AVI once converted has sync issues. Please Help!

[Marts1988]

Ok im new to this software and know the basics on how to use it and convert etc.

The issues i am having are that when converting my files which are AVI. format, i put them into SVCD2DVD which converts this into an Audio and Video format ready to burn to disc.

Basically once burned to a disc and played the audio is out of sync on every device i run it on. Now i have had this issue with every PC used in my home and also with every AVI. file i have downloaded.

I am just wondering if there is anything i can do before converting or after converting which will align the audio and video so they are not out of sync.

Basically video is ahead of the audio constantly by the looks of things. Any help would be greatly appreciated as i have never been able to correct this since owning SVCD2DVD. Thanks

Forgot to add that when AVI is played in Media Player etc it plays fine with no sync problems. Its only once it is converted and gives you the Audio and Video files and also the other video file MPEG4 or what ever it produces, cant check as at work haha, but it then goes out of sync when either formats are burned to disc or watched on PC.

So basically when AVI is played before converted it runs fine with no issues but once converted in SVCD2DVD the MPEG4 is out of sync and also when the Audio and Video folders are burnt to disc and played that is out of sync also.

[orsetto]

Same thing happens with my own file conversions to DVD format: AVI, DiVX, MP4, FLV or WMV converted to VIDEO_TS dvd format with either DVDflick or AVS2DVD results in wrecked audio sync. I've been too lazy to pursue answers, because most of the files I converted were foreign-language so the lip sync loss was less annoying than usual. The audio mismatch initially seemed worse when converting PAL files to NTSC dvd format, but the problem remains significant even if I make a PAL-to-PAL or NTSC-to-NTSC conversion. Would be great if someone had a simple fix for this...

Some may say "why not just play the files directly?". The answer is, many AVIs and other video downloads don't play well directly (stuttering, freezing, no image shows in player window) but for some odd reason they'll play fine once converted to DVD format. Except, the audio sync gets lost. Damned if you convert, damned if you don't.

[hech54]

This "problem" is as old as Divx/Xvid.....some people cannot get a good sync to save their lives....others like me have no problems. I don't convert from Xvid to DVD very often....but when I have problems with "one click" softwares like the above mentioned I just load it up in AviDemux and fix the audio skew in there....or even VirtualDub then frameserve it over to TMPGEnc Plus. It's not brain surgery. If one "one click" software has trouble with a file I don't try another...I do it the right way.

[redwudz]

The first thing I would check for is VBR MP3 audio. It can cause audio sync problems with some programs. And it's commonly used on DL'd video. MediaInfo or Gspot can tell you if that's what you have. You can try running the audio through something like Audacity and changing it to CBR and see if that cures it before your DVD/MPEG conversion.

Second thing is what kind of sync problem? Does the audio have the same sync error throughout the playback? If so, it's an audio offset problem and you would need to determine the offset and add a correction. Play it in something like MPC, then adjust the offset and note it. Then apply that to the converted video. The other type of sync error is when the audio and video lengths differ. That would cause a sync error that gradually gets worse as the video plays. You can change the audio length in a program like Audacity.

PAL><NTSC can also cause problems, depending on the method and programs used for the conversions. I generally use ConvertXToDVD and it seems to handle PAL><NTSC and VBR MP3 audio without sync problems most times.

Worse is a combination of all the above, usually caused by a damaged file. Most software players can handle a slightly damaged video file. But re-encoding needs a perfect file or you will get problems like you describe.

If most of the files are Xvid/Divx, easiest is to just get a set top player that can handle the formats and don't convert.

[Marts1988]

This is the point, why pay the money for SVCD2DVD if when you convert it, its unwatchable when done, the whole point in that programme is to convert the file you download into the necessary format so it can be burned onto disc and watched through DVD players etc with no issues but all it seems to of done for me is cause issues with syncing problems.

I dont want to have to download and install more programes etc i just want the programme to work the way it should instead of taking long way round which seems pointless as this is why it was purchased. What i dont understand is my friend uses SVCD2DVD and his works fine no sync problems at all. I have tried uninstalling and reinstalling with no avail just dont understand at all.

[Marts1988]

Basically no matter where i source the AVI files from when ever i put it through SVCD2DVD it makes that download out of sync constantly throughout the film. The audio is behind by about 1 second constant.

Therefore i dont see how i can modify an AVI file that is already working and when converted on my friends system is fine, wouldnt this mean the AVI is fine and something is wrong with the software i am using. (Also use the same burning software and operating system as my friend)

This is why i am asking as like i said it does not matter where i source my downloads from they always turn out the same.

[filmboss80]

Please re-read the first paragraph of the post by redwudz. Your problem might be due to VBR (variable bitrate) audio. If you are going to keep the file as an MPEG-4 based .avi, I would suggest VirtualDubMod, changing only the audio part to CBR (constant bitrate) mp3 and going with Direct Stream Copy for the video part, saving to a new .avi.

[hech54]

Basically no matter where i source the AVI files from when ever i put it through SVCD2DVD it makes that download out of sync constantly throughout the film. The audio is behind by about 1 second constant.

Then go buy the DVD.