Well, I've seen a number of threads about this but no clear resolution. Recently I've been trying to transocde a 720p MP2 file to MP4 with a cutlist. The file is 4 hours long -- 22 gigabytes, and it has a whopping 76 minutes of "cuttable material", so use of a cutlist is pretty important.
However, the result had steadily worsening audio sync, getting over a second off eventually. I used divx bucause xvid was so slow (4fps on a 60fps recording) that it would take at least 33 hours to transocde even on a fast machine. That's with ffmpeg, should I try transcode? (mencoder does not work yet). Even dvix took over 8 hours to transcode, but that's a touch more tolerable. Worse, while this is 60fps, it's really 24fps underneath, most frames are duplicates. Alas the mythtransocde | ffmpeg approach presumably doesn't allow the encoder access to the knowledge it's just been handed an exactly duplicate frame and shouldn't waste its time. To my surprise, also, while I asked for a bitrate of 7200, which should have generated a file in the range of 9 gigabytes, I got one that was 4 gigabytes. It is actually pretty good, video wise, though with some obvious artifacts in smooth surfaces and a little blurring. But I felt I was willing to spend more space on it and hopefully be rid of those.
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