[SOLVED] [ffmpeg] How to speed up video?

[yetanotherlogin]

Hello

I googled for this, but none of the examples work: The output isn't actually faster than the original video.

Here's what I tried:

ffmpeg -i input.mpg -filter:v "setpts=0.25*PTS" -to 00:00:15 -c:v libx264 -vf scale=640:-1 -pix_fmt yuv420p -an -threads 2 -f mp4 output.mp4

ffmpeg -i input.mpg -r 16 -filter:v "setpts=0.25*PTS" -to 00:00:15 -c:v libx264 -vf scale=640:-1 -pix_fmt yuv420p -an -threads 2 -f mp4 output.mp4

Any idea what else I could try?

Thank you.
--
Edit: More googling solved the issue: -filter:v and -vf mean the same thing, and when using two separate switches, the latter wins.

The solution is to combine the two switches in one: "-filter:v "setpts=0.25*PTS,scale=640:-1"

[Baldrick]

Thanks for posting the solution! :P.