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Rostislav Pehlivanov e3faad811e aacenc_tns: adjust coefficient calculation, add double filter support 
This commit improves the TNS implementation to the point where it's
actually usable and very rarely results in nastyness (in all bitrates
except extremely low bitrates it's increasing the quality and prevents
some distortions from the coder being audiable).

Also adds a double filter support which is only used if the energy
difference between the top and bottom of the SFBs is above the
thresholds defined in the header file. Looking at the bitstream
that fdk_aac generates it sometimes used a double filter despite
the specs stating that a single filter should be enough for almost
all cases and purposes.

Unlike FAAC or fdk_aac we sometimes use a reverse filter in case
the energy difference isn't enought to use a double filter. This
actually works better.

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
2015-09-05 09:08:30 +01:00
compat use a wrapper script to call MS link.exe to avoid mixing with /usr/bin/link.exe 2015-07-24 20:02:32 +02:00
doc avfilter/vf_waveform: change intensity to float 2015-09-04 17:14:32 +00:00
libavcodec aacenc_tns: adjust coefficient calculation, add double filter support 2015-09-05 09:08:30 +01:00
libavdevice avdevice/libdc1394: Make dc1394_frame_format and dc1394_frame_rate, static 2015-08-30 13:10:11 +02:00
libavfilter avfilter/vf_vectorscope: change intensity to float 2015-09-04 18:47:46 +00:00
libavformat lavf/mxfdec: Support more codecs in mxf_picture_essence_container_uls[]. 2015-09-05 00:11:14 +02:00
libavresample x86inc: Drop SECTION_TEXT macro 2015-08-04 20:13:09 +02:00
libavutil avutil/common: Add FFNABS() 2015-09-03 09:05:50 +02:00
libpostproc avutil/x86/asm: rename REG_SP to REG_sp 2015-08-22 02:56:53 +02:00
libswresample swresample/swresample: Fix integer overflow in seed calculation 2015-09-03 09:32:43 +02:00
libswscale swscale: re-enable gamma 2015-09-04 19:00:20 -03:00
presets presets: remove moldering iPod presets 2014-06-17 16:15:04 -08:00
tests vp9_parse: fix parsing of pskip and profile 2/3. 2015-09-04 09:59:17 -04:00
tools graph2dot: use avfilter_pad_get_name accessor function 2015-08-20 22:38:01 +02:00
.gitattributes Treat all '*.pnm' files as non-text file 2014-11-28 17:52:43 -05:00
.gitignore doc/examples: rename avio_list_dir -> avio_dir_cmd 2015-08-16 02:16:47 +02:00
arch.mak use mmi instead of loongson3 as simd-optimization flag 2015-07-07 03:46:57 +02:00
Changelog lavc/j2kenc: Remove experimental flag. 2015-09-04 23:48:32 +02:00
cmdutils.c ffmpeg: replace deprecated av_log_ask_for_sample with av_log 2015-08-12 00:14:13 +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 '3ae0e721c7' 2015-07-22 16:30:37 +02:00
configure configure: Do not let the webm muxer suggest external libraries. 2015-08-28 06:03:58 +02:00
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1 cosmetics: Delete empty lines at end of file. 2012-02-09 12:26:45 +01:00
COPYING.LGPLv3
CREDITS CREDITS: redirect to Git log, remove current outdated content 2013-01-31 18:02:52 +01:00
ffmpeg.c ffmpeg: Drop redundant ist check 2015-09-04 11:42:23 +02:00
ffmpeg.h ffmpeg: switch swscale option handling to AVDictionary similar to what the other subsystems use 2015-08-08 14:44:15 +02:00
ffmpeg_dxva2.c ffmpeg_dxva2: call GetDesktopWindow() in place of GetShellWindow() 2015-06-03 16:25:08 +02:00
ffmpeg_filter.c lavfi: fix compilation with FF_API_OLD_FILTER_OPTS=0. 2015-08-18 22:22:49 -04:00
ffmpeg_opt.c ffmpeg: Improve help text for -target. 2015-09-02 14:32:06 +02:00
ffmpeg_vdpau.c ffmpeg_vdpau: Ignore decoder's max supported level 2015-08-16 15:02:33 -07:00
ffmpeg_videotoolbox.c avcodec: add new Videotoolbox hwaccel. 2015-08-03 10:12:10 +02:00
ffplay.c Put remaining pieces of CODEC_FLAG_EMU_EDGE under FF_API_EMU_EDGE. 2015-08-28 14:40:59 -04:00
ffprobe.c ffprobe: check av_asprintf() for failure 2015-06-13 01:45:27 +02:00
ffserver.c ffserver: cast PID to int64_t before printing 2015-08-21 15:47:54 +02:00
ffserver_config.c ffserver: use -b instead of -ab for setting audio bitrate. 2015-08-28 14:59:58 -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/vf_removegrain: add x86 and x86_64 SSE2 functions 2015-07-14 23:50:50 +00:00
MAINTAINERS MAINTAINERS: add myself as an AAC encoder maintainer 2015-08-21 19:44:15 +01:00
Makefile avcodec: add new Videotoolbox hwaccel. 2015-08-03 10:12:10 +02:00
README.md README: add ffserver 2015-02-12 11:59:22 +01:00
RELEASE RELEASE: update to 2.7.git 2015-07-19 17:52:31 -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.