Audio sync issues

[andy99]

Hi,
I have an asf music concert clip (2 hours long) and it playes perect on my video players.
When I import the clip to either windows movie maker or NERO VISION to cut it into smaller clips, the video plays fine when I preview it but when I export the clip in either program, most of the time I get audio sync issues. Either the audio is delayed or ahead of the video and it looks like the singers are lipsyncing.
The clips will start without any sync issues and then I notice that the video starts to get ahead of the audio and thus the sync issues.
Is there away to avoid this issue?
Thanks

[Baldrick]

Try cut using asfbin.

[andy99]

Thanks Baldrick. This tool is great for cutting the asf file into smaller clips.
I can play the clips fine using WMP (no audio sync issues). But when I try to convert them to another format using NERO, SUPER or WMM, the new video produced comes out with the audio sync.
Also, if I upload the asf clips to youtube, then the audio sync issues show up as well.
Not sure what is causing this issue.
Any idea?

[Baldrick]

Can you post the details from the asf? Use Mediainfo and copy all details and paste here. VBR audio may cause this problem but it could be some other stuff also.

[andy99]

Thanks

Here you go, all the info from the original asf file that I'm trying to cut and convert

General
Complete name : C:\Sun, Sep 14 at 10_03_36 AM.asf
Format : Windows Media
File size : 1.47 GiB
Duration : 3h 58mn
Overall bit rate : 884 Kbps
Maximum Overall bit rate : 933 Kbps
Movie name : School concert
Performer : kids

Video
Format : VC-1
Codec ID : WMV3
Codec ID/Info : Windows Media Video 9
Codec ID/Hint : WMV3
Duration : 3h 58mn
Bit rate : 808 Kbps
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 4/3
Frame rate : 29.970 fps
Resolution : 24 bits

Audio
Format : WMA2
Codec ID : 161
Codec ID/Info : Windows Media Audio 2
Duration : 3h 58mn
Bit rate : 32.0 Kbps
Channel(s) : 2 channels
Sampling rate : 32.0 KHz

[Midzuki]

But when I try to convert them to another format using NERO, SUPER or WMM,
the new video produced comes out with the audio sync.
Also, if I upload the asf clips to youtube, then the audio sync issues show up as well.
Not sure what is causing this issue.

Thanks to Microsoft, which apparently designed Windows Media Audio for NOT functioning
very well outside of the ASF container. Fortunately you're dealing with a "simple"
stereo WMA, for which the "Winamp trick" should work:

https://forum.videohelp.com/topic346029.html#1814650

HTH. Good luck!

[andy99]

Thanks Midzuki. So what do I do after I extract the audio file?
Is there away to resync it to the video and convert to another format?
Again the asf file(s) play perfect on my video players but when I try to comvert them to another video format or upload them to youtube, I get the sync issues.

[Midzuki]

OK, I should have guessed you'd ask that question. My bad.

Midzuki

OUCH!

Seriously now: you'll have to convert the video separately from the audio,
then you'll have to mux the new video with the audio gotten from the Winamp~method.
I'd recommend Avidemux and VirtualDub instead of Nero and Super.
Besides, WMV can be *variable frame rate*, which
would require the use of Avisynth as well.