Convert to VCD problem ...

[Liru]

Hi all,

I have an XviD avi file which has 25.117 FPS. When i try to covert it to VCD (PAL) the sound gets out of sync

Is there any method to solve this problem?

Thnx.

[Liru]

I take that this problem has no solution????

[teegee420]

You should always decompress the avi audio to wav before converting to mpeg. Especially if you are using TMPGEnc.

[VCDHunter]

Do as teegee420 suggests. TMPGenc struggles with VBR audio, so use Goldwave to extract the audio to wav. Load TMPGenc as normal but use your newly created wav file as the audio source. You may also check the avi for bad frames in Vdub and cut out the errors before you do anything else.

[Liru]

I encoded it with Mainconcept and the 25 FPS mpeg created has a duration of 1:29:03 hours, while the extracted wav has 1:28:38 hours.

I extracted the wav using CoolEdit Pro's "extract audio from video" option, which was accurate if we take into consideration that the original 25.117 FPS file has the same duration.

What do i do now?

Cheers

[VCDHunter]

I encoded it with Mainconcept and the 25 FPS mpeg created has a duration of 1:29:03 hours, while the extracted wav has 1:28:38 hours.

I extracted the wav using CoolEdit Pro's "extract audio from video" option, which was accurate if we take into consideration that the original 25.117 FPS file has the same duration.

What do i do now?

Cheers

Stretch the wav so its the same length as the finished mpg then multiplex them together.

[Liru]

Just tried this with CoolEdit PRO, using 2 stretching methods, but still no joy ...

It still gets out of sync, just from the beggining of the file. Is there a particular way i should do this?

Thank you.

[VCDHunter]

Just tried this with CoolEdit PRO, using 2 stretching methods, but still no joy ...

It still gets out of sync, just from the beggining of the file. Is there a particular way i should do this?

Thank you.

Is the file OK to begin with ? Have you checked for and removed any bad frames ? Is the audio in sync in the original file ?

[Liru]

Yep, the file is OK, the sound is in perfectly sync, but as i said before, it's not true 25 FPS, but 25.117

I didn't check for bad frames, though. What's the best method to do that?

Cheers

[Hardcoreruss]

Use virtualdub, a guide can be found on the left.

[Liru]

I used Virtualdub v1.5.6, video -> Scan video stream for errors and the result was "0 frames masked (0 frames bad, 0 frames good but undecodable)"

Is this ok?

[Liru]

Any other suggestions? I'm stucked.

[VCDHunter]

Any other suggestions? I'm stucked.

Try cutting off the start of the wav first second or summat ?

[nexus123]

I have the very same problem myself and have uhhh invented a solution... I take and split the file into many pieces usually six. Before converting. If the the audios not in some weird format I usually don't extract the audio at all any more. I then encode to vcd compliant mpeg with tmpeg (I prefer mainconcept much much faster for me) then I Burn them to a cd. By splitting it is seems to isolate the audio synch problem to the area where it starts at i.e. if it starts in the middle of the second section it ends with the same section. It sometimes but not always starts immdiately afterning encountering screwed up frames but sometimes its just gradual and it seems to clear that up as well. I hope this helps

[Liru]

Thank you for your suggestions.

[ujjwal]

Even I do something simillar (while creating DivX to SVCD).
I use aviutil to separate out Audio(wav) from the .avi file. (I have found aviutil better than VirtualDub at this).
Load the file in Virtual Dub, carefully monitor at what parts the audio is getting out of sync. Cut the AVI at that place.
Merge the Video and Audio using VirtualDub.
Now merge the remaining audio and Video checking the sync problem and correcting it with VirtualDUb's Audio skew correction in Audio -> 'Interleaving' Option.
Again check the AVI for out of sync problems. Cut it at the place where it is going out of sync.
(This process may give out very few cuts if the out of sync problem is at 1-2 places, Otherwise may take a long time.....)
Hope this Helps.........