[FFmpeg-trac] #2404(undetermined:new): When the video with "white background" the display is gray

[FFmpeg]

#2404: When the video with "white background" the display is gray
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             Reporter:  Ken_JJ  |                    Owner:
                 Type:  defect  |                   Status:  new
             Priority:  normal  |                Component:  undetermined
              Version:  1.2     |               Resolution:
             Keywords:  v4l2    |               Blocked By:
             Blocking:          |  Reproduced by developer:  0
Analyzed by developer:  0       |
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Comment (by Ken_JJ):

 Replying to [comment:1 cehoyos]:
 > Do you think this is a regression?
 >
 > Is the problem only reproducible if you use an external library
 (libx264) or also with a native encoder?
 > Is it reproducible with current git head?
 > Is audio necessary to reproduce the problem?
 > What happens if you remove "-s 720:480" from your command line?
 > And please provide the output of the following command:
 > $ ffmpeg -list_formats all -f v4l2 -i /dev/video0


 1.I think this is a regression,because I use capture card to grep TV's
 singal,so when the TV's Advertising is almost white background the problem
 is happen,but only the white background is error.

 2.I only use the libx264,and my OS is Ubuntu server version (not Desktop
 version,only console),so I can not use the TV software to watch TV(such as
 "tvtime").
 3.I get from the relase "http://ffmpeg.org/releases/ffmpeg-1.2.tar.bz2"
 4.Audio is perfet.
 5.When I remove "-s 720:480" the video image will be cut.(My output
 resolution is   640X480,so when I watch the TV,it is like be cut.
 6.
 Output command
 {{{
 ffmpeg -list_formats all -f v4l2 -i /dev/video0
 ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers
   built on Mar 25 2013 15:32:48 with gcc 4.6 (Ubuntu/Linaro
 4.6.3-1ubuntu5)
   configuration: --enable-version3 --enable-libopencore-amrnb --enable-
 libopenco
 re-amrwb --enable-libvpx --enable-libfaac --enable-libmp3lame --enable-
 libtheora
 --enable-libvorbis --enable-libx264 --enable-libxvid --enable-gpl
 --enable-post
 proc --enable-nonfree --enable-network --enable-protocol=tcp --enable-
 demuxer=rt
 sp --enable-decoder=h264 --enable-zlib
   libavutil      52. 18.100 / 52. 18.100
   libavcodec     54. 92.100 / 54. 92.100
   libavformat    54. 63.104 / 54. 63.104
   libavdevice    54.  3.103 / 54.  3.103
   libavfilter     3. 42.103 /  3. 42.103
   libswscale      2.  2.100 /  2.  2.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  2.100 / 52.  2.100
 [video4linux2,v4l2 @ 0x1de1be0] Raw       :   yuyv422 :  4:2:2, packed,
 YUYV :
 /dev/video0: Immediate exit requested
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2404#comment:2>
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