[FFmpeg-user] xfade + acrossfade usage - keeping A/V in sync

[Rob Hallam]

On Wed, 17 Jun 2020 at 16:19, Rob Hallam <ffmpeg at roberthallam.com> wrote:

> So it seems that (i) xfade shortens the inputs' combined duration
> by half the transition duration; (ii) acrossfade does not shorten
> if there is no overlap (as expected); (iii) acrossfade shortens
> by the duration of fade if there is overlap.

Pardon the self-reply, but I applied these observations
to my real-world files and they have consistent A/V
durations and seem to be in sync. Thanks to Paul for
the help.

Is it worth documenting this on the wiki, or, not to put too
fine a point on it: am I the only one who has been initially
confused by this?

Cheers,
Rob