d07585f04a
When async issues its inner seek via ffurl_seek, it treats failures as EOF being reached. This is not consistent with the behavior of other protocols (e.g. http, cache) which continue to tolerate reads after failed seeks, and therefore does not interact correctly with them. A common pattern where this manifests itself is where avio_seek is called with pos to be the end-of-file - the http range-request would fail here, and async would set io_eof_reached to 1. The background thread would then refuse to read more bytes, and subsequent reads would only empty the fifo and end in an error. Presumably the code may have expected subsequent seeks to unset the io_eof_reached but this is not guaranteed to be true - a subsequent seek that lands in the AVIOContext's buffer (the fact that the previously-failed avio_seek leaves the AVIOContext's buffer intact also suggests that follow-up reads are expected to be tolerated) would not be issued to the async_seek function, and when that buffer is drained only async_read calls would follow, leading to the same error just described. Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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.
- ffserver is a multimedia streaming server for live broadcasts.
- 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. Few developers
follow pull requests so they will likely be ignored.