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DIVX files with drifting AUDIO SYNCH problem on standalone
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LisaB
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Joined: 17 Jun 2002
Location: United States
Post Posted: Jun 24, 2004 09:42 Posts Comp View users profile Send private message Reply with quote
Maybe someone else has experienced this. I have the phillips dvp642, but I think anyone who knows a lot about AVI structure should be able to help.

I have a few AVI's that play fine on the computer, but on the standalone, the audio will slowly drift out of synch. By doing a quick fast forward or rewind for just a second, and then resuming play, the audio is brought back into synch....but after about 3-4 minutes it is noticeably out of synch again.

I have tried converting the audio (originally VBR MP3) to CBR MP2 and to CBR AC3. I interleave the audio with the video using VDubMod. Both MP2 and AC3 still give me the same result - drifting audio synch that can be brought back in synch by seeking.

I am beginning to think that there is something funky about the video stream, and that *any* audio which I combine with this video will result in the same behavior. I have scanned for bad video frames, and found none.

Does anyone have any ideas here, or could at least explain why FF/RW would restore (temporarily) audio synch? I was thinking maybe that the frequency of keyframes was not enough, but then wouldn't the audio be brought back in synch at each keyframe?

Xtropy
Member


Joined: 14 Apr 2004
Post Posted: Jun 24, 2004 11:36 Posts View users profile Send private message Reply with quote
Maybe you are using VBR MP3 stream? I am not an expert in the matter but when I've had audio sync change during the video it's because of a corruption at some point in the file or it could be a variable bit rate problem. Have you tried to re-encode the audio in CBR MP3 mode?

X

Suntan
Member


Joined: 14 Oct 2003
Post Posted: Jun 24, 2004 11:44 Posts Comp View users profile Send private message Reply with quote
I agree with Xtropy, I would either convert the audio to CBR MP3 from the original source (prefered) or convert the VBR MP3 you have to WAV then convert that to CBR MP3. Then I would mux it with the video stream with aviMUX_GUI instead of Vdubmod.

-Suntan

LisaB
Member


Joined: 17 Jun 2002
Location: United States
Post Posted: Jun 24, 2004 22:01 Posts Comp View users profile Send private message Reply with quote
No luck yet.

Extracted the audio to WAV, converted to CBR MP3, still the same problem on the standalone only.

I had to use VDUBMod to mux, however, since aviMUX_GUI produced an avi which actually locked up my standalone!

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