FFMPEG audio/video desynchronized (converting video server side)

[Lleoun]

Dear all,

I have movie.wmv that is working fine, audio and video synchronized.
And it goes though FFMPEG to become movie.swf or .flv:

ffmpeg -i movie.wmv -ab 64 -ar 22050 -b 9570 -r 29.97 -s 256x188 -y movie.swf

I obtain movie.swf (or movie.flv) and it is then when I play the swf or flv that the video starts later than the audio.

Then, I am doing:
ffmpeg -i movie.wmv -itsoffset 00:00:04 -i movie.wmv -ab 64 -ar 22050 -b 9570 -r 29.97 -s 256x188 -y movie.swf

and movie.swf is desynchronized once again.

If I do:
ffmpeg -i movie.wmv -itsoffet delay -i movie.wmv -map 0: x -map 1:y –ab 64 -ar 22050 -b 9570 -r 29.97 -s 256x188 -y movie.swf

nothing happens.

What am I doing wrong?

Zillions of thanks!

Note: using FFMEG.exe and executing through a PHP script, all in a Linux based web host

[Midzuki]

ASF/WMV usually means variable framerate and may contain
variable samplerate audio --- the adequate scenario for sync problems
after format conversion.

Note: using FFMEG.exe and executing through a PHP script, all in a Linux based web host

Perhaps you will have to choose a container
less unfriendly than ASF.