1

I want to freeze some frames in a video so that it gives a buffering video type look. Also the audio should freeze with the video.

2

Assume there are three pauses of 3 seconds each at 5s, 12s and 20s of the original video. Here's the basic form of the command,

ffmpeg -i in -vf "setpts='PTS-STARTPTS + gte(T,5)*(3/TB) + gte(T,12)*(3/TB) + gte(T,20)*(3/TB)'" -af "asetpts='PTS-STARTPTS + gte(T,5)*(3/TB) + gte(T,12)*(3/TB) + gte(T,20)*(3/TB)',aresample=async=1:first_pts=0" -vsync cfr out

4
  • I get the following error while running the command: ffmpeg -i abc.avi -vf "setpts='PTS-STARTPTS + gte(t,5)*(3/TB) + gte(t,12)*(3/TB) + gte(t,20)*(3/TB)'" -af "asetpts='PTS-STARTPTS + gte(t,5)*(3/TB) + gte(t,12)*(3/TB) + gte(t,20)*(3/TB)',aresample=async=1:first_pts=0" -vsync crf out.avi error: Expected number for vsync but found: crf if I add -vsync 0, then error: Unable to find a suitable output format for 'crf'
    – mumtaz
    May 23 '19 at 5:21
  • It's not crf, See answer.
    – Gyan
    May 23 '19 at 5:35
  • thanks.. but there is still some error. I have posted it in the answer below.
    – mumtaz
    May 24 '19 at 9:16
  • Your command is missing the * in gte(t,5)*(3/TB) and in other expressions.
    – Gyan
    May 24 '19 at 9:28
0

The code by @gyan didn't work out for me, I found another (longer) way to do it:

I extracted the audio file from the video first using:

ffmpeg -i input.mp4 -vn -ab 128 audio.mp3

then combined them together with an offset:

ffmpeg.exe -i "input.mp4" -itsoffset 3 -i "input_audio.wav" -map 0:v -map 1:a -c copy "output.mp4"
2
  • Did you add the *?
    – Gyan
    May 24 '19 at 10:54
  • **yes I did try your code, but it shows error **: ffmpeg -i sb.mp4 -vf "setpts='PTS-STARTPTS + gte(t,5)*(3/TB) + gte(t,12)*(3/TB) + gte(t,20)*(3/TB)'" -af " asetpts='PTS-STARTPTS + gte(t,5)*(3/TB) + gte(t,12)*(3/TB) + gte(t,20)*(3/TB)',aresample=async=1:first_pts=0" -vsync cfr outsb.mp4
    – mumtaz
    May 26 '19 at 6:11

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