Audio Sync Problem from MPEG 2

[baz161]

Hi,

I have a Win TV PVR USB and used it to capture some home videos. i end up with an MPEG 2 file which i want to convert to put onto a VCD. I used DVD2AVI producing the d2v file and an audio file (always comes out as an mpa file), then i use TMpeg to make the Mpeg 1 file i need for the VCD (through Nero)

however the resultant file has an audio sync problem, it starts off ok and gradually moves out of sync, about half an hour in it is way out of sync. Adjusting the audio gap doesnt help, i tried 2500 ms and that made the second half of the video line up the audio/video but the beginning was now way off, this time with the audio in front of the video.

I have converted many DVD's to VCD and not had any problems and capturing TV has worked fine too. The reason i dont capture in mpeg 1 ready for VCD is the quality is not very good at all, i found that capturing in MPEG 2 and converting gives much higher quality.

Any ideas would be greatly apreciated, thanks,

Barrie

P.S. My PC is as follows

1.2 AMD
32 mb NVidia Geforce 2 GTS
640 PC 100 Ram
60 Gb HDD
Win TV PVR USB

[Rickyblaze]

If you are trying to capture from old vhs tapes I can tell you it is a pain in the a$$ I have been having the same problem with a few of the tapes from my home videos and have come to the conclusion after reading about this problem extensively that a time base corrector may be needed to help with this problem. Do a search on time base correctors and you will see several post that talk about old vhs tapes and how they can become degraded to the point of needing some digital correction from these tbc's. I am in the process of buying a Datavideo TBC-100 pc card time base corrector and hope that this helps. I did'nt figure on spending this much to archive the family memories but I guess it's worth it.

[baz161]

Thanks for the reply, i understand what you were saying, i searched the other posts and it makes for some interesting reading.

Just one more thing that i dont understand, the MPEG 2 file i captured works great with no audio sync problem at all. but at 2.75 gig is of no use to me, why if this file is in perfect sync can i not make another file, be it VCD, SVCD, DivX that is also in sync? anything at all to get it onto a cd/cd's at decent quality.

Are there any other programs anyone would suggest a different file type etc.

thanks again
Baz

[baz161]

Hi,

just to see what happened i used DVD2AVI to on the MPEG 2 file and chose save AVI, this gave me 2 files, an AVI (Video) and a .mpa (Audio). The video file came out 5 seconds shorter than the audio file. Confirming the need for a TBC BUT is there no way to convert the already in-sync MPEG 2 file to a VCD or DivX.

Perhaps a process that doesnt involve splitting into 2 files (audio/video)?? anyone have any ideas, thanks

Baz

[rinkel]

Hi,
I don't know much about this capture card, but there is another way:
Consider making Svcd in stead of vcd. That needs mpeg2 and is of much better quality.
And if you player doesn't support it, consider buying a new desktop player.

But first you have to make sure that your mpeg file has not audio-out-of-sync problems

Rinke

[gf]

Hi rinkel
Can't you open your files directly in TMpeg and by-pass dvd2avi? Some of my videos I can open directly in TMpeg and it saves me that step.

[VideoMann]

Just a thought:

If your file is in AVI you may be able to use a program like SoundForge5 or 6 to adjust the audio, then encode to MPEG whatever. I don't believe it can adjust MPEG2 files.

I have not done it myself but I have seen it done on TV (TechTV)