> > 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".
