[MEncoder-users] is this possible

[Daniel Harris]

On Sun, Feb 27, 2011 at 3:31 PM, Reimar Döffinger
<Reimar.Doeffinger at gmx.de> wrote:
> On Sun, Feb 27, 2011 at 01:06:00PM +0000, Daniel Harris wrote:
>> I am trying to record some vhf tape to dvd but after trying what seems
>> like hundreds of combinations I still end up with a/v sync issues.
>> Over an hour the sync only seems to go out by about 100ms so I was
>> thinking about recording in 5 to 10 minute intervals and then cutting
>> and splicing the whole video back together again using scene changes
>> as markers.  Is that possible and is there a way to make mencoder
>> record for 5 or ten minutes and then fire up a second instance say
>> about 30 seconds before the first one ends.  I guess this would
>> require some sort of shell script?
>>
>> Would this be the best way to do this or is their a better way?
>
> What is your recording setup? This sounds like the audio and
> video capture use different clocks.
> I think there are only two mostly working solutions:
> 1) Get a capture solution that uses the same clock/quartz for
>   both audio and video.

I am using a kworld dvdmaker usb device that just about works with
mencoder and pretty much nothing else.  I very rarely use it so it is
the only hardware solution

> 2) Use -af scaletempo to slightly adjust audio speed up or down
>   to match the video. Not that for quality reasons I'd normally
>   suggest to just tweak the fps value, however if you want to
>   go to DVD you probably have no choice there and then adjusting
>   audio should work better than dropping or duplicating frames.

I will give it a go as at the beginning the sync is perfect so I just
need to stretch audio a fraction.

Thanks

Dan

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