I have 13 .avi files from an old movie that I'd like to join, but the sound is always way out of sync when finished.
I've tried Blaze Media Pro with various framerate settings, as well as VirtualDub. The .avi files are identical formats, all ripped with ImTOO DVD Ripper. Each .avi file is perfectly in sync, so it's not a problem with starting out with bad files.
What am I doing wrong? I followed the VirtualDub guide that's posted here at AfterDawn.
Problems can arise if the audio and video streams aren't the same length and/or if the joining app does take into account delays.
For instance the first part could be:
VVVVVVVVVVVVVVVVVVVVV
AAAAAAAAAAAAAAAAAAAAAAAAAA
The file will play fine by itself, but the audio stream is actually longer than the video so when you join, the audio for the second part starts 5 A's too late.
Try AVISynth with ++ to join, so
part1 = avisource("001.avi")
part2 = avisource("002.avi")
part1++part2
See if that plays in sync. If so then you could save out the audio, then mux with your original video.
Otherwise, encode each AVI into mpeg THEN multiplex the two parts.
Sinche when you encode AVI -> MPG video and audio must match (and the movie's length is decided by the video).
The MPG length will be the Video's length
That is:
1) in the
VVVVVVVVVVVVVVVVVVVVV
AAAAAAAAAAAAAAAAAAAAAAAAAA
example, the MPG will be:
VVVVVVVVVVVVVVVVVVVVV
AAAAAAAAAAAAAAAAAAAAA
MMMMMMMMMMMMMMMMM
with five 'A's which have been 'cut off'.
2) in the
VVVVVVVVVVVVVVVVVVVVVVVVVVV
AAAAAAAAAAAAAAAAAAAAAA
example, the MPG will be:
VVVVVVVVVVVVVVVVVVVVVVVVVVV
AAAAAAAAAAAAAAAAAAAAAAAAAAA
MMMMMMMMMMMMMMMMMMMMMM
with the last five 'A's which will represent silence.
If you de-multiplex the audio, you can use it, when you author the DVD using elementary streams.
If you choose a simple mpeg format (e.g. MPEG-2 CBR, which is faster than MPEG-2 VBR even if it has lower video quality) you'll speed vey much the process. It's useful, since you won't use the video output but only the audio one.
After playing with the files for another several days, the final AVI file was always out of sync. So I went about it from the other end.
I tried Xilisoft's DVD Ripper Platinum and it was able to rip the dvd files into one AVI file, instead of one for each chapter like ImTOO DVD Ripper does. And it's in perfect sync.
Thanks much for all the help and suggestions. I hope I never have to try doing that again. :p
