audio synch is weird

[brianle85]

hi everbody. i made my first vcd movie. it was a divx avi and it was big, so i cut it with virtualdub. then i converted each piece with TMPGEnc. then i burned them each with nero. the first one was fine, the second one had the sound coming around 25 seconds before the video. How do i fix this? after that, i tried a different movie, and this time both the first and second part have unsynchronized audio and video. How do i fix this?
plz help
thank you

[Scrooge]

Audio from some Divx can be a bit sus.
Most audio editors have problems with the wierd settings people put into files.
Consider doing it the right way.
Strip the audio out by loading the avi into Goldwave (demo works well and is the only software that handles low bitrate conversions properly, out of an avi)
Save the audio as a wav file (pcm), setting the bitrate to your final that you will use in your mpeg file. (usually 44100 or 48k, depending on your selection in tmpeg.) This will prevent known resampling errors in Tmpeg.
Once you have done that, encode using vid from your orig file and the Audio from your new file.
Test on your computer
If you need to cut it, use Tmpegs mpeg tools, and dont forget to select the correct stream type, as Tmpeg doesn't really do this for you, nero wont pick it up.
Burn and play. 8) 8)

[aguillon]

I second Scrooge's motion - deal with the audio separately and everything will be fine.

I have not used Goldwave, though, so I shall not comment on it.

Here's my method:

1- Use G-Spot, a lovely little utility that lets you find out what audio the file is made of. If it s MP3 CBR, that s the easiest, I proceed straight off to encoding with TMPGENC (by the way, I don t cut in Virtual Dub, I cut in TMPGEnc with MPEGTools once the encoding is complete - once I know I have a valid MPG file).

2- If the audio is MP3 CBR, I open it using the MP3 Freeze version of VDub, save the audio as an MP3 file, then convert the audio to uncompressed PCM 44hz using dBPowerAmp (freeware).

3- If the audio is AC3, I open it using the AC3 version of VDub, save the audio as an AC3 file, then convert the audio to PCM using HeadAC3he (freeware).

4- Last one: OGG audio with multiple streams (tricky). I normally use Graphedit to extract whichever audio stream I m looking for into WAV.

If I have had to go through step 2-3 or 4, I normally resize the video and add the audio in VDub, then frameserve to TMPGEnc - I get a perfect encode all the time that way. Another way is to load the AVI and the audio in TMPGEnc, then encode there. The frameserving method allows me to do more, like add subtitles for instance. Trick: doing a resize first, then applying a subtitle filter, allows to place the subtitles in the black bars below the movie, which makes them more readable.

Hope this helps.

All the softwares are available at www.divx-digest.com, www.doom9.org and www.dvd.box.sk.

Cheers