Videos without audio delay?

[balazer]

I have a number MPEG-2 files for which DVD2AVI reports the audio offset as 0 ms, when it should be something on the order of -500 ms. This is true for all the versions of DVD2AVI that I tried, including Tom Barry's, command-line, and Donald Graft's 1.0.0.

If I posted a short sample, would someone be willing to take a look?

Thanks,
Jacob

[neuron2]

Originally posted by balazer
I have a number MPEG-2 files for which DVD2AVI reports the audio offset as 0 ms, when it should be something on the order of -500 ms. This is true for all the versions of DVD2AVI that I tried, including Tom Barry's, command-line, and Donald Graft's 1.0.0.

If I posted a short sample, would someone be willing to take a look?
Sure, I'll have a look if you post a link. But if all the apps report 0ms, it is probably just encoded with a hard desync. How are you getting these files?

And BTW, this should be a new thread.

[hakko504]

Originally posted by neuron2
And BTW, this should be a new thread. Now it is :)

[balazer]

What is a hard desync?

This clip doesn't work with all DirectShow MPEG-2 demux filters, so maybe the problem is bigger than I thought (though DVD2AVIdg & mpeg2dec3dg have no problems decoding it):

http://www.eecs.umich.edu/~balazer/test2.mpg

The problem clips are all recorded from satellite.

Thanks.

[neuron2]

Hard desync means that even if you present both the video and the audio at their stream-defined presentation time stamps, there is still audio/video desync. That means the desync must have been present prior to MPEG encoding. If it is a constant offset, you can easily correct for it in most applications.

Please specify the DirectShow decoder that fails and describe the failure as fully as you can.

[trbarry]

balazer -

Just to clarify, when you try the various version of DVD2AVI that support this, are you feeding DVD2AVI an original transport stream of some sort or has it been stripped or processed by some other utility first?

- Tom