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wm4 74beead9bd 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.)

Signed-off-by: Anton Khirnov <anton@khirnov.net>
2016-04-30 08:31:08 +02:00
compat jack: Support OSX 2016-03-31 18:03:21 +02:00
doc opt: Add av_opt_copy() 2016-03-24 10:34:15 +02:00
libavcodec mmaldec: limit internal buffering 2016-04-30 08:31:08 +02:00
libavdevice build: Split test programs off into separate files 2016-04-07 16:14:42 +02:00
libavfilter build: Split test programs off into separate files 2016-04-07 16:14:42 +02:00
libavformat libavformat: Update the comment about AVOutputFormat flags 2016-04-21 11:20:46 +03:00
libavresample build: miscellaneous cosmetics 2016-04-07 15:26:08 +02:00
libavutil testprogs: Mark some tables as static const 2016-04-29 16:21:23 +02:00
libswscale build: miscellaneous cosmetics 2016-04-07 15:26:08 +02:00
presets presets: spelling error in libvpx 1080p50_60 2011-10-22 00:28:56 +02:00
tests fate: Add test for MSS1 2016-04-27 11:57:45 +02:00
tools avpacket: Replace av_free_packet with av_packet_unref 2015-10-26 18:00:55 +01:00
.gitattributes Treat all '*.pnm' files as non-text file 2014-11-28 17:52:43 -05:00
.gitignore Generate the lists of enabled protocols/bsfs from configure. 2016-04-19 13:34:07 +02:00
.travis.yml travis: Enable OSX integration 2015-11-17 16:51:00 +01:00
arch.mak ppc: vsx: Implement float_dsp 2015-05-31 12:07:11 +02:00
avconv.c avconv: Drop an unused variable 2016-04-01 05:30:22 +02:00
avconv.h avconv: VAAPI hwcontext initialisation and hwaccel helper 2016-03-30 09:04:53 +02:00
avconv_dxva2.c avconv_dxva2: add hevc support 2015-01-27 09:06:05 +01:00
avconv_filter.c avconv: VAAPI hwcontext initialisation and hwaccel helper 2016-03-30 09:04:53 +02:00
avconv_opt.c avconv: VAAPI hwcontext initialisation and hwaccel helper 2016-03-30 09:04:53 +02:00
avconv_qsv.c avconv: add support for Intel QSV-accelerated transcoding 2015-10-16 20:01:37 +02:00
avconv_vaapi.c avconv: VAAPI hwcontext initialisation and hwaccel helper 2016-03-30 09:04:53 +02:00
avconv_vda.c avconv: vda: Unlock the pixel buffer once it is accessed 2015-07-09 00:10:13 +02:00
avconv_vdpau.c avconv_vdpau: use the hwcontext API to simplify code 2016-02-14 22:07:44 +01:00
avplay.c avplay: convert do codecpar 2016-02-24 10:05:43 +01:00
avprobe.c avprobe: switch to codecpar 2016-02-26 09:15:29 +01:00
Changelog mmaldec: add vc1 decoding support 2016-04-30 08:19:53 +02:00
cmdutils.c avconv: switch to the new BSF API 2016-03-20 08:15:01 +01:00
cmdutils.h avconv: use read_file() for reading the 2pass stats 2015-07-19 09:37:11 +02:00
cmdutils_common_opts.h avplay: Accept cpuflags option 2013-10-22 10:49:31 +02:00
common.mak build: Drop redundant removal of compiled object files 2016-03-24 19:17:23 +01:00
configure mmaldec: limit internal buffering 2016-04-30 08:31:08 +02:00
COPYING.GPLv2 Rename COPYING.GPL --> COPYING.GPLv2 and COPYING.LGPL --> COPYING.LGPLv2.1. 2009-06-05 09:51:31 +00:00
COPYING.GPLv3 Add configure option to upgrade (L)GPL to version 3. 2009-06-05 11:04:03 +00:00
COPYING.LGPLv2.1 cosmetics: Delete empty lines at end of file. 2012-02-09 12:26:45 +01:00
COPYING.LGPLv3 Add configure option to upgrade (L)GPL to version 3. 2009-06-05 11:04:03 +00:00
CREDITS partially rename FFmpeg to Libav 2011-03-16 21:54:39 +01:00
INSTALL doc: clarify configure features 2011-04-07 02:54:12 +02:00
library.mak build: Split test programs off into separate files 2016-04-07 16:14:42 +02:00
LICENSE license: Mention that vf_interlace is GPL, not LGPL 2014-08-28 19:47:43 +02:00
Makefile Generate the lists of enabled protocols/bsfs from configure. 2016-04-19 13:34:07 +02:00
README doc: Add more information in the README 2014-08-16 00:49:22 +02:00
README.md doc: Add travis badge 2015-09-14 00:19:08 +02:00
RELEASE Make the RELEASE file match with the most recent tag 2014-12-01 07:51:14 -05:00
version.sh Drop git- prefix from version labels 2011-06-19 19:41:23 +01:00

README.md

Libav

Build Status

Libav 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.
  • libavresample implements audio mixing and resampling routines.
  • libswscale implements color conversion and scaling routines.

Tools

  • avconv is a command line toolbox to manipulate, convert and stream multimedia content.
  • avplay is a minimalistic multimedia player.
  • avprobe is a simple analisys 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

Conding examples are available in the doc/example directory.

License

Libav codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.