[SOLVED] ffmpeg and -t / -to switches

I cannot see why -to does not work with ffmpeg - Linux Mint 19.1 64 bit with

I know it's a valid option from ffmpeg -h

Here are the details:

ffmpeg version: Quote:

ffmpeg version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2000-2018 the FFmpeg developers

ffmpeg -h: Quote:

-t duration record or transcode "duration" seconds of audio/video -to time_stop record or transcode stop time

When I use -to it doesn't stop at the time specified - it treats the switch as tho' its a duration, i.e. -t

So this command: Quote:

ffmpeg -y -ss 10 -i taking.mp4 -to 0:15.0 -strict -2 taking-10to20.mp4

actually cuts 15 seconds worth of video - I expected five seconds i.e. from 10s to 15s Quote:

Press [q] to stop, [?] for help frame= 450 fps= 79 q=-1.0 Lsize= 3669kB time=00:00:15.00 bitrate=2002.6kbits/s dup=0 drop=57

Any idea's folks, does the -to option only work with certin types of video files maybe?