1

Following up on this question: ffmpeg drawtext timecode source framerate

I want to change the frame rate of a file, scale it down and burn the timecode in one operation.

ffmpeg -i in.mpg -r 24 -vf "scale=-2:360, drawtext=timecode='00\:00\:00\:00': r=24:" out.mpg

When I do this, the timecode is relative to the source frame rate, not the output. So if my input FPS is 59.94, I get this timecode sequence:

00:00:00:02
00:00:00:04
00:00:00:07
00:00:00:09

How can I tell drawtext to use destination frame numbers instead of source?

2

Use a filter to reduce the framerate beforehand

ffmpeg -i in.mpg -vf "fps=24,scale=-2:360,drawtext=timecode='00\:00\:00\:00': r=24" out.mpg
  • Thank you @Gyan! Your answers are fast and accurate. So now I have a followup question: if I were only changing the frame rate, would there be any difference between -r 24 and vf fps=24? – iter Jun 4 '18 at 16:07
  • 1
    There was a difference in frame selection logic for the first frame but I believe it was fixed recently. – Gyan Jun 4 '18 at 16:13

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