[Mplayer-advusers] ffmjpeg DR? bug

[Michael Niedermayer]

Hi

On Tuesday 04 November 2003 22:18, rsnel at cube.dyndns.org wrote:
> Hello,
>
> See ffmjpeg-DR-bug.avi in MPlayer/incoming/.
> (ffmjpeg-DR-bug.txt doesn't contain the disassembly
> and the register info, this mail does)
>
> Description:
>
> when I play ffmjpeg-DR-bug.avi with mplayer, mplayer
> crashes with signal 11.
>
> If I remove CODEC_CAP_DR1 from AVCodec mjpeg_decoder; in
> libavcodec/mjpeg.c, the crash disappears.
>
> Using --disable-mmx makes no difference.
>
> My guess is that it has someting to do with the colorspace
> of the JPEGS inside. (YUV422, instead of the more common YUV420).
hmm the chroma stride returned by mpcodecs_get_image() suddenly doubles before 
the crash, so this doesnt seem to be a libavcodec bug, and no, the stride 
doublng code at line 730 in vd_ffmpeg isnt it, as it happens with that 
commented out too

[...]
-- 
Michael
level[i]= get_vlc(); i+=get_vlc();		(violates patent EP0266049)
median(mv[y-1][x], mv[y][x-1], mv[y+1][x+1]);	(violates patent #5,905,535)
buf[i]= qp - buf[i-1];				(violates patent #?)
for more examples, see http://mplayerhq.hu/~michael/patent.html
stop it, see http://petition.eurolinux.org & http://petition.ffii.org/eubsa/en