AVI audio delay

Andrey · 23rd March 2004, 12:14

Hi !
Is there any way to find audio delay defined for 2nd audio stream in avi ?
Thanks in advance !

Abond · 23rd March 2004, 17:42

did you try GSpot?

Andrey · 23rd March 2004, 22:19

Yep.
May be I'm too tired now

(some this week problems allow me to sleep no more than 5h a day) but I do not see any delay info in audio prperties GSpot shows me...

Abond · 24th March 2004, 10:08

At the field Streams and Interleaving there is a window marked as I/L where is written some info and also something like "p=480" or "N=420". This is the delay in ms p=positive, n=negative. For the second audio obviously you should click on the audio field at 2/ (or something like that) and to look for interleaving info in I/L window. I think this is how to, but I haven't ATM avi with two streams to check.

Andrey · 24th March 2004, 12:43

Oh.
I've checked another avi, this data is presented.
But when I check my avi, the next info appears:
Type: OpenDML AVI, "rec list" style
I/L: Not supported.

So, I'm not blind

Hm. I see two possible reasons for that:
1st. I've created this file with AViMuxGUI (last version).
2nd. Two audio streams are of aac type.

Ok. Seems that I should find actual delay by myself again.
FYI:

The reason for all this:
I've TV show compressed. With two streams: English and translation in my native. Now I've found a better quality source of translation. I've compared them - source is the same. So I manage to replace it with new and better one.

But now I need to find an actual delay again... Shit.

Abond · 24th March 2004, 13:24

Ah, I see. May be the problem is that avi doesn't support more than one audio natively (AFAIK). Well, may be VDubMod will give you some information (File-File information). If not, try to remux the file disabling the audio you are not interested in and try again with GSpot or VDubMod.

Andrey · 24th March 2004, 16:21

I knew that VDubMod cannot remux file with aac audio.
But you give me idea...
I've tried NanDub.
It can do it, but then audio info is either lost or wrong.
At least, no player plays the audio

,GSpot and dubs show some info, but not a delay.
AVIMuxGUI when remuxing does not maintain delay info.

alexnoe · 10th April 2004, 20:35

Most programs, including avi-mux gui and vdub(mod) don't allow any delay to be stored in avi files. They rather pad with silence or remove the beginning of the audio stream. Therefore, there is nothing to keep.

Quote:

May be the problem is that avi doesn't support more than one audio natively (AFAIK)

A lie of a few people trying to propagate OGM. AVI natively supports 99 audio streams.

Matthew · 11th April 2004, 03:59

No doubt this won't help, but for AC3 you can calculate the delay by running the AC3 through besplit/besliced and recording "sync found after XYZ bytes". Divide XYZ by the 4*bitrate and multiply by 32 ms. All this is doing is calculating the length in ms of the partial frame at the beginning.

@alexnoe, with MP3 that silence is lost when demuxing though, right? I must say I'm really surprised that there is no method available to calculate the delay. Fairly recently I had a ~1000 ms delay on an avi and manually syncing after re-encoding was really annoying.

alexnoe · 11th April 2004, 09:59

If you muxed it with VDub(Mod) or NanDub, and demux with AVI-Mux GUI, then the delay will be lost.
Reason: VD(M)/ND insert some crap, instead of valid MP3, which AVI-Mux GUI removes if you process such a file.

If you mux with AVI-Mux GUI, valid MP3 data will be used to insert the delay, meaning that it will be preserved when demuxing.

Matthew · 13th April 2004, 05:45

That's pretty nifty on your part

But nandub is still very commonly used by others, so would be nice to be able to detect the delay (i.e. determine ms via length of junk). Humbug.

23rd March 2004, 12:14	#1 \| Link
Andrey Registered User Join Date: May 2003 Location: Riga, Latvia Posts: 186	AVI audio delay Hi ! Is there any way to find audio delay defined for 2nd audio stream in avi ? Thanks in advance !

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23rd March 2004, 17:42	#2 \| Link
Abond Registered User Join Date: Jun 2002 Posts: 416	did you try GSpot?

23rd March 2004, 22:19	#3 \| Link
Andrey Registered User Join Date: May 2003 Location: Riga, Latvia Posts: 186	Yep. May be I'm too tired now (some this week problems allow me to sleep no more than 5h a day) but I do not see any delay info in audio prperties GSpot shows me...

24th March 2004, 10:08	#4 \| Link
Abond Registered User Join Date: Jun 2002 Posts: 416	At the field Streams and Interleaving there is a window marked as I/L where is written some info and also something like "p=480" or "N=420". This is the delay in ms p=positive, n=negative. For the second audio obviously you should click on the audio field at 2/ (or something like that) and to look for interleaving info in I/L window. I think this is how to, but I haven't ATM avi with two streams to check.

24th March 2004, 12:43	#5 \| Link
Andrey Registered User Join Date: May 2003 Location: Riga, Latvia Posts: 186	Oh. I've checked another avi, this data is presented. But when I check my avi, the next info appears: Type: OpenDML AVI, "rec list" style I/L: Not supported. So, I'm not blind Hm. I see two possible reasons for that: 1st. I've created this file with AViMuxGUI (last version). 2nd. Two audio streams are of aac type. Ok. Seems that I should find actual delay by myself again. FYI: The reason for all this: I've TV show compressed. With two streams: English and translation in my native. Now I've found a better quality source of translation. I've compared them - source is the same. So I manage to replace it with new and better one. But now I need to find an actual delay again... Shit.

24th March 2004, 13:24	#6 \| Link
Abond Registered User Join Date: Jun 2002 Posts: 416	Ah, I see. May be the problem is that avi doesn't support more than one audio natively (AFAIK). Well, may be VDubMod will give you some information (File-File information). If not, try to remux the file disabling the audio you are not interested in and try again with GSpot or VDubMod.

24th March 2004, 16:21	#7 \| Link
Andrey Registered User Join Date: May 2003 Location: Riga, Latvia Posts: 186	I knew that VDubMod cannot remux file with aac audio. But you give me idea... I've tried NanDub. It can do it, but then audio info is either lost or wrong. At least, no player plays the audio ,GSpot and dubs show some info, but not a delay. AVIMuxGUI when remuxing does not maintain delay info.

11th April 2004, 03:59	#9 \| Link
Matthew jdgljlfljg Join Date: Jan 2002 Location: Tony Abbott's electorate Posts: 1,393	No doubt this won't help, but for AC3 you can calculate the delay by running the AC3 through besplit/besliced and recording "sync found after XYZ bytes". Divide XYZ by the 4*bitrate and multiply by 32 ms. All this is doing is calculating the length in ms of the partial frame at the beginning. @alexnoe, with MP3 that silence is lost when demuxing though, right? I must say I'm really surprised that there is no method available to calculate the delay. Fairly recently I had a ~1000 ms delay on an avi and manually syncing after re-encoding was really annoying.

11th April 2004, 09:59	#10 \| Link
alexnoe Banned Join Date: Aug 2002 Location: Germany Posts: 1,737	If you muxed it with VDub(Mod) or NanDub, and demux with AVI-Mux GUI, then the delay will be lost. Reason: VD(M)/ND insert some crap, instead of valid MP3, which AVI-Mux GUI removes if you process such a file. If you mux with AVI-Mux GUI, valid MP3 data will be used to insert the delay, meaning that it will be preserved when demuxing.

13th April 2004, 05:45	#11 \| Link
Matthew jdgljlfljg Join Date: Jan 2002 Location: Tony Abbott's electorate Posts: 1,393	That's pretty nifty on your part But nandub is still very commonly used by others, so would be nice to be able to detect the delay (i.e. determine ms via length of junk). Humbug.