Re: Codec - Video and Sound out of sync
- From: "Ken Maltby" <kmaltby@xxxxxxxxxxxxx>
- Date: Wed, 24 May 2006 03:28:55 -0500
<tmuldoon@xxxxxxxxxxx> wrote in message
news:1148447095.414150.71610@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hello,
I have several .avi that I convert to mpeg2s, the put them through DVD
Architect to create DVDs.
Now when I play the .avi - the audio and video are in sync. When I
convert them to mpeg2 - SOME are not.
At the beginning the mpegs are fine...but as they progress the video
seems to creep ahead of the video. In some cases it gets to about 15
seconds ahead making watching it useless.
I have no idea what the cause is.
Is there some standard update to all video and audio codecs I should be
installing periodically to ensure my video and audio are in sync?
Any other suggestions?
MainConcept Mpeg Encoder
Tools - DVD Architect 2.0
Gspot Decoder
Thanks,
Tmuld
It's not likely that your video and audio being out of sync
is caused by the separate codec involved. There are two
places where your audio and video sync is being established
during the processing you describe. First as the MPEG is
being encoded, then as the audio stream(s) and the video
stream are muxed during the authoring process.
During the MPEG encoding there is sometimes a slight
difference in the frame rate between the source and the
MPEG being created. Another common cause of loss
of sync over time is the result of dropped frames during
the avi capture. (Frame serving to the MPEG Encoder
can sometimes eliminate this problem.) The avi will play
fine, due to the built-in correction in the PC playing
software, but the encoder will often have to encode it as
it sees it.
www.VideoReDo.com has a Quickfix tool that can redo
the timing data in the MPEG, this may be all the correction
you need. If the Authoring process were where the loss of
sync occurred the reapplied sync data will usually correct
the problem, as well.
If the timing data of the MPEG were off because the avi
were corrupted such that the keyframe data changed the
actual size of the audio and/or video frames ( as relates to
the time to play each one) then the MPEG encoder would
have seen the changing sync as valid and the sync data in
the MPEG would appear correct to Quickfix. To fix that,
VRD has another tool that lets you adjust the sync manually.
Try using the free trial to correct your MPEG.
Luck;
Ken
.
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