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There have been many reports over the years about problems when taking an HLS stream as input to `ffmpeg` where there are timestamp discontinuities present. This is explicitly supported in the HLS spec (EXT-X-DISCONTINUITY) and often used for ad injection. Various fixes and work-arounds have been proposed over the years, but one step that seems obvious, even if it's not a complete fix, is to mark the HLS input format as supporting discontinuities. This will prevent timestamp fixup logic in ffmpeg.c kicking in that ends up mangling the timestamps unnecessarily. I've tested this out with an example provided by Joe Koberg early last year, and it is sufficient to allow `ffmpeg` to download and mux the stream correctly. Joe had briefly suggested that other situations can still be handled incorrectly, but this seems like a strict improvement. Joe's example: https://s3.amazonaws.com/playon-test-videos/discont_test_new/discont_test.m3u8 Reviewed-by: Steven Liu <lq@onvideo.cn> Reviewed-by: Dennis Mungai <dmngaie@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 a mean to alter decoded Audio and Video through chain of 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 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.