problem with dvd files

[spizz101]

Hi people. I have another problem with video files again. After using virtual dub to uncompress a compressed avi file i fed it into DivX to DVD and the dvd video files have been produced out of sync. The sound comes before the picture. Any suggestions as to what might have happened this time and how to correct it?

thanks, any help is appreciated as always

spizz

[fritzi93]

Hey Spizz,

Is the audio out of sync a constant amount or does it go out progressively? If it gets further and further out of sync, trust me, it's gunna be a lot of trouble to fix. If, on the other hand, it's constant, it may or may not be a difficult problem.

Let me guess, you did this:

File -> Open Video File
Video -> Direct Stream Copy
Audio -> Full Processing Mode -> Compression -> No Compression
File -> Save AVI

And when you fed it to DivXtoDVD the result was out of sync? Did you first test the new AVI for sync?

I'll assume you're using VirtualDub MPEG2 version. If the saved (new) AVI is constantly out of sync, load it again and do this:

Audio -> Interleaving -> Audio Skew Correction. It's in milliseconds, try (+) 1000 to delay the audio one second, (-)1000 to play it earlier.

Then File -> Preview output. Adjust as necessary until you think it's correct, and save out another file.

If, OTOH, the audio was in sync in the file you fed to DivXtoDVD, it's more difficult. Try just saving out the audio and compare the timestamp to that of the AVI. If they are not the same, you need to slow down or speed up the audio. An audio editor like Goldwave is best for that. Audacity can do it too and is free, but more difficult to use.

It may come down to a corrupt file and bad frames. If nothing else seems to work, you'll have to scan for bad frames and manually delete them. It's at this point I'd say that it's definitely not worth the trouble.

Good luck.

[spizz101]

hi the uncompressed avi file plays fine and completely in sync but the dvd files produced through divx to dvd are not in sync like i said but they are out of sync at a constant rate by about 1 second all the way through. thanks

spizz

[spizz101]

and yes sorry i forgot to mention i am using the mpeg2 version of virtual dub!

thanks

spizz

[fritzi93]

Hey Spizz,

Try loading the AVI in VDub and start at the first frame and step one frame at a time for a dozen or so frames. Is there a frame near the beginning that says something like "B Frame Decoder Lag"? That would certainly screw up the sync. Even if you don't see that, how about trying this: Load it, and have VDub jump to the first (or next) keyframe. Hit mark in, go to the end of the file, and hit mark out. Save it, and try that in DivXtoDVD.

If that doesn't work, you'll have to demux, reset the audio delay in an audio editor, then reauthor the DVD. It CAN be done with freeware: PgcDeMux to demultiplex, BeSweet using the frontend BeSweet GUI v.0.7b4 for the audio, and Rejig to do basic (no menu) authoring. It'll take some patience on your part, is this file worth the effort?

Good luck.

[spizz101]

hey fritzi thanks for ur patience it is much appreciated!

I found the log files for the conversion and there were a lot of errors in frames so i have pasted some of the log below. When i say some i mean that there were alot more video packs dropped due to errors in frames! This is about halve the errors but i hope it will help u help me!

03/02/2007 21:00:24 warning video packet dropped due to error on frame 83854
03/02/2007 21:00:24 warning video packet dropped due to error on frame 83852
03/02/2007 21:00:23 warning video packet dropped due to error on frame 83850
03/02/2007 20:44:18 warning video packet dropped due to error on frame 58727
03/02/2007 20:44:18 warning video packet dropped due to error on frame 58725
03/02/2007 20:44:18 warning video packet dropped due to error on frame 58723
03/02/2007 20:44:18 warning video packet dropped due to error on frame 58721
03/02/2007 20:44:17 warning video packet dropped due to error on frame 58719
03/02/2007 20:44:17 warning video packet dropped due to error on frame 58717
03/02/2007 20:43:57 warning video packet dropped due to error on frame 58071
03/02/2007 20:43:55 warning video packet dropped due to error on frame 58069
03/02/2007 20:07:24 warning video packet dropped due to error on frame 1033
03/02/2007 20:07:24 warning video packet dropped due to error on frame 1031
03/02/2007 20:07:24 warning video packet dropped due to error on frame 1029
03/02/2007 20:07:24 warning video packet dropped due to error on frame 1027
03/02/2007 20:07:05 warning video packet dropped due to error on frame 530
03/02/2007 20:07:04 warning video packet dropped due to error on frame 528
03/02/2007 20:07:04 warning video packet dropped due to error on frame 526
03/02/2007 20:07:04 warning video packet dropped due to error on frame 524
03/02/2007 20:07:04 warning video packet dropped due to error on frame 522
03/02/2007 20:06:45 warning video packet dropped due to error on frame 12
03/02/2007 20:06:45 warning video packet dropped due to error on frame 10
03/02/2007 20:06:45 warning video packet dropped due to error on frame 8
03/02/2007 20:06:45 warning video packet dropped due to error on frame 6
03/02/2007 20:06:45 warning video packet dropped due to error on frame 4
03/02/2007 20:06:45 warning video packet dropped due to error on frame 2
03/02/2007 20:06:45 info MSG Level #0 - rc buffer underflow

03/02/2007 20:06:45 info Output Stream#1 - Audio: ac3, 48000 Hz, stereo, 192 kb/s
03/02/2007 20:06:45 info Output Stream#0 - Video: mpeg2video, 720x576, 25.00 fps, q=2-31, 7529 kb/s
03/02/2007 20:06:45 info MSG Level #1 - Warning min_rate > 0 but min_rate != max_rate isnt recommanded!

03/02/2007 20:06:45 info Stream #0.1 --> #0.1
03/02/2007 20:06:45 info Stream #0.0 --> #0.0
03/02/2007 20:06:45 info Stream mapping
03/02/2007 20:06:45 info Set Avg. video bitrate 7529.9 kb/s
03/02/2007 20:06:45 info Segment #1 - borat 2.avi
03/02/2007 20:06:45 info 1 file(s) to convert - Total Time 01:20:20
03/02/2007 20:06:44 info PAL 25 FPS output format has been selected
03/02/2007 20:06:44 info 16:9 automatically selected
03/02/2007 20:06:44 info conversion started
03/02/2007 20:06:42 info Delay of audio #0 = 460 mS
03/02/2007 20:06:42 info Computed Frame Aspect Ratio : 1.8571
03/02/2007 20:06:42 info Stream#1 - Audio: pcm_s16le, 48000 Hz, stereo, 1536 kb/s
03/02/2007 20:06:42 info Stream#0 - Video: mpeg4, 624x336, 25.00 fps
03/02/2007 20:06:42 info Found 2 Stream(s) - movie duration 01:20:20.000

03/02/2007 20:06:30 info User default language : 2057 (0x0809h) - English (United Kingdom)
03/02/2007 20:06:30 info System default language : 1033 (0x0409h) - English (United States)
03/02/2007 20:06:30 info Version 0.5.2.99
03/02/2007 20:06:30 info ExeName : "C:\Program Files\vso\DivxToDVD\DivxToDVD.exe"
03/02/2007 20:06:30 info OS : Microsoft Windows XP Personal Service Pack 2 (Build 2600)

thanks for anymore help and for any more of your time

[fritzi93]

Eh, let's back up to the beginning. How about loading the original AVI in GSpot to find out the particulars of the audio. Free, here:

http://www.headbands.com/gspot

Is the audio by any chance AC3?

[spizz101]

thanks for all your time and support fritzi but i have decided to not bother with the file any more as it is now freezing and messing up.

Thanks for your patience, its much appreciated

spizz

[fritzi93]

Good call. But in case you want to have another go, you can do full processing on the original video and "scan video stream for errors". Once it's through scanning, save to a new file, it will replace each bad frame with the last good frame. But you either need space for a huge uncompressed AVI, or you have to recompress (quality hit), or frameserve directly to an MPEG encoder.

That in itself may fix the problem, but I doubt it. If the original audio is VBR MP3 you may never be able to fix it. If you're lucky, the original audio is AC3, in which case you save it out directly, reset the audio delay, remux and reencode. Otherwise, demux the VOBs from DivXtoDVD, edit the audio, and reauthor. But again, you may never be able to fix a corrupted AVI. DivXtoDVD is much more tolerant than most encoders, but some files just ain't gunna work.

Good luck. If you're interested there's a bunch of guides at videohelp on nearly every video-related subject.

[spizz101]

I dnt no how to do any of that but thanks again as always! I can always count on u to help me with video and audio problems thanks again fritzi!

spizz