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The TrueHD IEC 61937 encapsulation code uses a very naive method of always inserting 24 TrueHD frames evenly in a MAT frame. This does not work for larger frames as they may exceed the size of 1/24th of a MAT frame. To fix that, use the input_timing field in the TrueHD frame to determine the proper position of the TrueHD frame in the MAT frame. That field is basically a dts field, telling the time to feed this frame to the decoder in sample count units. This can cause a TrueHD frame to be split between two MAT frames, so a second concatenation hd_buf is added, alternating with the first buffer. Large frames are preceded by smaller frames that have input_timing values that cause the frames to be sent out faster than the nominal rate (i.e. increasing decoder latency, long decoder buffer), allowing the larger frames to then be sent out slower than the nominal rate as the decoder has enough data buffered to keep it busy.
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.