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

FFmpeg trac at avcodec.org
Thu Mar 28 12:06:00 CET 2013

#2404: When the video with "white background" the display is gray
             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       |

Comment (by cehoyos):

 Replying to [comment:2 Ken_JJ]:
 > Replying to [comment:1 cehoyos]:
 > > Do you think this is a regression?
 > 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.

 Allow me to try again:
 Does it work with an older version of FFmpeg?
 If yes, the problem would be a regression and that would make the ticket

 > > Is the problem only reproducible if you use an external library
 (libx264) or also with a native encoder?
 > 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

 libx264 is an external library, problems that are only reproducible with
 external libraries are generally more difficult to fix than issues that
 are also reproducible without using an external library. FFmpeg should
 always come with native encoders, please test "-vcodec mpeg4"

 > > Is it reproducible with current git head?
 > 3.I get from the relase "http://ffmpeg.org/releases/ffmpeg-1.2.tar.bz2"

 Please test current git head.

 > > Is audio necessary to reproduce the problem?
 > 4.Audio is perfet.

 But is audio necessary to reproduce the problem you see, or does the
 problem also occur if you use "-an"?

 > > What happens if you remove "-s 720:480" from your command line?
 > 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.

 I am not sure I understand:
 Is your problem (that the image gets gray iiuc) also reproducible if you
 remove "-s 720:480"? Or does the display only gets gray if you specify a
 resolution of "-s 720:480" in your command line?

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2404#comment:3>
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