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Post by timj on Feb 13, 2006 1:56:02 GMT
i have a 200meg video file (vro or mpeg) of Hayley from the hour of power (oct. 05), when i encode it to convert to dvd format or .wmv, the audio and video go out of synch. i'm using Roxio easy media creator 7.5..
can anyone with video experience help me with this??
thanks, TimJ
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Post by gareth on Feb 13, 2006 23:35:03 GMT
Hi Tim, You might consider experimenting with VirtualDubMod: sourceforge.net/project/showfiles.php?group_id=65889It's a very powerful open source video editing program - very suitable to convert MPEG2 to AVI (depending on the codecs available on your computer). I have used it successfully with video formats that caused problems with other programs. If the sync problem doesn't occur with the resulting AVI file, you might even consider using just the good old Windows Movie Maker to create a WMV, if Roxio continues to cause sync problems. I can't guarantee that this works - and sometimes I set VirtualDubMod to work just before going to bed, and let the program do the conversion - it can be time consuming. Cheers, Gerrit |
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Post by alien on Feb 14, 2006 3:40:11 GMT
Hi Tim and Gerrit,
I had a similar problem few months ago and did solve the problem with VirtualDubMod as suggested. Some mpeg files require an "offset" for the audio and VDubMod does have an "audio skew correction" option. You can access it via Streams > Stream list > (right click) > Interleaving. Experiment with different audio skew correction settings.
For encoding to DVD, you can try TMPGEnc (free 30 days trial for the mpeg2 features), it's one of the best mpeg encoders out there.
Good luck!
Allen
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Post by timj on Feb 15, 2006 4:07:11 GMT
Gerrit, Allen thanks for the help. I'll try tomorrow .... TimJ
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Post by gareth on Feb 22, 2006 14:17:25 GMT
Elsewhere I have posted links to the two DVD videos Tim sent me.
They had the extension .vro, but VirtualDubMod immediately recognised them as MPEG-2 videos.
When I tried playing them, the video was played - but no audio was heard. On checking the sound stream, it turned out to be in the AC3 format - and I think that may have been the reason why audio and video got out of sync. It seems that AC3 isn't handled well by many players. VirtualDubMod could at least handle the video, but previous versions of VirtualDub refused to play it at all because of the sound stream.
My guess is that Roxio, while it could handle both streams, processed the streams at different rates, thus causing the sync problem.
Fortunately, in VirtualDubMod, there is an option to extract the sound stream completely unaltered (even though the program itself can't make head or tail out of it).
When I tried playing the resulting sound file in Windows Media Player, it told me that it didn't recognise the file extension, but that it could possibly play it. And it played the sound perfectly!
Perhaps there is conversion software to change AC3 to WAV, but by simply re-recording the sound as it was being played in 1411kbps WAV format, I did my own conversion. This also allowed me to do a little editing.
I also got VirtualDubMod to convert the video to AVI (Indeo 5.1), and finally I combined the AVI with the WAV - and no sync problems were encountered.
Tim, is it possible in Roxio to combine a video stream with an audio stream from another source? In that case, if you want to experiment a bit more, I could send you the WAVs and you could try out if that way the sync problem is solved!
Gerrit
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Post by timj on Feb 22, 2006 15:30:42 GMT
Gerrit, i found an extraction routine in Roxio easy media creator, I'll try it , too many video editors, hang my processor..................TimJ
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Post by alien on Feb 22, 2006 16:34:01 GMT
Hi Tim and Gerrit, For conversion of AC3 (DolbyDigital) format to WAV, I've been using a program called AC3Dec, you can download it at: www.ac3dec.com/One very useful tool for converting MPEG2 video with AC3 audio to AVI is DVD2Avi. I believe the author stopped development a while back but you can probably find a copy through google. The name is somewhat misleading since it doesn't exactly read from a DVD, only from mpg or vob files. It can decode the audio to wav with or without 5.1 to stereo downsampling. It actually tells you what the offset of the audio stream is so you can adjust it manually. Allen |
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Dave
Administrator
HWI Admin
Posts: 7,700
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Post by Dave on Feb 22, 2006 17:14:56 GMT
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Post by timj on Feb 23, 2006 1:11:05 GMT
a/v synch /Roxio, i extracted a wav file, muted the native audio and added the wav file as background
audio, seems clumsy but it synched right up......TimJ
(i never wanted to know this much about videos)
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Post by gareth on Feb 23, 2006 19:50:17 GMT
The way I gather it, it is probably the only way you could overcome the sync problem. However, if in the future you are in a position of capturing more Hayley video, feel free to send it to me. I love video editing - and this episode has significantly added to my knowledge about this sort of thing  . Thanks for sending those videos to me! Gerrit |
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