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wm4 be583c6fd3 avcodec/h264: remove redundant and bogus get_format call 
The AVCodecContext.get_format callback is not only used for pixel format
negotiation with the API user, but also for hwaccel init. For the
latter, it's required that some codec parameters, in particular the
codec profile, are set when the callback is invoked.

This patch removes a get_format invocation where this is not guaranteed.
The codec parameters, including the profile, are really set further
below. (The same code path that sets the profile also calls get_format
properly too.)

This just happened to work by coincidence in most cases. For example, if
the API user just copied or reused the AVStream's AVCodecContext when
decoding, the profile would be set properly. But in some cases it
fails., such as with the sample WolfensteinTwitch.mp4 on the samples
server.

Remove the redundant get_format call. Apparently it serves no purpose
anymore, although it is possible that this was different at the time it
was added in commit ffd77f94a2.

This fixes hwaccel usage for API users which do not set the profile
when setting up the AVCodecContext (which is allowed).
2015-10-15 20:16:13 +02:00
compat winrt: multithreading support 2015-10-16 00:54:57 +11:00
doc doc/ffmpeg: use stream_loop instead of loop 2015-10-14 21:56:31 -04:00
libavcodec avcodec/h264: remove redundant and bogus get_format call 2015-10-15 20:16:13 +02:00
libavdevice avdevice/libdc1394: add const to suppress "assignment discards const qualifier from pointer target type" warnings 2015-09-20 22:12:37 +02:00
libavfilter avfilter/af_tremolo: clean up extra newlines 2015-10-15 03:14:47 +02:00
libavformat avformat/hls: add support for EXT-X-MAP 2015-10-15 15:04:00 +03:00
libavresample avresample: Remove an unused variable 2015-09-29 14:33:01 +02:00
libavutil winrt: multithreading support 2015-10-16 00:54:57 +11:00
libpostproc Merge commit 'e88103a7f9' 2015-09-05 21:35:46 +02:00
libswresample doc/resampler, swresample/options: use proper capitalization 2015-10-10 20:49:54 +02:00
libswscale swscale: fix ticket #4881 2015-10-13 13:43:39 -03:00
presets presets: remove moldering iPod presets 2014-06-17 16:15:04 -08:00
tests avutil/fifo: add function av_fifo_generic_peek_at() 2015-10-14 20:23:58 +02:00
tools Merge commit '87e5d8d78c' 2015-09-07 12:27:21 +02:00
.gitattributes Treat all '*.pnm' files as non-text file 2014-11-28 17:52:43 -05:00
.gitignore gitignore: ignore object file temporaries 2015-10-10 20:30:41 +02:00
.travis.yml Merge commit '1e0b8bf0b3' 2015-09-12 13:31:22 +02:00
arch.mak use mmi instead of loongson3 as simd-optimization flag 2015-07-07 03:46:57 +02:00
Changelog AAC encoder: Extensive improvements 2015-10-11 17:29:50 -03:00
cmdutils.c cmdutils: silence unused warnings under --disable-swscale, --disable-swresample 2015-10-03 19:26:09 +02:00
cmdutils.h cmdutils: remove sws_opts usage, simplify code 2015-08-08 16:51:25 +02:00
cmdutils_common_opts.h opts: add list device sources/sinks options 2014-10-25 20:20:31 +02:00
cmdutils_opencl.c OpenCL: Avoid potential buffer overflow in cmdutils_opencl.c 2015-04-28 12:18:23 +02:00
common.mak Merge commit 'c1aac39eac' 2015-10-14 13:54:50 +02:00
configure winrt: multithreading support 2015-10-16 00:54:57 +11:00
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
ffmpeg.c ffmpeg: add deprecation guards around remaining AVFMT_RAWPICTURE usage 2015-10-14 14:52:43 +02:00
ffmpeg.h Merge commit '16b0c92962' 2015-10-14 14:28:20 +02:00
ffmpeg_dxva2.c ffmpeg_dxva2: call GetDesktopWindow() in place of GetShellWindow() 2015-06-03 16:25:08 +02:00
ffmpeg_filter.c Revert "Merge commit '8b830ee9a2'" (avconv: Do not try to configure filter outputs without streams) 2015-10-11 12:24:43 +02:00
ffmpeg_opt.c ffmpeg_opt: rename loop option to stream_loop 2015-10-14 21:06:28 +02:00
ffmpeg_vdpau.c ffmpeg_vdpau: Ignore decoder's max supported level 2015-08-16 15:02:33 -07:00
ffmpeg_videotoolbox.c ffmpeg/videotoolbox: protect UTGetOSTypeFromString on both VDA and VT 2015-10-15 10:22:31 +02:00
ffplay.c ffplay: eliminate stream_component_close forward declaration 2015-10-12 00:07:38 +02:00
ffprobe.c ffprobe: use AV_OPT_TYPE_BOOL for writers options 2015-09-12 17:50:22 +02:00
ffserver.c ffserver: avoid leaking pathname at exit 2015-10-04 22:31:22 -07:00
ffserver_config.c ffserver_config: check for INT_MIN before doing FFABS 2015-10-13 19:40:09 -04:00
ffserver_config.h ffserver: Use singlejpeg muxer for jpeg 2015-06-08 03:36:22 +02:00
INSTALL.md INSTALL: add markdown syntax 2014-05-28 22:38:38 +02:00
library.mak build: add LDLIBFLAGS 2015-07-08 14:35:02 +02:00
LICENSE.md avfilter: add rubberband wrapper 2015-09-20 19:54:57 +02:00
MAINTAINERS avfilter/vf_chromakey: Add chromakey video filter 2015-09-23 18:10:14 +02:00
Makefile avcodec: add new Videotoolbox hwaccel. 2015-08-03 10:12:10 +02:00
README.md README: replace http with https 2015-10-06 13:27:29 +02:00
RELEASE RELEASE: update to 2.8.git 2015-09-09 23:53:15 -03:00
version.sh version.sh: Print versions based on the last git tag for release branches 2014-07-28 15:44:59 +02:00

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.
  • ffserver is a multimedia streaming server for live broadcasts.
  • 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. Few developers follow pull requests so they will likely be ignored.