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Mats Peterson b6c61b7d43 lavf/qtpalette: Ignore greyscale bit in certain cases 
The QuickTime File Format Specification states the following:

"Depth: A 16-bit integer that indicates the pixel depth of the
compressed image. Values of 1, 2, 4, 8 ,16, 24, and 32 indicate the
depth of color images. The value 32 should be used only if the image
contains an alpha channel. Values of 34, 36, and 40 indicate 2-, 4-, and
8-bit grayscale, respectively, for grayscale images."

There is no mention of value 33, i.e. 1-bit video (0x01) with the
greyscale bit (0x20) set. I therefore suggest that we ignore the
greyscale bit when processing 1-bit video. Another reason to do this is
that the first 1-bit sample file below will be displayed properly with
blue colors in QuickTime in Windows or Mac *in spite of* the greyscale
bit being set.

Also, QuickTime in Windows or Mac ignores the greyscale bit if the
video sample description contains a palette, regardless of bit depth.
This is undocumented behaviour, but I think we should do the same, and
it seems pretty logical after all, since one wouldn't really bother
putting a customized palette into a grayscale file anyway. See the
second 8-bit sample file below, which has the greyscale bit set, and
which contains a palette in the video sample description. In Windows or
Mac, it will be displayed with the palette in the sample description, in
spite of the greyscale bit being set.

Sample file 1 (1-bit QuickTime Animation):
https://drive.google.com/open?id=0B3_pEBoLs0faTThSek1EeXQ0ZHM
Earth Spin 1-bit qtrle orig.mov

Sample file 2 (8-bit QuickTime Animation):
https://drive.google.com/open?id=0B3_pEBoLs0fad2s0V1YzUWo5aDA
quiz-palette+gs.mov

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2016-01-04 03:31:49 +01:00
compat
doc doc/encoders: Fix application name 2016-01-02 19:23:00 +01:00
libavcodec lavc/qtrle: Use AV_PIX_FMT_PAL8 for 1-bit video 2016-01-04 03:31:35 +01:00
libavdevice
libavfilter avfilter/avf_showspectrum: finally fix log scaler 2016-01-03 23:09:43 +01:00
libavformat lavf/qtpalette: Ignore greyscale bit in certain cases 2016-01-04 03:31:49 +01:00
libavresample Merge commit 'cc4c24208159200b7aff5b5c313903c7f23fa345' 2016-01-02 10:13:58 +01:00
libavutil avutil/cpu: add missing entry for vfp_vm to av_parse_cpu_caps 2016-01-02 19:07:08 +01:00
libpostproc
libswresample
libswscale
presets
tests lavc/qtrle: Use AV_PIX_FMT_PAL8 for 1-bit video 2016-01-04 03:31:35 +01:00
tools
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Changelog avfilter: add showspectrumpic filter 2016-01-02 18:53:09 +01:00
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ffmpeg_dxva2.c
ffmpeg_filter.c
ffmpeg_opt.c
ffmpeg_qsv.c
ffmpeg_vdpau.c
ffmpeg_videotoolbox.c
ffmpeg.c
ffmpeg.h
ffplay.c
ffprobe.c ffprobe: avoid unnecessary pow and exp2 calls 2015-12-29 08:59:16 -08:00
ffserver_config.c
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ffserver.c ffserver: Cast time_t value when using it in a format string. 2015-12-29 16:00:34 +01:00
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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.

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. Few developers follow pull requests so they will likely be ignored.