Posted by Rick Merrill on 11/30/05 03:09

docsavage20@yahoo.com wrote:
> Rick Merrill wrote:
>
>>Doc wrote:
>>
>>>You may have seen my other thread re: OOS audio problems. To recap, when
>>
>>Are you describing a situation where the audio winds up LEADING the video?
>
>
> Yes.
>
>
>>>recording to h/d via Firewire passthrough from analog VCR through a Sony
>>>Dig8 cam, the audio gets out of sync, it gets progressively worse the
>>>farther into the program you get.
>>
>>Could it be that the Sony has a sample rate of 44.1 on the audio, but
>>the playback of the recording made via firewire plays the audio back
>>at 48 kbps (kilobits per second)? If so, it will play back faster than
>>it was recorded! You see where this goes?
>
>
> Hmm...I was under the impression that DV audio is universally 48 khz (I
> assume you mean the 44.1/48 khz sample rate, not kbps)

Aiee, you're right.

> I see that the
> input parameters under DV capture show 48 khz as the audio rate. I
> assumed that the camcorder's output on passthrough would be the same as
> whatever it is when recording/playing back a tape recorded in Dig8
> format. But it's certainly an issue worth exploring if it explains the
> problem.
>
> Again, the thing that makes me scratch my head is that it didn't do
> this before I reinstalled the O.S.
>
>
>>>I've made the discovery that this *doesn't* happen if instead of coming in
>>>from a VCR, I play a tape recorded in Dig8 format directly from the cam
>>>through the Firewire cable. No OOS audio. It also doesn't happen when
>>>recording directly from VCR to the h/d in mjpeg format via the composite
>>>analog inputs.
>>
>>Good job finding a possible solution. You did mean "MPEG" format, yes?
>
>
> Perhaps my understanding of the distinction between mpeg and mjpeg is
> fuzzy.
>

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