Pb with sound when encoding for SVCD

[Carole/Nanef]

Hi everyone,

hope someone can help me...

I'am trying ton create a SVCD file with FFMPEGX and all is working except the sound : the sound jump and it's out of synchro.

I'am using the quick preset : SVCD.
The source file is a .mov exported from iMovie (Quicktime DV format).

I use the latest version of FFMPEGX and MacOS X Panther on a G4.

Any advice will be welcome.
Merci à tous.
Carole/Nanef

[Luís Sequeira]

The only help I can give is to look on the other threads. One person there suggested not to change from PAL to NTSC (or vice-versa) and don't change the frame size or frame rate.

I was a little skeptical (living in Portugal, I assumed that I had to use PAL as the VCR unit I got was bought here) but the truth is that the VCR unit worked wonderfully with a NTSC SVCD (I had DivXe encodings for NTSC's frame size).

This was the only way I could get the sound in sync when converting from AVI/MOV/MPEG-4 to SVCD...

Also good is to mantain the bitrate and sampling for the audio channels. In fact, the fewer differences between the input and the output, the higher success rate for correct audio sync at the end At least that's my experience.

[wibbler]

In the full mjpegtools archive there is a utility called yuvfps, which is missing from the ffmpegX directories. From what I can gather from the MJPEG web pages, yuvfps is inserted in the command pipe along with yuvscaler and alows you to change the video rate from NTSC->PAL and vise versa... it stutters/repeats frames going one way and removes frames going the other...

W.I.Bler

[firedrill]

Hi,
in my short experience with ffmpegx, there's no way to sync audio, for me.
I've tried to encode with every combination, really every setting available(i think) but the best I've achieved is to have audio a little "before-of-sync" at beginning sequences, in sync in the middle of movie and a little "after-of-sync" in the last sequences.
Keeping sizes and rates similar to sources does not help, at least for me.
The longer the movie the more is out of sync, so I conclude the only one way for me is to keep movies...short !
Splitting a 70-90 minutes to more parts (2 or 3 or more) should keep the "out of sync" issues almost camouflaged and acceptable but not resolved.
Sometimes with software players as VLC I do can correct this with an option, but not with regular stand-alone discs players is this possible.
Don't know if it is my fault or a buggy behaviour.
Someone knows the matter?
FRANCO -(italy)

[major]

Please post or email me to major4@mac.com a sample encoding experience (formats, settings, process output) so as I can help you.