[mythtv-users] Audio lags when transcoding 720p from cable box firewire

[belcampo]

Stephen Sassman wrote:
> I have been trying to transcode some 720p video captured from the
> firewire of my cable box (motorolla 6200 series). I am transcoding to
> x264 to a matroska container which works perfectly with my ivtv
> recordings. The problem that I am having is that the audio track lags
> behind the video, and it gets worse as the video progresses. By the end
> of a 90min movie, the audio can end up more than 10 sec behind the
> video. I have tried using avidemux, mencoder, and ffmpeg with the same
> result. Here is the command line that I'm using in mencoder:
> 
> mencoder file.mpg -vf crop=944:688:168:16 -ovc x264 -x264encopts
> subq=6:me=umh:8x8dct:partitions=all:bframes=3:frameref=3:mixed_refs:dct_decimate:threads=0:weight_b:crf=23
> -oac copy -o file.mkv
> 
> 
> I use similar settings with ffmpeg and avidemux. The original mpeg has
> no issues with audio sync. I have seen mention of similar problems, but
> never a clear solution. Any idea?
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mediainfo -f file.mpg
mediainfo -f file.mkv

What do they tell you about video- and audiolength.
Which one got shorter/bigger ?

belcampo