Re: AVI Video/Sound Jumping
From: Jake (jake_at_~nospam`.jake.org.uk)
Date: 03/10/04
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Date: Wed, 10 Mar 2004 09:36:37 -0000
Hi Ron
This problem surfaces about once per week. It doesn't affect everybody (but
it does affect me) and nobody knows why so far. But I have a theory, which
I can't prove unfortunately, but it's still a theory anyway...
It's not possible to synchronise audio and video in MiniDV format, i.e.
there is no "anchor" to say which audio portion belongs to which video
frame. All they have in common is the DV timecode.
When you edit your clips in MM2, you're generally going to do things like
adjust the length of the clips that you've captured - after all, that's what
it's all about! However, here's where I think things start to get a little
jittery. I think that MM2 doesn't handle edits too well. It uses an
editing workspace that's 12.5 frames per second (PAL) or 15 frames per
second (NTSC) which is half the frame rate of the DV format that you're
working with. The trade off is that it allows you to view a real-time
preview of your project without having to re-render clips that you've added
effects and transitions to. My theory is that it also introduces the
possibility that the audio and video become unsynchronised (I don't know why
this should be) but it's a known phenomenon that when this happens to DV you
hear the characteristic pops, hiccups and stutters that you refer to.
It's an annoying problem, and although it only hiccups for a fraction of a
second it can ruin your work. I had to stop using MM2 as a result.
Jake
"Ron" <anonymous@discussions.microsoft.com> wrote in message
news:1D65BB2A-5623-4C25-B67A-85248112A027@microsoft.com...
> I have imported DV as AVI file, edited movie and now time to save back as
an AVI file so I can convert it to a DVD MPEG so I can burn it to DVD. My
problem is whenever I save movie files as AVI files, at certain points in
the video, the video/audio "jerks", "hiccups", "stutters" etc. I have even
saved them multiple times and they always jump in the same exact place. But
whenever I save it in any WMV format, it plays back just fine. Any ideas
what is going on?...I'm running Home XP, and have a brand new AMD Athlon 3
GHz with 768 MB RAM and a 200GB HD, so I don't think my pc is to blame. Any
help is appreciated!
- Next message: John Kelly: "Re: AVI Video/Sound Jumping"
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