audio sync with VirtualDub as frame server

[bri2366]

ok! here it is!
had problems with jerky motion using TMPGEnc to encode from 23.976 to 25.000 fps! heard that TMPGEnc was crap for doing frame conversion!
Used VirtualDub as a frame server! the video is now smooth as a babies bottom, but is out of sync with the audio!
VirtualDub also reports the avi as having a vbr audio!
any help would be much appretiated!

who said this dvd creation stuff was easy by the way! I've no hair left now!

[0 kewl]

VBR audio problem is sorted out by extracting it as WAV with Virtual Dub like so:

Audio->Full compression mode
Audio->Compression->no compression
Audio->Conversion->tick 44100Hz (for VCD), press OK
File->Save WAV
Load this WAV as audio and original AVI as video in TMPGEnc.

For the out of synch problem you need to upsamle your audio to match the legth of your video (if it's framerate was changed 23.976->25 fps) using progs like CoolEdit, BeSweet, SoundForge or GoldWave.

[bri2366]

ok! did that!
this might sound like a newbie question! how do I resample the audio with cool edit?

[0 kewl]

Load your converted AVI (25 fps) into Virtual Dub
File->File Information
In Video stream box look at # of frames (time) and write the number of frames down somewhere
Close VD
Open CoolEdit
File->Open (load your WAV)
Transform->Time/Pitch->Stretch...
Take the No. of frames you wrote down, multiply by 23.976 and divide by 25 and input the resulting time in seconds in the Length box (under Constant Stretch tab), tick High Precision, press OK. After done save as Windows PCM (WAV).

[DJRumpy]

Or, just use BeSweet GUI, load your audio file and pick NTSC to PAL 8)

[bri2366]

the problem here is! I'm encoding from an xvid 23.976 fps avi file to mpeg2 25fps using TMPGEnc, and using virtual dub as a frame server for the frame conversion as I have been getting jerky motion using TMPGEnc for frame conversion, this is were the audio sync problem was occuring! I can convert the avi file with no audio to a very crisp clear and smooth mpeg2 dvd complient file!
the question is, can I do the same calculation for the uncompressed audio file I created from the original xvid avi file, and then merge the audio file back into the mpeg2 file without having to re-encode!

video.mpeg( can I do the audio calculation with this file
audio.wav(uncompressed)

does two go into one?

[0 kewl]

The audio has to be in MP2 format to merge it with Mpeg2. You can use BeSweet to convert it to MP2 and then multiplex with TMPGEnc (that's if your WAV now is 25 fps just like your Mpeg2). Or, you could use AviFrate to change the framerate of your initial AVI file to 25 fps and then load it as video source and your WAV (if already resampled to 25 fps) as audio source in TMPGEnc and encode to Mpeg 2.

[bri2366]

ok guys
looks like all your patience with me has paid off! cheers
thanks for all your help! was much appreciated!

ermm! one other thing! is TMPGEnc the best multiplexer to use, it doesnt seem to support constant bit rate multplexing?

just ran into another little problem here!
now trying to do the same thing with a divx 5.0.1 avi, but get and error in TMPGEnc when trying to load the dummy avi that I created in virtualdub!
"can not open or unsupported" any ideas on this one?