Am 05.04.2021 um 11:58 schrieb Cecil Westerhof via ffmpeg-user:
Michael Koch <[email protected]> writes:
Am 05.04.2021 um 01:48 schrieb Cecil Westerhof via ffmpeg-user:
I have to cut out a part of a video, crop it and blackout two parts.
I do this with:
ffmpeg -y \
-ss 00:19:49 \
-i 2021-03-25ToastmastersClubAvond.mp4 \
-to 442 \
-vf "
crop = 1440:1080:240:0
,
drawbox=enable='between(t, 0, 2)' :
color = black :
w = in_w :
h = in_h :
thickness = fill
,
drawbox=enable='between(t, 339, 342)' :
color = black :
w = in_w :
h = in_h :
thickness = fill
" \
-acodec copy \
-vcodec libx264 \
-crf 23 \
speechClean2.mp4
The reason I do -to in the output is that in this way the metadata
concerning the video length is less out of whack.
I was wondering if this is a good way, or that it could be done
better?
Also, beside the timestamps the parameters for drawbox are the same.
Is there a way that I do not have to repeat them?
drawbox=enable='bitor(between(t, 0, 2),between(t, 339, 342))'
Works like a charm.
Strange thing is that it seems to be much faster. About 20%. To much
to be because of different load I think.
But I am not complaining. ;-)
If you want to cover the whole frame size, you could also use this (for
50% gray):
eq=enable='bitor(between(t, 0, 2),between(t, 339, 342))':contrast=0
or add :brightness=-0.5 if you want black.
It might be faster than drawbox.
Michael
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