> > Ffmpeg -i v1.mp4 -i v2.mp4 -filter_complex > "xfade=transition=hlslice:duration=4:offset=7" -pix_fmt yuv420p output.mp4 > > > > So far so good. The transition happens between 7 and 11 of the new video. > > > > Now I want to create a new video by extracting the part that has the > transition, with an additional second on each side, so I want to cut from 6 > to 12 and I use the following: > > > > Ffmpeg -ss 6 -i input.mp4 -to 6 -c copy output.mp4 > > > > I expect a final video with 6 seconds, showing the transition starting at 1 > and ending at 5. Instead I get a video with 9 seconds and the transition > seems to start at 5. >
What you get is technically correct because ffmpeg will cut only at key frames when you use the copy option. IMHO, You have two options: 1. reencode the video rather than copying to get exact cutting points or 2. use a smaller GOP size with the transitions command on v1 and v2. Then you get more keygrames (with a heavy overhead, ofcourse) i hope this helps. DEF _______________________________________________ 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".
