FFMPEG scaling problem?

[Unknown01]

I want to scale a video and burn the subtitles in it.

According to FFMPEG documentation:

https://trac.ffmpeg.org/wiki/HowToBurnSubtitlesIntoVideo
https://trac.ffmpeg.org/wiki/Scaling

The correct syntax would be:

ffmpeg -i video.mkv -c:v libx264 -c:a ac3 -crf 14 -ss 00:03:15 -to 00:03:37 -vf subtitles=video.mkv, scale=720:-1 output.mp4

But it doesn't work, it seems ffmpeg doesn't recognize scale=720:-1 even if the documentation says it should work.

Where is the problem in the syntax?

[Selur]

subtitles=video.mkv, scale=720:-1

remove the whitespace
also for the future: post the output ffmpeg posts, since it usually does report what's wrong,...

[Unknown01]

I see, thanks for the help.