[MEncoder-users] Puzzle - Frame skipping and audio

[Joseph Eoff]

Hi.
Thanks for the offer.
I'm afraid it wouldn't do much good, though.  There are literally frames 
missing from the captured video, so that a conversion wouldn't be able 
to change things.

It seems to me that something in the settings I use causes problems when 
capturing - but only when capturing with a specific sound card.  If I 
leave the sound source as the default, it works fine.  If I monkey 
around my system and force the sound card from the digitizer to be the 
default, then that works fine, too.  I just can't use the system that 
way because the digitizer only has inputs and isn't connected all the 
time anyway.

What I'd really like is to understand why I get skips when I specify 
which sound card to capture from.  I don't know if I'm doing something 
wrong or if there's something wrong with my system or if there's bug in 
mencoder.

Joseph
> 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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>
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