Audio/Video out of whack when converted.

[Raulie]

*pulls out hair*

Ok, I have this avi. Im trying to convert it to KVCD in TMPGEnc (I even tried to convert it to regular mpg). For some reason, on my computer (my old one had no problem with this but seeing as this is a new one) when I put any file into TMPGEnc, it will not encode the audio with the file. So what I do is strip the .wav with virtual dub and convert it with the video file in TMPGEnc. Usually everything comes out fine, but with this one file, the output file is not in synch, at any part of the video. Someone told me that possibly the framerate was wrong, but it's 23.976 fps. I don't know what to do anymore, I was going to try and acquire this file for the second time, but have been unsuccessful in relocating it. If anyone has any hints/solutions/etc it would be much appreciated.

Thank you.

[tito13kfm]

have you scanned for bad frames yet? What codec is used for the video, what for the video, is the audio CBR or VBR..

Open it up in virtualdubmod and see what it says.

My TMPGEnc started doing this to me on EVERY mpg file, but it did it by exactly .96 seconds so I would open the audio, insert a silence and encode because I didn't feel like reformatting at the moment.

Is the audio uniformely off (same amount of time at beginning and end?) then try encoding a few frames from the beginnign and end (start at frame 10 and end at frame -10, that worked for me half the time)

does the audio get progressively worse? (probably wrong frame rate, or ALOT of bad frames).. make sure the frame rate is exactly what you want it to be.

What are you using to encode the audio with? Try out ffmpeggui02c to convert it to an ac3, that works good for me.

that's all i can think of right now, it should give you some stuff to work with.

[MrMungus]

have you scanned for bad frames yet? What codec is used for the video, what for the video, is the audio CBR or VBR..

Open it up in virtualdubmod and see what it says.

I've created some "bad" MPEG-2 files lately. Where in VDub does it tell you about bad frames?

[Raulie]

does the audio get progressively worse? (probably wrong frame rate, or ALOT of bad frames).. make sure the frame rate is exactly what you want it to be

How would I go about doing that?

The codecs used for all the videos are Xvid and the audio is mp3 if im not mistaken bitrate: 127 kb/s (63/ch, stereo) VBR, Fs: 48000 Hz.


If there were alot of bad frames in the avi, would there still be any way I could fix it? The avi synchs perfectly, it's just the conversion output that doesnt, no matter what I convert it to.

Thanks again.

[SteveLF]

I've had this type of problem as well with some variable rate audio files,(although I use Canopus Procoder).

This is now my standard conversion routine:-

Load the AVI into virtual dub

Under Audio, select full processing mode and SET THE COMPRESSION TO NONE (PCM) (Note: you HAVE to click on it).

Save the WAV to disk from the file menu (this will create a huge WAV file).

Now Select NO AUDIO.

Set the video to direct stream copy

Save the AVI (should save with no Sound).

Close Virtual Dub
Restart Virtual Dub
(*)
Load the AVI
Click on WAV Audio
Set to Full processing mode
Select an ADCPM codec (click on the 44000 option)
Set video to direct stream copy
Save your new AVI

This should give you a recombined (and hopefully in sync AVI).

Note, after you have recombined, play the AVI, if the sound sync is out, go back to the (*) and adjust the audio position on the Interleaving menu.

---

When mpeg encoding a file with the audio re-packed as above I have never had any problems.

BTW, if the file contains AC3 sound, I use headache to unac3 it then I recombine as above.

Hope this helps!

[Raulie]

Thanks tito13kfm and SteveLF, both of your guys tips/hints worked on two different files I had! I appreciate your help.