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Andreas Rheinhardt a3e43e0cf3 avformat/av1: Avoid allocation + copying when filtering OBUs Certain types of OBUs are stripped away before muxing into Matroska and ISOBMFF; there are two functions to do this: One that outputs by directly writing in an AVIOContext and one that returns a freshly allocated buffer with the units not stripped away copied into it. The latter option is bad for performance, especially when the input does already not contain any of the units intended to be stripped away (this covers typical remuxing scenarios). Therefore this commit changes this by avoiding allocating and copying when possible; it is possible if the OBUs to be retained are consecutively in the input buffer (without an OBU to be discarded between them). In this case, the caller receives the offset as well as the length of the part of the buffer that contains the units to be kept. This also avoids copying when e.g. the only unit to be discarded is a temporal delimiter at the front. For a 22.7mb/s file with average framesize 113 kB this improved the time for the calls to ff_av1_filter_obus_buf() when writing Matroska from 313319 decicycles to 2368 decicycles; for another file with 1.5mb/s (average framesize 7.3 kB) it improved from 34539 decicycles to 1922 decicyles. For these files the only units that needed to be stripped away were temporal unit delimiters at the front. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>		5 years ago
compat	avutil/thread: Add pthread_cond_timedwait function	5 years ago
doc	doc/outdevs: Mention "sdl2" alias for "sdl".	5 years ago
ffbuild	build: add support for building CUDA files with clang	5 years ago
fftools	cmdutils: Fix compilation on cygwin wrt SetDllDirectory and GetModuleHandle	5 years ago
libavcodec	avcodec: add decoder for argonaut games' adpcm codec	5 years ago
libavdevice	avdevice/xcbgrab: check if frame size fits in INT_MAX	5 years ago
libavfilter	avfilter/scale: don't fail for circular expressions	5 years ago
libavformat	avformat/av1: Avoid allocation + copying when filtering OBUs	5 years ago
libavresample	avresample: remove deprecated attribute from the AVAudioResampleContext struct	7 years ago
libavutil	avutil/thread: fix strict_pthread_cond_timedwait	5 years ago
libpostproc	Silence "string-plus-int" warning shown by clang.	5 years ago
libswresample	Silence "string-plus-int" warning shown by clang.	5 years ago
libswscale	swscale/input: Fix several invalid shifts related to rgb2yuv constants	5 years ago
presets	presets: remove moldering iPod presets	11 years ago
tests	checkasm: Check HAVE_GETSTDHANDLE here as well	5 years ago
tools	tools/target_dec_fuzzer: Use codec_tags list	5 years ago
.gitattributes	fate: add SCC test	8 years ago
.gitignore	tools/python: add script to convert TensorFlow model (.pb) to native model (.model)	6 years ago
.travis.yml	Merge commit '899ee03088d55152a48830df0899887f055da1de'	6 years ago
CONTRIBUTING.md	Add CONTRIBUTING.md	8 years ago
COPYING.GPLv2	…
COPYING.GPLv3	Add configure option to upgrade (L)GPL to version 3.	16 years ago
COPYING.LGPLv2.1	cosmetics: Delete empty lines at end of file.	13 years ago
COPYING.LGPLv3	Add configure option to upgrade (L)GPL to version 3.	16 years ago
CREDITS	CREDITS: redirect to Git log, remove current outdated content	12 years ago
Changelog	avformat: add demuxer for argonaut games' ASF format	5 years ago
INSTALL.md	INSTALL.md: Fix Markdown formatting	6 years ago
LICENSE.md	avfilter/vf_geq: Relicense to LGPL	5 years ago
MAINTAINERS	MAINTAINERS: add myself as libxavs2 maintainer	5 years ago
Makefile	tools: add a fuzzer tool for bitstream filters	5 years ago
README.md	Remove the ffserver program	7 years ago
RELEASE	RELEASE: Update value for post 4.2 branch	6 years ago
configure	configure: Check for GetStdHandle in addition to SetConsoleTextAttribute	5 years ago

README.md

FFmpeg README

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

libavcodec provides implementation of a wider range of codecs.
libavformat implements streaming protocols, container formats and basic I/O access.
libavutil includes hashers, decompressors and miscellaneous utility functions.
libavfilter provides a mean to alter decoded Audio and Video through chain of filters.
libavdevice provides an abstraction to access capture and playback devices.
libswresample implements audio mixing and resampling routines.
libswscale implements 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, ismindex and qt-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.