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b88be742fa
This commit solves most of the crashes and issues with the encoder and the bitrate setting. Now the encoder will always allocate the absolute lowest amount of memory regardless of what the bitrate has been set to. Therefore if a user inputs a very low bitrate the encoder will use the maximum possible quantization (basically zero out all coefficients), allocate a packet and encode it. There is no coupling between the bitrate and the allocation size and so no crashes because the buffer isn't large enough. The maximum quantizer was raised to the size of the table now to both keep the overshoot at ridiculous bitrates low and to improve quality with higher bit depths (since the coefficients grow larger per transform quantizing them to the same relative level requires larger quantization indices). Since the quantization index start follows the previous quantization index for that slice, the quantization step was reduced to a static 1 to improve performance. Previously with quant/5 the step was usually set to 0 upon start (and was later clipped to 1), that isn't a big change. As the step size increases so does the amount of bits leftover and so the redistribution algorithm has to iterate more and thus waste more time. Signed-off-by: Rostislav Pehlivanov <atomnuker@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.
- 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.