Show first and last frame longer in ffmpeg

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I am building a time-lapse animation from single frames and would like to show the first and last frames longer than the prescribe frame rate. My initial ffmpeg call looks like this and works quite well. It creates the basic time-lapse animation from single frames.

ffmpeg -r 16  -threads 0 -f image2 -pattern_type glob -i './sofi_20141022/octave2reg/IMG_*_cent.png' -c:v libx264 -s 1440x1080 -crf 24 ./Video/20141022_Partial_Solar_Eclipse_crf24_16fps.mp4

But how do I add controls to have the first and last frame show longer (i.e for sec) ??

Thanks, Gert

asked 23 secs ago

Gert Gottschalk

76

Show first and last frame longer in ffmpeg