Measurements

Each measurement page states its bars, committed before the run, then the result, the method and the host, with the raw evidence beside it. A failed or superseded run stays on its page, marked as such (measurements and their evidence). The media corpus that the correctness bars use is private and is never published. docs/corpus.md records how its files were selected and how many there are.

Probe and stream copy

Page	What it measures
Stage 3 correctness report	Probe and stream-copy correctness on the fixtures and the corpus, and the hostile-input suite
Probe metadata against ffprobe	`coreav probe` metadata against `ffprobe` 7.0.2
Matroska demuxing	The Matroska and WebM parser against `ffprobe` and MediaInfo
One walk for the Matroska scan	Reading a Matroska file for the policy check in one pass
MPEG-TS demuxing	The MPEG transport stream parser against `ffprobe`
Matroska and WebM to MP4	`coreav remux` of Matroska and WebM files against the black-box oracles
Subtitles and chapters	`coreav extract-subtitles` and `coreav chapters` against `ffmpeg`, `ffprobe` and MediaInfo
Sources with several media edits	Subtitle and chapter timing on sources with several media edits
Known-divergence audit	Whether an accepted difference from the oracles can hide a probe bug
Known-divergence audit: the writers	The same question for the writers’ accepted differences

The compatibility command

Page	What it measures
`coreav ffprobe`	Which `ffprobe` command lines it covers, how often its values agree with `ffprobe`’s, and its speed

Speed of the command

Page	What it measures
`npx coreav` against FFmpeg	The installed `coreav` command against the FFmpeg command line for the same job
Tool baselines	Timing baselines of the reference tools. No CoreAV code is measured.

Decoding and transcoding

Page	What it measures
`coreav transcode`	Correctness and speed of the transcode against FFmpeg with libx264
The `x264` program on 10-bit sources	Where the extra time on 10-bit sources goes
VP9 through libvpx	`coreav thumbnail` and `coreav transcode` on VP9 with libvpx
AV1 thumbnails	The fixed cost of short AV1 decodes

The H.264 decoder

Page	What it measures
Correctness	Conformance: 97 of 97 in-scope JVT streams decode bit-exactly
Speed rounds	Single-thread speed against FFmpeg, round by round
SIMD kernels	Each SIMD kernel, and the decoder with them
Kernels on the training set	Kernel candidates timed on the training streams
Where the single-thread gap is	Which parts of the decoder the time difference to FFmpeg comes from
Changes measurement rejected	Each change that did not pass its bar, and the branch that keeps it

Limits and fuzzing

Page	What it measures
The pinned memory bounds	Peak memory on a 2.2 GB fragmented file, and allocation on hostile sample counts
Fuzz campaign 1	A bug-finding pass before the release gate
Fuzz campaign 2	The release gate on its commit

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Probe and stream copy

The compatibility command

Speed of the command

Decoding and transcoding

The H.264 decoder

Limits and fuzzing

​Probe and stream copy

​The compatibility command

​Speed of the command

​Decoding and transcoding

​The H.264 decoder

​Limits and fuzzing

Probe and stream copy

The compatibility command

Speed of the command

Decoding and transcoding

The H.264 decoder

Limits and fuzzing