> On Mar 5, 2021, at 2:00 PM, Michael Koch <astroelectro...@t-online.de> wrote: > > Am 05.03.2021 um 20:33 schrieb Steven Kan: >>>>> 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 > > try this command line: > > ffmpeg -i input1.mp4 -i input2.mp4 -filter_complex > "[0]tpad=start_duration=50[a];[a][1]hstack” out.mp4
Thank you! That worked perfectly, and now that I understand the syntax, this works as well (to pad the end of the second track by 15 sec: ffmpeg -i Input1.mp4 -i Input2 -filter_complex "[0]tpad=start_duration=50[a];[1]tpad=stop_duration=15[b];[a][b]hstack" Out.mp4 _______________________________________________ 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".
