[mythtv] Aspect Change problems
Derek Atkins
warlord at MIT.EDU
Sat Nov 22 14:02:22 EST 2003
"Edward Wildgoose" <edward.wildgoose at frmhedge.com> writes:
> Just to confirm that I tried the latest CVS and it still have the problem
> with that wierd jitter developing after any change in aspect ratio in the
> source stream. The problem with cvs seems to be in
> VideoOutput::InputChanged, something in there to do with resetting video
> buffers is causing something which triggers this jitter. The effect is very
> odd, video frames jitter forwards and backwards in time...
I'm seeing that same behavior here -- not with an aspect change but
with a damaged video frame. I've got a test video if anyone wants a
copy (it's 300MB, but I'll happily press onto a CD and send it if you
want to see the problem).
Basically, I get:
[mpeg1video @ 0x89b9f78]ac-tex damaged at 2 26
[mpeg1video @ 0x89b9f78]concealing errors
[mpeg1video @ 0x89b9f78]Warning MVs not available
[mpeg1video @ 0x89b9f78]slice below image (69 >= 30)
[mpeg1video @ 0x89b9f78]slice below image (37 >= 30)
[mpeg1video @ 0x89b9f78]slice below image (55 >= 30)
[mpeg1video @ 0x89b9f78]concealing errors
[mpeg1video @ 0x89b9f78]slice below image (38 >= 30)
[mpeg1video @ 0x89b9f78]concealing errors
And then the jitter starts.. If I can jump past the "bad frame" then
it doesn't jitter.
Strangely, this problem ONLY occurs in Myth with software decode. I
can use mplayer and the video is just fine (even when I force the
ffmpeg a/v codecs). Also, output to a pvr-350 works fine, with a
small correction around when the video is damaged.
-derek
--
Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
Member, MIT Student Information Processing Board (SIPB)
URL: http://web.mit.edu/warlord/ PP-ASEL-IA N1NWH
warlord at MIT.EDU PGP key available
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