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Ico Doornekamp edf54887e2 rtpdec_jpeg: fix low contrast image on low quality setting 
The problem is that the argument 'q' is of the type uint8_t.
According to the JPEG standard, if 1 <= q <= 50, the scale factor
'S' should be 5000 / Q. Because the create_default_qtables() reuses
the variable 'q' to store the result of this calculation, for small
values of q < 19, q wil subsequently overflow and give wrong results
in the calculated quantization tables.

Instead, use a new variable 'S' (same name as in RFC2435) with the
proper range to store the result of the division.

Signed-off-by: Martin Storsjö <martin@martin.st>
2016-03-26 00:15:24 +02:00
compat w32pthreads: Map MemoryBarrier to __sync_synchronize on mingw 2015-10-30 20:15:11 +02:00
doc opt: Add av_opt_copy() 2016-03-24 10:34:15 +02:00
libavcodec intrax8: Add a local BlockDSPContext and initialize it 2016-03-25 15:55:49 -04:00
libavdevice testprogs: Clean up #includes 2016-03-24 19:17:23 +01:00
libavfilter vf_fade: make sure the slice end is always in the frame 2016-03-25 14:53:31 +01:00
libavformat rtpdec_jpeg: fix low contrast image on low quality setting 2016-03-26 00:15:24 +02:00
libavresample avresample: Mark avresample_buffer() as pointer to const 2015-12-14 15:16:33 +01:00
libavutil testprogs: K&R formatting cosmetics 2016-03-24 21:45:07 +01:00
libswscale cosmetics: Drop empty comment lines 2016-02-18 15:35:30 +01:00
presets presets: spelling error in libvpx 1080p50_60 2011-10-22 00:28:56 +02:00
tests fate: Only run SRTP test if SRTP code is enabled 2016-03-24 19:17:23 +01:00
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 doc: Update paths to match new examples location 2016-03-23 09:35:40 +01:00
.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_dxva2.c avconv_dxva2: add hevc support 2015-01-27 09:06:05 +01:00
avconv_filter.c avconv: convert to codecpar 2016-02-23 17:01:58 +01:00
avconv_opt.c avconv: switch to the new BSF API 2016-03-20 08:15:01 +01:00
avconv_qsv.c avconv: add support for Intel QSV-accelerated transcoding 2015-10-16 20:01:37 +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
avconv.c avconv: use new encode API 2016-03-23 19:31:35 +01:00
avconv.h avconv: switch to the new BSF API 2016-03-20 08:15:01 +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 lavfi: add an NVIDIA NPP-based scaling filter 2016-03-23 19:55:34 +01:00
cmdutils_common_opts.h avplay: Accept cpuflags option 2013-10-22 10:49:31 +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
common.mak build: Drop redundant removal of compiled object files 2016-03-24 19:17:23 +01:00
configure intrax8: Add a local BlockDSPContext and initialize it 2016-03-25 15:55:49 -04:00
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: Support executable only ldflags 2014-07-21 22:18:35 +02:00
LICENSE license: Mention that vf_interlace is GPL, not LGPL 2014-08-28 19:47:43 +02:00
Makefile configure: ObjC support 2015-11-26 10:39:15 +01:00
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.