delay audio after converting VHS to digital form

[obelix3]

i have converted a VHS to ditigal form containing an old match in 80's. but now it has a audio delay. i khow that using vmod i can fix this but the delay is not the same in the entire movie. in the begining there is a small delay, then it incrises then it is more then is less. how can i fix that? how can adjust the audio in order to be the same as video?could you describe me how it is done?

thanks in advance...

[sanjayk]

Vmod can fix this as you already know. Demux the audio to wave. Or convert to wave. Remux using the audio source as the converted wave and video source from the original file. What encoding tools are you using ?

[obelix3]

Demux the audio to wave? HOW CAN I DO THAT?
Remux using the audio source as the converted wave and video source from the original file? explain this to me please
i ma using vmod

[celtic_druid]

You could try AVISynth and use a series of trim and delayaudio commands to cut the file into sections, adjusting the audio delay in each.

[sanjayk]

Using VirtualDubMod, open the file. Select "Streams", select "Stream List". Now you will see the list of audio streams encoded into your file. Select "Save WAVE". After some processing the audio will be extracted and stored separately as a wav file.

Now you need an encoding s/w like TMPGEnc or MainConcept which will re-mux/re-join the video & audio components into a mpeg file. If you are not aware of what an encoder s/w is I suggest you read guides on this forum before proceding.

In the video source diaglog box load the original file. In the audio source diaglog box load the newly saved wav file. Select the desired target format - VCD/SVCD/DVD and NTSC/PAL. Press the "Start" / "Convert" button to start the encoding process. Depending upon the size of the file, the time taken to encode will matter.

After the encoding process is over, you will have one single mpeg file hopefully with correct video/audio sync. Good Luck.

[obelix3]

@sanjayk

the instrucions that you gave me did not fix the problem. the sync audi/video was wrong... any more ideas?

[sanjayk]

Well, what I suggested should have sloved your problem. It has solved for me on many ocassions.

Can you tell me what is the original audio stream type as shown by VirtualDubMod. If it is anything OTHER than wav then demux it first by selecting Demux button AND then convert the demuxed file to wav type.

Then do the remuxing as described earlier.