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wm4 14a90c9ef0 mmaldec: limit internal buffering 
This uses a new MMAL feature, which limits the number of extra frames
that can be buffered within the decoder. VIDEO_MAX_NUM_CALLBACKS can
be defined as positive or negative number. Positive numbers are
absolute, and can lead to deadlocks if the user underestimates the
number of required buffers. Negative numbers specify the number of extra
buffers, e.g. -1 means no extra buffer, (-1-N) means N extra buffers.

Set a gratuitous default of -11 (N=10). This is much lower than the
firmware default, which appears to be 96.

This is backwards compatible, but needs a symbol only present in newer
firmware headers. (It's an enum item, so it requires a check in
configure.)
2016-01-28 17:24:53 +01:00
compat os2threads: Add pthread_once() 2015-11-12 22:31:46 +01:00
doc avfilter/vf_zscale: make it possible to override input frame parameters 2016-01-26 23:13:16 +01:00
libavcodec mmaldec: limit internal buffering 2016-01-28 17:24:53 +01:00
libavdevice avutil: Rename FF_CEIL_COMPAT to AV_CEIL_COMPAT 2016-01-27 16:36:46 +00:00
libavfilter Merge commit 'e8bc642202c10beda1ea4e93ec8492b1e39805e5' 2016-01-27 16:46:58 +00:00
libavformat Merge commit 'e4eb13ca77624401ea7cef1ed6ad8e2d13fd2063' 2016-01-27 18:32:28 +00:00
libavresample Merge commit 'cc4c24208159200b7aff5b5c313903c7f23fa345' 2016-01-02 10:13:58 +01:00
libavutil avutil: Rename FF_CEIL_COMPAT to AV_CEIL_COMPAT 2016-01-27 16:36:46 +00:00
libpostproc Merge commit 'e88103a7f92cf27a2868b50acc8a9912f6088249' 2015-09-05 21:35:46 +02:00
libswresample swr/resample: use av_clip_int16 instead of av_clip 2015-12-24 11:29:52 -08:00
libswscale avutil: Rename FF_CEIL_COMPAT to AV_CEIL_COMPAT 2016-01-27 16:36:46 +00:00
presets presets: remove moldering iPod presets 2014-06-17 16:15:04 -08:00
tests FATE: update AAC encoder PNS test target 2016-01-27 23:55:24 +00:00
tools avcodec: Remove libstagefright 2016-01-06 16:43:06 +00:00
.gitattributes Treat all '*.pnm' files as non-text file 2014-11-28 17:52:43 -05:00
.gitignore build: use a link instead of changing current directory when compiling 2016-01-25 20:43:34 +01:00
.travis.yml Merge commit 'eda183287489b2c705843aa373a19c4e46fb2fec' 2015-11-22 17:12:24 +00:00
arch.mak mips: rename mipsdspr1 to mipsdsp 2015-12-04 02:35:42 +01:00
Changelog avcodec: add Ulead DV audio decoder 2016-01-26 23:14:40 +01:00
cmdutils_common_opts.h opts: add list device sources/sinks options 2014-10-25 20:20:31 +02:00
cmdutils_opencl.c all: use FFDIFFSIGN to resolve possible undefined behavior in comparators 2015-11-03 16:28:30 -05:00
cmdutils.c cosmetics: Fix weird indentations 2015-12-07 10:43:43 -08:00
cmdutils.h cmdutils: remove sws_opts usage, simplify code 2015-08-08 16:51:25 +02:00
common.mak build: use a link instead of changing current directory when compiling 2016-01-25 20:43:34 +01:00
configure mmaldec: limit internal buffering 2016-01-28 17:24:53 +01:00
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CREDITS CREDITS: redirect to Git log, remove current outdated content 2013-01-31 18:02:52 +01:00
ffmpeg_dxva2.c ffmpeg_dxva2: support vp9 hwaccel 2015-12-07 09:47:51 +01:00
ffmpeg_filter.c ffmpeg_filter: remove redundant null ptr check 2015-11-11 01:51:52 +01:00
ffmpeg_opt.c ffmpeg_opt: Allow -metadata option to set metadata on programs. 2016-01-26 17:36:08 +01:00
ffmpeg_qsv.c Merge commit 'fb472e1a11a4e0caed2c3c91da01ea8e35d9e3f8' 2015-10-22 16:18:02 +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
ffmpeg.c Merge commit '63f7f8d1dbf6ce27440fdd56ef38c822fb11b9c2' 2016-01-19 08:41:32 +01:00
ffmpeg.h ffmpeg: use lavf API for applying bitstream filters 2015-12-28 08:34:30 -06:00
ffplay.c ffplay: update docs after previous changes in ffplay mouse behaviour 2016-01-20 21:23:03 +01:00
ffprobe.c ffprobe: avoid unnecessary pow and exp2 calls 2015-12-29 08:59:16 -08:00
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
ffserver.c ffserver: Cast time_t value when using it in a format string. 2015-12-29 16:00:34 +01:00
INSTALL.md INSTALL: add markdown syntax 2014-05-28 22:38:38 +02:00
library.mak build: use a link instead of changing current directory when compiling 2016-01-25 20:43:34 +01:00
LICENSE.md avfilter: add rubberband wrapper 2015-09-20 19:54:57 +02:00
MAINTAINERS avcodec: Remove libstagefright 2016-01-06 16:43:06 +00:00
Makefile build: use a link instead of changing current directory when compiling 2016-01-25 20:43:34 +01:00
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: add note that ffversion.h is auto-generated 2015-10-25 10:14:44 -04:00

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.