25fps .avi to SVCD w/ TMPG

[sdsumike619]

Hello, I am having syncing trouble trying to make an SVCD via Virtual Dub and TMPG and I'm thinking it has something to do with the fact that the video is 25fps instead of 23.976 or 29.97 - I've made plenty of other SVCDs just fine and they had the standard frame rates. After encoding the mpg in TMPG, the audio and video are not in sync. Is there a way to convert the .avi to a standard frame rate, and if so, will this fix the problem?

Mike

[sterno]

25fps is PAL standard. Check the guides list, there are a few that cover converting between PAL and NTSC.

[sdsumike619]

I looked in the guides section, didn't see a one thing about converting to NTSC from PAL. The avi plays fine on my computer, it's after it's encoded to mpg is where the sync is lost. I did the normal steps using Virtual dub to save an uncompressed wav file and using that as the source audio in TMPG... but comes out out of sync...any suggestions or fixes?

mike

[ZippyP.]

It's best to keep the same frame rate for your mpeg as your source frame rate. Many North American DVD players will still play PAL videos, use the PAL template and try the disk in your machine.

In order to sync a PAL to NTSC conversion you need to change the duration of the audio to match the video. Goldwave can do that using the "Time Warp" function before you do your conversion.

Here's a list of guides for framerate conversion.

[andyp1]

I agree with zippyp
I used to convert the other way from NTSC to PAL and I got a juddering effect , it didn't ruin the videos but the effect was apparent.
I now make the output the same as the source and found it plays in all players perfectly .

[sdsumike619]

so, let me see if I have it straight,,, If I simply convert the .avi in Virtual Dub to an NTSC rate (23.976 or 29.97), and then go about making the mpgs in TMPG, the audio will still be out of sync? (assuming that I render an uncompressed wav and use that as the audio) ??

[johns0]

You can direct stream save the avi to 23.976 fps and then use besweet to change the audio framerate from 25fps to 23.976fps in wav and then get virtual dub and load the new avi and insert the new wav and direct stream save and then encode as you want.

[sdsumike619]

What is besweet? I have Soundforge, will that work?

mike

[johns0]

It will work,you will just have to calculate the time difference with the new frame rate and adjust it accordingly,i find it easier to use the besweet with gui approach,just click on the besweet link and check it out.

[sdsumike619]

hmm, it seemed simple enough , yet it didn't work at all,, i used besweet,,,,i must have done something wrong? followed ur directions,,, way out of sync

[johns0]

If the avi has no stream errors and the audio is good then it should sync with no problems,ive done this with a few avi and found some will go out of sync due to errors in the stream,also make sure that besweet changes the length of the audio,compare the 2 files and there should be a 3-4 minute difference if the movie is about 90-100 minutes long.

[mikeny]

I would think that you could also:

1.encode the .avi video only in TmpgEnc to 23.976 (check Enc 3:2 Playback setting)

2.Convert the .wav from goldwave or virtualdub to .mp2 with Besweet [check setting for 25fps-23.976 & make sure ssrc setting is set to your target frequency (44100 or 48khz for dvd-svcd)

3. Remux the encoded video with the new mp2.

[johns0]

That will not work.

[sdsumike619]

maybe it had to do with the fact that I kept it at 44100 instead of changing to 48000?- I don't recall seeing that option, I'll try it again,, that besweet was confusing to setup..I also noticed that the b4 and after wav files were indentical in size, so there was no time difference so I guess I DID do something wrong, stay tuned, i'll play around some more with it

[mikeny]

johns0,

Your way sounds convenient.

I was just wondering how is my suggestion (besides dealing with .avi video to start) much different than starting with an mpeg-2 as in https://www.videohelp.com/guides.php?link=327

One thing I left out is the dvd2avi project saving step. Can this be done with the avi source video?

That guide worked for me going from Pal svcd- Ntsc svcd and after patching with dvdpatcher I got it on a dvd with ulead movie factory, in synch.

Is starting with an avi much different?