Fastest way to Add Image into Video using FFMPEG at First 20 Seconds

Question

Anyone knows the fastest way to add image into video at first 20 seconds? I have tried it, but it seemed like FFMPEG re-encoded the whole video even after 20 seconds which took a long time..

here my code:

ffmpeg -i input.mp4 -i logo.png -filter_complex "overlay=5:5:enable='between(t,0,20)'" output.mp4

Answer 1

Fast

Use a faster -preset and stream copy (re-mux) the audio instead of re-encoding it:

ffmpeg -i input.mp4 -i logo.png -filter_complex "overlay=5:5:enable='between(t,0,20)'" -preset fast -c:a copy output.mp4

Faster

You could encode the ~20 segment conforming to the same parameters as the main input, then concatenate with the concat demuxer in stream copy mode. However, this will be troublesome because conforming parameters is not trivial for most users, the concat inpoint directive is not guaranteed to seek accurately with non-intra inputs, and you could end up with timestamp issues anyway.

Fastest

The most fastest way is to use a player to overlay the logo:

mpv --lavfi-complex="[vid1][vid2]overlay=5:5:enable='between(t,0,20)[vo]" video.mp4 --external-file=image.png