coreav ffmpeg

coreav ffmpeg ARGS takes an ffmpeg command line in ffmpeg’s own syntax and runs it with CoreAV’s own writers, when it is a stream copy (-c copy) that CoreAV implements. It selects streams as ffmpeg does, with or without -map.

The command line	What runs
A copy to `.mp4` (or `-f mp4`) from MP4, MOV, Matroska or WebM	`coreav remux` of the selected streams
A copy of one audio stream to `.m4a` (or `-f ipod`)	`coreav extract-audio`
`-ss`, `-t` or `-to`, before or after `-i`	`coreav clip`, or for a copy of one audio stream and no video, a clip of that audio alone
`-f segment` with MP4 segments	`coreav split --every` at `-segment_time`
`-f concat` with an MP4 output	`coreav join` of the list’s files

In a build with a decoder backend, it also runs a command line that encodes the video with libx264, through coreav transcode. The build’s backends decode the video, and an x264 program encodes it, or an ffmpeg program built with libx264 when no x264 program is found. Strict-safe mode changes neither (what strict-safe mode covers). Any other command line is refused in strict-safe mode, and goes to the real ffmpeg otherwise (strict-safe mode and the fallback). The outputs pass the job oracles on the fixtures in CI. The 0.1.0 bars on held-out files are not measured yet (the 0.1.0 release issue).

Examples

coreav --strict-safe ffmpeg -i input.mkv -c copy -movflags +faststart output.mp4
coreav --strict-safe ffmpeg -ss 10 -t 5 -i input.mp4 -c copy clip.mp4
coreav --strict-safe ffmpeg -f concat -safe 0 -i list.txt -c copy joined.mp4

coreav ffmpeg prints nothing on success. It writes the output to a temporary file and moves it into place only when the whole job succeeded.

Use it in place of ffmpeg

A link named ffmpeg that points to coreav behaves as coreav ffmpeg with the whole argument list. Under that name, only COREAV_STRICT_SAFE=1 turns on strict-safe mode.

Options

coreav ffmpeg has no help text of its own. coreav ffmpeg --help is an informational query, which CoreAV does not implement: strict-safe mode refuses it, and otherwise it prints the real ffmpeg’s help through the fallback. The compatibility command’s design note lists the options it implements.

Overview

Inspect

Cut and rewrite

Extract and decode

Serve

FFmpeg command lines

Builds with a decoder backend

Examples

Use it in place of ffmpeg

Options

​Examples

​Use it in place of ffmpeg

​Options

Examples

Use it in place of ffmpeg

Options