>>> >>> I’d like to assemble these videos, side-by-side, but synced in time, which >>> means the TrailDown video needs to start 50 seconds after the TrailUp >>> video. The TrailDown side can be black/blank, or it can be stuck on the >>> first frame of its video while the right side plays for the first 50 >>> seconds; it doesn’t matter to me. >>> >>> I’ve tried all of the following: >>> >>> -itsoffset 50 -i TrailDown.mp4 -i TrailUp.mp4 >>> -itsoffset 50 -i TrailDown.mp4 -itsoffset 0 -i TrailUp.mp4 >>> -i TrailDown.mp4 -itsoffset -50 -i TrailUp.mp4 >>> >> >> see tpad filter, need recent version. > > Thanks! I have figured out the syntax to pad a single video with tpad, e.g.: > > ffmpeg -i > /Users/steven/Downloads/Record/DownLoad/TrailDown_ch1_20210304010952_20210304011838.mp4 > -filter_complex "tpad=start_duration=50" tPadOut.mp4 > > but I’m having trouble with the syntax to delay only one of two videos in an > hstack filter: > > ffmpeg -i > /Users/steven/Downloads/Record/DownLoad/TrailDown_ch1_20210304010952_20210304011838.mp4 > -i > /Users/steven/Downloads/Record/DownLoad/TrailUp_ch1_20210304010838_20210304011506.mp4 > -filter_complex "tpad=start_duration=50[v0];hstack=inputs=2” Coyote2Up.mp4
I brute-forced it by using tpad to pad the first video by itself, and then I used hstack to glue them together. Not the most efficient way of doing things, and I think that induces 2 generations of transcoding, so ideally I’d like to know how to do it properly in the future. But here’s the end result: https://www.youtube.com/watch?v=ByUHKRtA6Zo&list=PLm4gRKwvTste1lnrHLIHWMZ1WpJSA1vb9&index=2 _______________________________________________ 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".
