Thanks for your reply, Vincent. It's very helpful and clarify. I still have one question: Is there any chance that ffmpeg developer might implement this?
Because it's not intuitive for user to compute the duration when cropping the video. And as the wiki said, `-t` and `-to` is duplicate in this case. Thanks, lp Vincent Deconinck <vdeconi...@gmail.com> 于2024年11月15日周五 17:56写道： > > > > I look up the ffmpeg document > > > You have probably missed the part of https://trac.ffmpeg.org/wiki/Seeking > that > says 'Note when "-ss" used before "-i" only: ("-ss" as input option) the > timestamps will be reset according to 0.͏ So "-t" and "-to" shall be the > same.' :-) > > [Q1] Is this really intentional? If it is, can anyone share the thought of > > this design? > > > > There is a logic, at least. > Think "-ss before -i" as two separate ffmpeg operations: > 1 : create a new file without the start > 2 : truncate the new file at a certain time > Operation 2 has no idea what the original file was, as an "input seeking" > (step1) was applied before, so it doesn't know how much was removed. > > > > [Q2] Is there a way to make the second command works like the first > > command? > > > > Not that I know of. > You should just compute the desired duration (as end-start) before calling > ffmpeg, and I suggest you use -t instead of -to in that case. They behave > the same and that removes any ambiguity for the reader. > > Vincent > _______________________________________________ > 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". > _______________________________________________ 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".
