MPEG2 is fine but problems after creating/burning DVD

[Dom S]

Hi

I have just upgraded to a powerful new PC running XP and have reinstalled all software and my DVD writer drive. I converted an AVI movie after separating out the WAV and encoded using TMPGEnc (amazingly fast with the new PC). The resulting MPEG2 file plays perfectly in Windows Media Player. I used ULEAD Movie Factory demo to create and burn the DVD.

The resulting VOB file and DVD has a number of problems - audio is out of sync by several seconds at the start of the disc when playing back on the PC DVD drive. On the standalone player its even worse with the video advancing only a few frames a second.

Any suggestions on how to fix this please?

Thanks!

[KingJohn]

Did you scan the AVI for junk frames before you started ?

Often playback may look fine, with Media players skipping bad frames.

[Dom S]

Hi

No errors when scanning in VirtualDub but I think you may be on to something.

I opened the original AVI in VirtualDub again and it give a message "VirtualDub has detected an improper VBR audio encoding in the source AVI file and will rewrite the audio header with standard CBR values during processing for better compatibility. This may introduce up to 10401 ms of skew from the video stream. If this is unacceptable decompress the entire audio stream to an uncompressed WAV and recompress with a constant bitrate encoder..."

Now what I actually did was save to WAV uncompressed and then used TMPGEnc to create the MPEG2 using the original AVI as video and the WAV as audio input. Did I miss a step - not sure what the recompressing of audio means?

Thanks again

[KingJohn]

That’s the trouble, people do bypass Vdub and can miss problems like this. The movie is using a Variable bitrate, TMPGEnc can convert those, but on some PC's it’s a bit much too handle all at once so you need to save out the audio uncompressed. If there had been junk frames as well, then more work in Vdub would be needed using the uncompressed WAV as the audio source.

Re-compress
Vdub is telling you to decompress the audio to a PCM uncompressed WAV, then re-compress it using Constant bitrate (CBR) which would then be added back to the AVI.

But since your not interested in keeping it as an AVI, you don’t need to re-compress, just use it with TMPGEnc. However its warning you, as any work on the AVI may give lip sync.

Vdub re-compress.(Not needed if using TMPGEnc to convert to VCD)

Keeping it as an AVI, with CBR

Audio > Full processing mode
Audio > Compression > (None uncompressed PCM)
Audio > Conversion > 44.1Khz
SAVE WAV
Wave is now saved uncompressed
-----------------------------------

Audio > WAV Audio > The WAV you saved
Audio > Compression > Codec > MP3 > Bitrate (To keep it small, if necessary)

Video > Direct stream copy

SAVE AVI

Adds MP3 to the already compressed Video

If you re-load that into Vdub, there will no longer be a warning.

[Dom S]

Thanks for that explanation. I am a little confused now - do I need to do the steps you describe again to improve the AVI using VirtualDub before using TMPGEnc in order to solve the problem I am having with the DVD VOB files?

[hellmett]

IT is ULead!

Had the same issue!

UPDATE the DVD Movie Factory with the patch and all will be fine!

Look on ULead's site for further info!

Later!

hellmett

[Dom S]

ok great thanks will that work on demo or only when i buy it ?

[offline]

As your MPEG2 file plays perfectly in Windows Media Player
I'd say hellmett is spot on. The patch worked for my DEMO copy.


Get it from

http://www.ulead.com/tech/dws/dws_ftp.htm

[Dom S]

Great! That seems to have done the trick on the VOB using a quick sample of the MPEG2 - thanks very much. Before I burn it , I now have two driver choices in ULEAD for my DVR 104. The new one is an NTI one - do either of you know whether it makes any difference which one I use?

Thanks

[KingJohn]

Thanks for that explanation. I am a little confused now - do I need to do the steps you describe again to improve the AVI using VirtualDub before using TMPGEnc in order to solve the problem I am having with the DVD VOB files?

Hi, well I gave the explanation for the future, you should always check AVI's in Vdub, it does save wasting time when TMPGEnc stops half way, or makes the output bad. Playback will always skip through bad frames, but conversion wont..

[Dom S]

Thanks - it was much appreciated.