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Zhong Li 1125277bc6 lavc/qsvenc: enable hevc gpb option 
GPB is the default type, just contains forward references but the
slice_type is B slice with higher encoding efficiency than regular P
slice, but lower performance.

Add an option to allow user to set regular P slice.

Fix ticket#6870

Test data on Intel Kabylake (i7-7567U CPU @ 3.50GHz):
1. ffmpeg -hwaccel qsv -c:v h264_qsv -i bbb_sunflower_1080p_30fps_normal.mp4 -vsync passthrough
-vframes 1000  -c:v hevc_qsv -gpb 0 -bf 0 -q 25 test_gpb_off_bf0_kbl.mp4

transcoding fps: 85
encoded file size of test_gpb_off_bf0_kbl.mp4: 21960100 (bytes)

2. ffmpeg -hwaccel qsv -c:v h264_qsv -i bbb_sunflower_1080p_30fps_normal.mp4 -vsync passthrough
-vframes 1000  -c:v hevc_qsv -gpb 1 -bf 0 -q 25 test_gpb_on_bf0_kbl.mp4

transcoding fps: 79
encoded file size oftest_gpb_on_bf0_kbl.mp4:  21211449 (bytes)

In this case, enable gpb can bring about 7% performance drop but 3.4% encoding efficiency improvment.

Signed-off-by: Zhong Li <zhong.li@intel.com>
2019-04-03 23:00:15 +08:00
compat additional math.h functions for djgpp 2018-11-28 22:16:07 +11:00
doc avformat/dashenc: Add support for Global SIDX 2019-04-02 11:16:06 +05:30
ffbuild Merge commit '7e5bde93a1e7641e1622814dafac0be3f413d79b' 2019-03-10 19:31:13 -03:00
fftools fftools/ffmpeg: Check if we do have also a filter_complex filter. 2019-03-28 21:29:20 +01:00
libavcodec lavc/qsvenc: enable hevc gpb option 2019-04-03 23:00:15 +08:00
libavdevice lavd/v4l2: Fix the type of the probe function. 2019-03-23 23:42:09 +01:00
libavfilter avfilter/vf_yadif_cuda: Remove unnecessary stream synchronisation 2019-03-30 08:55:15 -07:00
libavformat lavf/movenc: fix tmcd writing for non-MP4/MOV modes 2019-04-03 15:50:22 +05:30
libavresample
libavutil avutil/hcontext_cuda: Remove unnecessary stream synchronisation 2019-03-30 10:56:49 -07:00
libpostproc postproc/postprocess_template: remove FF_REG_sp from clobber list 2018-12-22 17:41:44 +01:00
libswresample Bump minor version for master after 4.1 branchpoint 2018-11-02 00:53:07 +01:00
libswscale swscale/ppc: VSX-optimize yuv2422_X 2019-03-31 12:41:34 +03:00
presets
tests lavf/movenc: fix tmcd writing for non-MP4/MOV modes 2019-04-03 15:50:22 +05:30
tools tools/target_dec_fate.list: add issues 4000 to 6000 2019-03-20 21:12:45 +01:00
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.travis.yml Merge commit '899ee03088d55152a48830df0899887f055da1de' 2019-03-14 15:53:16 -03:00
Changelog avcodec: add Amuse Graphics decoder 2019-03-31 10:48:43 +02:00
configure configure: include pkgconfig path as vaapi header search 2019-03-28 21:47:15 +08:00
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
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CREDITS
INSTALL.md INSTALL.md: Fix Markdown formatting 2019-01-31 10:29:16 -09:00
LICENSE.md
MAINTAINERS MAINTAINERS: remove myself as mailing list maintainer 2019-03-21 11:34:13 -08:00
Makefile Merge commit '7e5bde93a1e7641e1622814dafac0be3f413d79b' 2019-03-10 19:31:13 -03:00
README.md
RELEASE RELEASE: bump to 4.1.git 2018-11-02 00:55:49 +01:00

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.
  • 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 and will be ignored.