Michael Koch <astroelectro...@t-online.de> writes: > Am 05.04.2021 um 11:58 schrieb Cecil Westerhof via ffmpeg-user: >> Michael Koch <astroelectro...@t-online.de> 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.
I will try that out later. At the moment I am working with the different preset values. It seems that veryfast is still the best. And that you really should not use ultrafast. -- Cecil Westerhof Senior Software Engineer LinkedIn: http://www.linkedin.com/in/cecilwesterhof _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
