[FFmpeg-user] xfade + acrossfade usage - keeping A/V in sync
ffmpeg at roberthallam.com
Wed Jun 17 11:50:20 EEST 2020
On Tue, 16 Jun 2020 at 23:56, Paul B Mahol <onemda at gmail.com> wrote:
>> TR1=764.3 # input 0 duration - 1 second
>> TR2=1250.498 # input 0 + input 1 duration - 1 second
> I believe this two should be - 2 seconds instead. Because both
> transition durations for two xfade and acrossfade filters is 2
Thanks for the reply Paul, I will try that.
My reading of xfade is that the transition start point should be
half the duration from the end- the example on the wiki is 4.5s
of a 5s input for a 1s transition. I am less sure about acrossfade,
but thought it worked similarly.
In either case diagram terms I figured they operated like:
[AA AA AA AA][BB BB BB BB]
[AA AA AA AB BA BB BB BB]
ie neither should change the length of the inputs they operate on.
Is that a mistaken assumption perhaps?
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