Re: [FFmpeg-user] ffmpeg create wrong time information
On 2021-12-21 08:14 pm, Cecil Westerhof via ffmpeg-user wrote: I have the recording of a zoom meeting where I need to cut out a portion from and the first little bit has to be blacked out. I use the following command: ffmpeg -y\ -ss 00:26:05 \ -to 00:44:04 \ -i input.mp4 \ -vf " drawbox=enable='between(t, 0, 1.6)' : color = black: w = in_w : h = in_h : thickness = fill "\ -acodec copy \ -vcodec libx264 \ -crf 23 \ -preset veryfast \ output.mkv This creates a seemingly correct file, with one little problem: the time starts at 00:00:27 and ends at 00:18:26. (As displayed by the player mpv.) This should work. Where are the keyframes in the video stream? Regards, Gyan ___ 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".
Re: [FFmpeg-user] ffmpeg create wrong time information
Bouke / Videotoolshed writes: >> On 21 Dec 2021, at 19:37, Cecil Westerhof via ffmpeg-user >> wrote: >> >> Cecil Westerhof via ffmpeg-user writes: >> >> After some experiments I solved it by putting -ss and -to behind -i >> and not forgetting to alter the between values. >> But this takes about a third more time. >> Is there be a better solution? >> >> I am now using: >>ffmpeg -y \ >>-i input.mp4 \ >>-ss 00:26:05 \ >>-to 00:44:04 \ >>-vf " >> drawbox=enable='between(t, 1565, 1566.6)': >>color = black : >>w = in_w : >>h = in_h : >>thickness = fill >>" \ >>-acodec copy \ >>-vcodec libx264 \ >>-crf 23 \ >>-preset veryfast \ >>output.mkv > > I think you are inserting black, not overlaying (blanking) the > video. Try -vf overlay. If I look at overlay, it says: Overlay one video on top of another. I only want to block video for a short while because someone who should not be visible is visible. > With -ss before input, it will do a faster search, you might have to do > a bit of math on the enable= range, but that will become very obvious > with a small test. The problem is that (in this case, I have used it without problems) with -ss before the video there is 27 seconds of (hidden) audio. If the video started 27 seconds I could understand it. -- 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".
Re: [FFmpeg-user] ffmpeg create wrong time information
> On 21 Dec 2021, at 19:37, Cecil Westerhof via ffmpeg-user > wrote: > > Cecil Westerhof via ffmpeg-user writes: > > After some experiments I solved it by putting -ss and -to behind -i > and not forgetting to alter the between values. > But this takes about a third more time. > Is there be a better solution? > > I am now using: >ffmpeg -y \ >-i input.mp4 \ >-ss 00:26:05 \ >-to 00:44:04 \ >-vf " > drawbox=enable='between(t, 1565, 1566.6)': >color = black : >w = in_w : >h = in_h : >thickness = fill >" \ >-acodec copy \ >-vcodec libx264 \ >-crf 23 \ >-preset veryfast \ >output.mkv I think you are inserting black, not overlaying (blanking) the video. Try -vf overlay. With -ss before input, it will do a faster search, you might have to do a bit of math on the enable= range, but that will become very obvious with a small test. Bouke ___ 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".
