Posted by Rick Merrill on 01/23/06 16:10

Biz wrote:

> "Rick Merrill" <rickZERODOTmerrill@NOSPAMgmail.com> wrote in message
> news:KeOdnanE3Y-Cx0zeRVn-rw@comcast.com...
>
>>Javaholics wrote:
>>
>>>It is NTSC...I converted two VHS tapes to MPEG-2 at 29.97fps. A preview
>
> of
>
>>>final product prior to burning, netted no discernable problems and
>
> appeared
>
>>>as expected. Only after the burning process, when I played the DVD, did
>
> I
>
>>>then notice the sync problem.
>>
>>Playing a DVD requires audio at a 41 KHz sampling rate, BUT MPEG-2 can
>>use 32 or 41 or (most likely) 48 KHz sampling rate. If that's the
>>problem then your sound should be BEHIND the video. Is your sound
>>ahead or behind the visual?
>>
>
>
> Close....Audio on a DVD must be 48khz, but mpeg can use several different
> sampling rates...The sampling rate should not affect teh sync, however some
> programs dont convert it properly, if its not already 48khz...
>
>

Yes, MPEG can use different rates as I said. But DVDs are at 41.1 KHz
sampling rate.

The way this affects the sync is if one rate is played back by tool that
requires (i.e. assumes) another rate. - once-bit-twice-shy

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