[MPlayer-dev-eng] Smeared video with screenshot and unsharp filter

[Nicolas George]

Le septidi 7 germinal, an CCXXI, Ingo Brückl a écrit :
> After updating ffmpeg today (for the first time in 2 months), I'm
> experiencing filter problems again. (We already had that a few times in the
> past.) There is a flickering in the video's upper part and then it gets
> smeared. (Sample will be provided.) MPlayer with the January ffmpeg runs
> fine. (I hate updating ffmpeg.)
> 
> I'm also experiencing (unfortunately non-reproducible) very seldom crashes.
> (I will provide further information if I can get a crash on the command
> line.)
> 
> There is a "[VD_FFMPEG] DRI failure." message which seems to be new.
> 
> My command line is:
> 
>   mplayer -noconfig all -vf-add screenshot -vf-add unsharp=l7x7:1.7

I can confirm the same problem with "-vf screenshot,pp=hb:c/vb:c/lb" (or
other pp options), but it also happens with rectangle=10:10:10:10, mirror,
etc. The common culprit seems to be screenshot before a frame-modifying
filter.

It can be reproduced using a test video from ffmpeg (the first artifact is
visible at the fourth image):

ffmpeg -filter_complex '                    
color=c=black:d=20:r=2,
drawtext=text=@:x=32:y=-24+10*t:fontsize=240:fontcolor=yellow
' -g 2 -y t.avi

I have not yet had time to investigate further, but I know from a fact that
I do not understand the various image types MPlayer uses. If someone could
write a bit of documentation, that would be a great help.

Regards,

-- 
  Nicolas George
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