[MEncoder-users] Puzzle - Frame skipping and audio

[L. Lee]

My digitizer only transmits with with pulldown, either 1080i or 720p,
depending on the source. Can you capture to a file with no filters or
cropping? If you'll publish a clip somewhere, I'll have a crack at
converting it.

Laine Lee

On 5/28/11 10:34 AM, "Joseph Eoff" <joseph.eoff at molear.de> wrote:

> Hi.
> 
> I've found that mencoder works really well for digitizing the tapes from
> my analog video camera.  With the cropping and deinterlacing mencoder
> does, the resulting clips look really good on the computer screen.
> 
> I recently bought a new digitizer - the old one was ten years old and
> just gave up the ghost.  The new digitizer connects via USB and has a
> built in sound card.  I would rather connect all of my video camera
> cables to just the digitizer box instead of connectig the video the
> digitizer and the audio to my sound card, so I changed my normal
> configuration to use the new sound card instead of taking the default
> and using the sound card built into the computer.
> 
> Recording with the sound card explicitly set causes frame skips - LOTS
> of frame skips, to the point that the resulting video is completely useless.
> 
> At first I thought is was a problem with the new digitizer, but the same
> thing happens if I specify the sound card built into the computer.
> 
> The normal capture looks like this:
> mencoder -tv 
> driver=v4l2:width=720:height=576:input=2:outfmt=i420:norm=pal:immediatemode=0:
> forceaudio 
> -oac mp3lame -lameopts cbr:br=128 -mc 0 -ovc lavc -lavcopts
> vcodec=mpeg4:vbitrate=8000 -vf crop=700:542:12:16,pp=lb,harddup -o
> capture.avi tv://
> 
> That command uses the new video digitizer on /dev/video0 and the sound
> card built into the computer.
> mencoder -tv 
> driver=v4l2:width=720:height=576:input=2:buffersize=256:outfmt=i420:norm=pal:i
> mmediatemode=0:forceaudio
> -oac mp3lame -lameopts cbr:br=128 -mc 0 -ovc lavc -lavcopts
> vcodec=mpeg4:vbitrate=8000 -vf crop=700:542:12:16,pp=lb,harddup -o
> capture.avi tv://
> 
> This one explicitly sets the same audio source, but skips like mad and
> produces a completely unusable video:
> mencoder -tv 
> driver=v4l2:width=720:height=576:input=2:buffersize=256:outfmt=i420:norm=pal:a
> lsa:adevice=hw.0:immediatemode=0:forceaudio
> -oac mp3lame -lameopts cbr:br=128 -mc 0 -ovc lavc -lavcopts
> vcodec=mpeg4:vbitrate=8000 -vf crop=700:542:12:16,pp=lb,harddup -o
> capture.avi tv://
> 
> Does anyone see what I'm doing wrong to make mencoder skip when
> explicitly setting the audio source?
> 
> Joseph Eoff
> 
> 
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