> On Mar 17, 2021, at 11:57 AM, Michael Koch <astroelectro...@t-online.de> > wrote: > > Am 17.03.2021 um 19:31 schrieb Steven Kan: >>> On Mar 6, 2021, at 11:22 AM, Steven Kan <ste...@kan.org> wrote: >>> >>>> 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. >>>> 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 >> More on this! >> >> tpad=start_duration works to delay the start of one video, but now I need to >> fix the audio sync. For example this command: >> >> ffmpeg -i TrailDown.mp4 -i TrailUp.mp4 -filter_complex >> "[0]tpad=start_duration=2.5[a];[a][1]hstack" -vcodec libx264 Coyote2Up.mp4 >> >> results in this video: >> >> https://www.youtube.com/watch?v=_PDPONEU3YA#t=35s >> >> Only the left half (TrailDown) camera has a microphone, and it’s apparent >> that the audio sync is off by the same 2.5 seconds that I’ve delayed its >> video. You can hear the female coyote (with the stumpy tail) scratching the >> ground 2.5 seconds before she actually does it. >> >> What flag should I add to also delay its audio? Thanks! > > Add the "adelay" filter to the filter chain: > adelay=2500
Fixed!!! https://youtu.be/89HAnwZuO9g Thank you, _______________________________________________ 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".
