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mirror of https://github.com/FFmpeg/FFmpeg.git synced 2025-01-19 05:49:09 +02:00
Limin Wang d31a1266a7 avfilter/vf_showinfo: Fix erroneous results for mean and stdev with pixel bits >8
Have tested with be and le pixel format on be and le system for >8bit.
System:
lmwang@ubuntu:~/ffmpeg.git.mips$ grep HAVE_BIGENDIAN config.h
ffmpeg.git git:(showinfo) ✗ grep HAVE_BIGENDIAN config.h

Test result:
1, yuv420p
./ffmpeg -f lavfi  -i color=black:duration=1:r=1:size=1280x720,format=yuv420p,showinfo
Master:
mean:[16 128 128] stdev:[0.0 0.0 0.0]
After applied the patch:
 mean:[16 128 128] stdev:[0.0 0.0 0.0]

2, yuv420p10le
./ffmpeg -f lavfi  -i color=black:duration=1:r=1:size=1280x720,format=yuv420p10le,showinfo
Master:
mean:[32 1 1] stdev:[32.0 1.0 1.0]
After applied the patch:
mean:[64 512 512] stdev:[0.0 0.0 0.0]

3, yuv420p10be
./ffmpeg -f lavfi  -i color=black:duration=1:r=1:size=1280x720,format=yuv420p10be,showinfo
Master:
mean:[32 1 1] stdev:[32.0 1.0 1.0]
After applied the patch:
mean:[64 512 512] stdev:[0.0 0.0 0.0]

Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2020-01-07 02:49:44 +01:00
2019-01-31 10:29:16 -09:00
2019-12-28 11:20:48 +01:00

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.

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