force constant-QP so the seams are quality-flat, keeping the multi-GPU speedup. The QP is derived from the QualityTarget (via the per-encoder tuning CQ), so quality still tracks the target — the hand-rolled NVENC sets a real const-QP rather than a preset default. AMD/QSV are unchanged (already constant-QP).

Serial

Encode the whole file with one encoder — seam-free and QualityTarget-accurate, at the cost of the multi-GPU single-file speedup. (Like SingleGpu, but leaves multi-GPU in place for HLS jobs.)

Trait Implementations

impl Clone for ChunkSeamMode

fn clone(&self) -> ChunkSeamMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ChunkSeamMode

impl Debug for ChunkSeamMode

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

Formats the value using the given formatter.

impl Default for ChunkSeamMode

fn default() -> ChunkSeamMode

Returns the “default value” for a type.

impl Eq for ChunkSeamMode

impl PartialEq for ChunkSeamMode

fn eq(&self, other: &ChunkSeamMode) -> 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 StructuralPartialEq for ChunkSeamMode