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46f23be8b1
ALSA capture can assemble a packet from multiple successful reads, possibly across EAGAIN returns. The timestamp calculation still uses the frame count from the final read, so it subtracts too little audio time. The same count also supplies the wrong interval to the next time-filter update. Use the completed packet's frame count for both calculations. A 7680-frame packet assembled from two 3840-frame reads at 48 kHz otherwise receives a first PTS 80 ms too late. Single-read packets retain the same calculation. Reproduced with real ALSA short returns under ARM64 QEMU: a capture PCM was primed by half a period, then read in nonblocking mode or interrupted by SIGALRM while waiting for the remainder. No read return values were changed in those tests. The fix also passes deterministic sample-order, PTS, EAGAIN and XRUN recovery checks at 44.1, 48, 96 and 192 kHz. Signed-off-by: Joonho Lee <mynameisjune111@gmail.com>
FFmpeg README
FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.
Libraries
libavcodecprovides implementation of a wider range of codecs.libavformatimplements streaming protocols, container formats and basic I/O access.libavutilincludes hashers, decompressors and miscellaneous utility functions.libavfilterprovides means to alter decoded audio and video through a directed graph of connected filters.libavdeviceprovides an abstraction to access capture and playback devices.libswresampleimplements audio mixing and resampling routines.libswscaleimplements color conversion and scaling routines.
Tools
- ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
- ffplay is a minimalistic multimedia player.
- ffprobe is a simple analysis tool to inspect multimedia content.
- Additional small tools such as
aviocat,ismindexandqt-faststart.
Documentation
The offline documentation is available in the doc/ directory.
The online documentation is available in the main website and in the wiki.
Examples
Coding examples are available in the doc/examples directory.
License
FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.
Contributing
Patches should be submitted to Forgejo or the ffmpeg-devel mailing list using git format-patch or git send-email. Github pull requests should be avoided because they are not part of our review process and will be ignored.
See https://ffmpeg.org/developer.html for more information.