I'm looking for the select group of crazy people out there. You know who you
are, the ones running interlaced recordings (recorded from SDTV) interlaced to
an interlaced output (TV). I can't imagine there are many of us... but I beg
your help.
My recordings from TV on Freevo are beautiful (given the bitrate I'm devoting
to it). They play back smooth... except every once in a while, they get
jittery. Having a background in TV production, I recognize this is reversed
fields in interlaced playback, as opposed to some kind of encoding artifact. If
I pause Freevo/Mplayer and then resume, everything is back to normal. Or
sometimes if I let it go long enough, it will correct itself.
It's a minor annoyance... either I have to quickly pause/unpause, or if I'm
watching with someone else I'll just grit my teeth and bear it until it
corrects itself.
What I think is happening is for some reason, mplayer decides it needs to drop
a frame, but instead it drops a field, so now the field-order is reversed. And
once it's paused, it starts off in the correct order again. This could make
sense if mplayer treats interlaced playback as 60fps where each 'frame' is one
of the fields.
I tried adjusting the -autosync value and it seemed to help, but it still
doesn't make it bulletproof. If it is a matter of mplayer dropping
fields/frames, I'd like to know what's causing it. I have an XP1900+ with 512M
of ram and a G400Max video card... unless my hard drive is the bottleneck I
can't see any reason it should choke. But perhaps I'm missing something.
Again, thanks for any help anyone can offer, or any directions to pursue
research. Not a deal-breaker, but fixing this would make playback perfect.
James
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