Urgent prob!!

[macleod]

I have been reading this post for a little while now. The thing that I see is that it starts out as a audio sync issue from a cap of some kind with powervcrII and then all the other details gets a little fuzzy. I am going to (for now) leave my personal feelings on the other parts of this topic to myself and try to help the person...

Could you post EXACTLY what you have done and EXACTLY what you are trying to do and EXACTLY what the issue is. When you are writing your response, dont think "oh yea, they'll know this". Here is what I gather, you did a capture with powervcrII and are trying to convert to an AVI (as a previous poster mentioned, I have no idea as to why, but anyway). The audio over x period of time starts to sync issue. If it is a gradual sync issue, well, your screwed. More than likely is the X dropped frames over X period of time, however, audio was keeping up or lagging behind. You'll need to go into the audio file and edit it when it gets out of sync. Plain and simple.

another possibility however is that the file that you had gets broken up into chunks (650 meg, I believe) by powervcrII. Is that what happened and you joined them OR did you do the registry hack to make it one big file. In your response, please give the specs of the file you are starting with.

[bugster]

I ain't really converting MPEG2 to avi,I actually add some filters to it in vdub and then encode it in xvid 900

I would call that a conversion!

Your problem sounds like it might well be dropped frames in the original capture. Try this to determine if this is the case:

Use TmpGenc, mpeg tools, simple de-multiplex. Select your mpeg file as source and generate a .m2v video file and .mp2 audio file. Now re-multiplex using tmpgenc mpeg tools multiplex option. Now play this new file. If this one is out of sync then the problem is with your source and the fact that you are dropping frames.

You see, (the way I understand it) an mpeg system stream contains timeing info that keeps the video and audio in sync during playback even when frames are missing. De-multiplex the two streams and this timing info is lost so when you re-multiplex the lost frames cause the loss of sync. Any form of editing, conversion or filtering is going to de-multiplex the two streams, at least within the software tool even if you do not see this.

Solution? All I can reccomend is to re-capture with a system that does not drop frames and preferably one that does not encode to mpeg-2 on the fly as this may well a part of the problem.

[darknavi]

Ok,since this is getting a little confusing,I will explain in detail this time.

First I capture in powervcr,highest quailty possible,uncompressed at 640X480.

Next,I did 2 things,one is I used TMPGEnc>MPEG tools>de-multiplex>save the mp2 file. Or Open the MPEG2 in vdubmod>streams>streams list>save wav.

From there,my audio file will usually be shorter than my video,almost always shorter by a few ms or seconds. My encoded video is also 1 frame lesser than the original MPEG2. So,next,I just add the wav I got from vdubmod and added it to the video,streams list>add and thats it,I tried audio skew correction,but like you said,the audio goes off to sync gradually. I tried correcting the length of the audio with goldwave>time warp,so they are both the same,but still doesn't work.

The audio sync is gradual,it slowly goes off sync. What should I do now?

[FOO]

First I capture in powervcr,highest quailty possible,uncompressed at 640X480.

Next,I did 2 things,one is I used TMPGEnc>MPEG tools>de-multiplex>save the mp2 file. Or Open the MPEG2 in vdubmod>streams>streams list>save wav.

You don't HAVE a mpeg2 . You said you captured uncompressed.

[presto]

Again, not one thing that Darknavi writes makes sense or is responsive.
Here is his explanation of why he couldn't come up with a better subject title than "Urgent Prob":

Besides,this isn't sync problem so....

From his first post in this thread:

how can I get the audio and video to sync? The audio syncs perfectly with no problem for the first 10 mins maybe but after that,it just slowly starts to go off sync. When I manage to sync the last half,the first half goes off sync.

[darknavi]

Ok,I am new to this stuff and I ain't sure whats going on. I guess MPEG2 is compress...but still,how can I fix the audio sync? I think its the interleaving thing that cause the problem. How can I just join the vid and audio together normally without the interleaving or audio skew or any other things? Just the normal "join wav to video"

Again, not one thing that Darknavi writes makes sense or is responsive.
Here is his explanation of why he couldn't come up with a better subject title than "Urgent Prob"

Presto: I KNOW thats a bad topic,what you want me to do? Create another topic just because some guy said its bad? Please,if you are here just to criticize my posts and correct me,its best you just ingore this topic since its so bad,just leave this topic alone ok? So what I make mistakes,does that prove you are really smart? I know I might seem like some newbie that knows nothing,etc. But trust me,I know much more than you think I do. You should just be an english teacher instead,correcting people mistakes. Or maybe you ain't qualified to be a teacher,thats probably why you are in this forum,correcting people to "make up" for how bad you are? Didn't meant to be this "rude" and stuff but...ingore this post if you ain't willing to contribute anything to help. Besides,I am sure you can find another guy to complain about. Good luck finding the other guy.

Ok then,what does "enable video/audio interleaving" in vdub means? Can that be the cause of the problem?

[presto]

Presto: I KNOW thats a bad topic,what you want me to do? Create another topic just because some guy said its bad? Please,if you are here just to criticize my posts and correct me,its best you just ingore this topic since its so bad,just leave this topic alone ok? So what I make mistakes,does that prove you are really smart?

Each of my posts has been a response to something you have said. If you knew you were wrong you shouldn't have made the ridiculous claim that you couldn't think of anything and then to compound that by saying "sync issue" wasn't a good subject line because your problem wasn't about sync issues!

I never said anything about being smarter than anyone. I make lots of mistakes. When someone calls my attention to a mistake I either admit I was wrong or just drop it. I don't try to make them out to be the bad guy. If you reply to something I say with some nonsense you bet I'm going to call you on it.

[macleod]

I am confused as to why you are demuxing? If you captured at 640x480 (please answer if you did the registry hack or if the files that you recorded are in different chuncks - powervcrII will break up files over 650 meg).

I guess where I am getting is did YOU merge all of those files when you did your capture? Either you did the hack OR the file is broken up over X files OR it was under the 650 limit. When I read that the first 5 or so minutes is fine and then stuff happens, it tells me that you have chunks of the video and that they were merged together. Please reply.

[Gazorgan]

PowerVCR creeps on me also. In fact most of my capture to MPEG programs creep on me (and causes my sytem clock to slow down so timers are worthless). I do capture a lot of animated material, which isn't as critical on sync.

I have zero issues capping to AVI in about any codec I care to use.

[FOO]

You have a creepy system

[lgh529]

Why don't you open the file using Virtual Dub Mod, then frameserve to your encoder. That way, you don't have to save the AVI taking all the disk space?

[darknavi]

I did the registry hack so I can save files over 650MB,the joining part didn't work too well,since there is maybe a 500ms delay when joining it causing the sync to be even way off.

Why don't you open the file using Virtual Dub Mod, then frameserve to your encoder. That way, you don't have to save the AVI taking all the disk space?

How can I frameserve with vdubmod? Or what does it mean?


And presto...forget it...so what I make mistakes? Doesn't prove you are better than me anyway. I WANT to use this topic,I choose this name,so what? I ain't allowed to use this topic? At that time,this is all I could think of,I can't wait one whole day just to think of a topic,besides,its like 1am when I started this topic,I just posted and went to sleep. I didn't bother about thinking of a better name. Besides...I ain't the only one making mistakes here :P

[darknavi]

I think I found the problem. My original MPEG2 has 55949 frames but my encoded version(avi) only has 55948 frames. Which is 1 frame missing like all my other encodes. The audio is 34ms longer because of that 1 frame missing. I guess that causes the audio sync. How can I remove the 34ms from the audio? Can I do it in goldwave?

I need something that can remove up to 1ms of audio not like some programs which show u the whole audio "bar" thing,that is too big,even if I zoom in,it wouldn't be accurate.