[FFmpeg-user] "Padding" start and/or end of video

[Paul B Mahol]

On 10/7/19, Richard Branham <branham.richard at gmail.com> wrote:
> I have four mp4 recordings of a video conference feed.  After the
> conference ends, the files are multiplexed into a single video with each of
> the original files displayed in a quadrant of the output window.  This
> works as expected if all four videos are of the same duration.
>
> If the primary user starts recording at time T0 and the other 3 join at
> X seconds later, I need the individual videos in the muxed file to start at
> T0 + X.  I also need the primary user's video to continue even after a
> subsequent user leaves the conference and their video ends early.
>
> My first thought is to lengthen the shorter videos by concatenating a black
> screen to the beginning and/or end to make the shorter video the same
> length as the primary one and to offset the short video to the correct
> point in the conference recording.
>
> Is this the best way to go, or is there a more straightforward approach?

Yes, try tpad filter.

>
> Thanks!
> Richard
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