[FFmpeg-user] apad filter in a chain of filters?

Martin Schmidt martin at herrschmidt.tv
Thu Apr 23 15:51:54 CEST 2015

> You should split them into two graphs; and then
> realize that each has a single input and a single output with the same type,
> so you should be using -vf and -af.
Great, that did it! I did not know that it was possible to put multiple filters
after  -vf and -af. That was the reason I used filter_complex. Thanks a lot!!

But this leads to another question:
When I extract the sound track from the video after using the apad filter,
the sound track is sometimes about half a frame longer, sometimes about half
a frame shorter than the video track.
It seems that apad is not exact enough down to miliseconds?

In my case this is important, because I need to create DCPs (digital cinema packages)
from the video and the separate audio track. And for a DCP it is recommended that
the audio track is exactly as long as the total number of frames of the video.

Thanks for your help again!


More information about the ffmpeg-user mailing list