[mythtv-users] x264, interlacing, and mythcommflag --rebuild

[belcampo]

Gavin Peters wrote:
> Folks,
> 
> There's a few parts to my question, but I think they're related and of
> general interest.  I'm trying to archive some older SD content that
> got broadcast to me in 1080i.  So, I run something like:
> 
> mencoder $INPUT -oac copy -ovc x264 -vf crop=1440:1080,scale=640:480:1,il=2,harddup -x264encopts bitrate=$BITRATE:pass=1:turbo=2:partitions=none:qcomp=0.7:bframes=2:b_pyramid:threads=4:interlaced -lavdopts threads=1 -o /dev/null
> mencoder $INPUT -oac copy -lameopts preset=medium -ovc x264 -vf crop=1440:1080,scale=640:480:1,il=s,harddup -x264encopts bitrate=$BITRATE:pass=2:qcomp=0.7:subq=6:frameref=3:partitions=all:8x8dct:bframes=2:b_pyramid:threads=4:interlaced -lavdopts threads=1 -o $OUTPUT
> 
> And that works, at least it makes a quite playable video.  There's some things odd about
> the output file though:
> 
> Audio sync seems to go badly when I play it in the mythplayer; this
> isn't fixed by -mc 0 -noskip, or any variation thereon.  Oddly, the
> transcode duplicateds ~ 6 frames right up, then it just stops
> duplicating frames.  Very strange.
> 
> See the il=s in the -vf above?  Without that, the interiacing on the
> output file is backwards.  How weird is that???
> 
> And, after getting my output file, I try:
> 
> mv outputfile.avi original-show-file.mpg
You can't expect renaming an avi to mpg that mythcommflag can handle it 
as an mpg container. You'll have to remux it to an mpg container
> mythcommflag -f original-show-file.mpg --rebuild
> 
> and I get some output, but seeking doesn't work.  If I seek, the video
> is all crazy for a few seconds.  As well, the commercial break
> flagging seems nicely broked by my transcode.
> 
> Advice?
> 
> - Gavin
> 
> 
> 
> 
> 
> 
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