DivX 4 & AC3 sync trouble

4lex · 19th December 2001, 11:25

I've made an AVI with AC3 audio stream using Flask to compress the video and extract the audio, and Nandub to mux the audio in. Try as I might I can't seem to get the audio synced, it seems to be going in and out of sync as the movie plays, the offset not remaining constant.

I tried interleaving the audio at default settings, and every 64/96ms as doom9 suggests in his guide, but still no dice. Can anyone suggest what I might have done wrong?

Many thanks,
Alex

4lex · 20th December 2001, 12:59

any suggestions?

20th December 2001, 14:11

... download PowerDivX 3.11 from Doom9 and set AC3 output device to 'default WAV out device' and report what happens ...

4lex · 20th December 2001, 14:56

OK, will do, thx. I'm out on the p155 til saturday though, so I'll post back then.

4lex · 24th December 2001, 01:15

Quote:

Originally posted by ChristianHJW
... download PowerDivX 3.11 from Doom9 and set AC3 output device to 'default WAV out device' and report what happens ...

Hmm - not much. In fact nothing at all - I'm getting AC3 output on my SB Live device from BSPlayer, but no sound at all from PowerDivX

-edit-
Duh, what an idiot. I had the volume at zero...... sometimes overlook the simplest things. Still having the sync problem though

-edit-

MaTTeR · 24th December 2001, 02:40

Did you try the default interleave settings by chance? 500/1 works me.

4lex · 24th December 2001, 10:48

Yeah, tried that, and plenty others. Seems 40/40ms works best, with a delay offset of 150ms, however it seems the audio track is ever so slightly 'stretched' if that's possible, and the sync delay is very slowly growing throughout the playing time until it's about 600ms delayed by the end of the movie.

pdontthink · 19th January 2002, 12:22

4lex, did you reslove your problem?
was it cuz you were using Flask (said
to have synch issues)?? i have what
i think might be the same 'growing
synch' problem, so i'd be curious to
hear what you did.

19th January 2002, 14:37

@4lex :

In PowerDivX try to set your AC3 audio to 'Default Wave Out' instead of using DirectShow sound and report whats happening ...

4lex · 21st January 2002, 22:48

Thanks for the replies, it seems the issue is indeed PowerDivX related, as the sync issue isn't evident in wmp, but I can't figure out how to get ac3 audio from wmp.

Sadly my main rig is down at the moment as I'm missing a graphics card which I RMA'd over a month ago, so I haven't tried anything else recently, this c533 rig is pitifully slow

MaTTeR · 21st January 2002, 23:17

Hmmm...the new 3.12 PowerDivX doesn't give me sync issues anymore.

Did you try ZoomPlayer?

pdontthink · 21st January 2002, 23:39

Strange, you should be able to get ac3 sound in
WMP easily, just make sure the audio filters from
doom9's software page are installed. I can get
perfect sound in WMP, that is until I make an avi
with two audio tracks, then it, ZoomPlayer, and
PowerDivX start crashing like mad...

also, some good manual synch ideas are at:
http://www.doom9.org/virtualdub_procedures.htm#mansynch

19th December 2001, 11:25	#1 \| Link
4lex Registered User Join Date: Dec 2001 Posts: 36	DivX 4 & AC3 sync trouble I've made an AVI with AC3 audio stream using Flask to compress the video and extract the audio, and Nandub to mux the audio in. Try as I might I can't seem to get the audio synced, it seems to be going in and out of sync as the movie plays, the offset not remaining constant. I tried interleaving the audio at default settings, and every 64/96ms as doom9 suggests in his guide, but still no dice. Can anyone suggest what I might have done wrong? Many thanks, Alex

21st January 2002, 23:17	#11 \| Link
MaTTeR AC3 5.1 Addict Join Date: Nov 2001 Location: Big Blue Nation_USA Posts: 2,036	Hmmm...the new 3.12 PowerDivX doesn't give me sync issues anymore. Did you try ZoomPlayer? __________________ Need AC3 & SPDIF setup info?

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20th December 2001, 12:59	#2 \| Link
4lex Registered User Join Date: Dec 2001 Posts: 36	any suggestions?

20th December 2001, 14:11	#3 \| Link
ChristianHJW Guest Posts: n/a	... download PowerDivX 3.11 from Doom9 and set AC3 output device to 'default WAV out device' and report what happens ...

20th December 2001, 14:56	#4 \| Link
4lex Registered User Join Date: Dec 2001 Posts: 36	OK, will do, thx. I'm out on the p155 til saturday though, so I'll post back then.

24th December 2001, 02:40	#6 \| Link
MaTTeR AC3 5.1 Addict Join Date: Nov 2001 Location: Big Blue Nation_USA Posts: 2,036	Did you try the default interleave settings by chance? 500/1 works me.

24th December 2001, 10:48	#7 \| Link
4lex Registered User Join Date: Dec 2001 Posts: 36	Yeah, tried that, and plenty others. Seems 40/40ms works best, with a delay offset of 150ms, however it seems the audio track is ever so slightly 'stretched' if that's possible, and the sync delay is very slowly growing throughout the playing time until it's about 600ms delayed by the end of the movie.

19th January 2002, 12:22	#8 \| Link
pdontthink Registered User Join Date: Jan 2002 Posts: 101	4lex, did you reslove your problem? was it cuz you were using Flask (said to have synch issues)?? i have what i think might be the same 'growing synch' problem, so i'd be curious to hear what you did.

19th January 2002, 14:37	#9 \| Link
ChristianHJW Guest Posts: n/a	@4lex : In PowerDivX try to set your AC3 audio to 'Default Wave Out' instead of using DirectShow sound and report whats happening ...

21st January 2002, 22:48	#10 \| Link
4lex Registered User Join Date: Dec 2001 Posts: 36	Thanks for the replies, it seems the issue is indeed PowerDivX related, as the sync issue isn't evident in wmp, but I can't figure out how to get ac3 audio from wmp. Sadly my main rig is down at the moment as I'm missing a graphics card which I RMA'd over a month ago, so I haven't tried anything else recently, this c533 rig is pitifully slow

21st January 2002, 23:39	#12 \| Link
pdontthink Registered User Join Date: Jan 2002 Posts: 101	Strange, you should be able to get ac3 sound in WMP easily, just make sure the audio filters from doom9's software page are installed. I can get perfect sound in WMP, that is until I make an avi with two audio tracks, then it, ZoomPlayer, and PowerDivX start crashing like mad... also, some good manual synch ideas are at: http://www.doom9.org/virtualdub_procedures.htm#mansynch