Audio /Video Sync issues

manoflogan · 3rd December 2006, 03:36

When I run the vobs through DGIndex, I can demux the audio stream. However after using AVISynth, I find that there is an audio /video sync problem with it. I also found that the audio / video sync can be rectified by setting the mux delay in the other direction. That is , if the ac3 file shows a delay of -5ms, I add a delay of 5ms to remove the sync issue.

I dont know why this is happening. Can anybody help me here?

Guest · 3rd December 2006, 12:28

You can detect a desync of 5ms?! Please explain your methodology for that.

manoflogan · 6th December 2006, 08:55

I just play the file in media player classic, and delay the audio by positive and negative time.

Taurus · 6th December 2006, 09:27

It's almost impossible to hear an audio delay of -5ms.
The human ear starts recognizing time shifts @ +/-20ms.
This has been prooven a long time ago.
Maybe the latency of your soundcard or your player?

3rd December 2006, 03:36	#1 \| Link
manoflogan Registered User Join Date: Jul 2006 Posts: 95	Audio /Video Sync issues When I run the vobs through DGIndex, I can demux the audio stream. However after using AVISynth, I find that there is an audio /video sync problem with it. I also found that the audio / video sync can be rectified by setting the mux delay in the other direction. That is , if the ac3 file shows a delay of -5ms, I add a delay of 5ms to remove the sync issue. I dont know why this is happening. Can anybody help me here?

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3rd December 2006, 12:28	#2 \| Link
Guest Guest Join Date: Jan 2002 Posts: 21,901	You can detect a desync of 5ms?! Please explain your methodology for that.

6th December 2006, 08:55	#3 \| Link
manoflogan Registered User Join Date: Jul 2006 Posts: 95	I just play the file in media player classic, and delay the audio by positive and negative time.

6th December 2006, 09:27	#4 \| Link
Taurus Registered User Join Date: Mar 2002 Location: Krautland Posts: 903	It's almost impossible to hear an audio delay of -5ms. The human ear starts recognizing time shifts @ +/-20ms. This has been prooven a long time ago. Maybe the latency of your soundcard or your player?