Hello, I have several videos that were recorded in a webinar type setting.
Each person in the webinar was recorded with their own feed. I then receive a zip file with each video recording and a JSON file with a start / stop time offset. Example: Video 1: "filename" : "823ef68a-cb1c-4636-bdfb-ed3d9611a755.webm", "size" : 4766189, "startTimeOffset" : 17599, "stopTimeOffset" : 72696, Video 2: "filename" : "a920ab58-a42d-49fe-a239-b27497b22bb1.webm", "size" : 6378071, "startTimeOffset" : 1439, "stopTimeOffset" : 74655, I could have anywhere from 2 to 10 videos per job. For faster processing I convert the videos to Mp4 I have had some luck in merging the videos into 1 using hstack but I cannot seem to figure out how to get them merged into 1 video with the different time offsets. Here is what I have so far which gets me close but doesn't take into account the different offsets so everyone is talking over each other and out of order etc. ffmpeg -i /Users/randy/Downloads/archive23/a920ab58-a42d-49fe-a239-b27497b22bb1.mp4 -i /Users/randy/Downloads/archive23/823ef68a-cb1c-4636-bdfb-ed3d9611a755.mp4 -filter_complex \ "[0:v][1:v]hstack=inputs=2[v]; \ [0:a][1:a]amerge[a]" \ -map "[v]" -map "[a]" -ac 2 -y /Users/randy/Downloads/archive23/output.mp4 Another tricky thing is that if the conference was 1 hour long, someone could show up 15 minutes late or leave 15 minutes early. I thought ffmpeg -itsoffset n could be of help but https://stackoverflow.com/questions/55492772/stacking-different-length-videos-not-working-with-ffmpeg-and-itsoffset this post says that hstack doesn't sync with timestamps. They do give an example in the stack overflow post: ffmpeg \ -i smaller.mp4 \ -i bigger.mp4 \ -filter_complex \ "[0]tpad=start_duration=17[left];\ [left][1]hstack=inputs=2;\ [0]adelay=17s|17s[lefta];[lefta][1]amix=2" \ -c:v libx264 -crf 23 out.mp4 Any ideas on the best way for me to proceed? Thanks, Randy _______________________________________________ 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".