Video from all cameras at the same time, knowing that the video cuts With the adjusted video cuts I can safely create a video that shows If that is possible then I also imagine that I can extract the wallĬlock from each video and cut the videos so they all cover the same wall Wall clock in the video through some ffmpeg option. the devices running ffmpeg.Īs all videos are captured using ffmpeg I imagine that I can embed the To use the concept of reference audio for video synchronization.īefore video capture I sync. The fact that I only have audio on one of the videos makes i difficult The ability to manipulate video so easily, without a UI, also makes for easy automation of media, especially when you combine this technique with clipping video - you get just the frames you want at the speed you want.Synchronize videos Thomas Seilund tps at netmaster.dk I recently used this slow-mo technique on a highlights video downloaded from YouTube to draw my own conclusions about a specific play.
doubling speed seems to require a different multiple. More confusing is that the atempo setting seems to require reverse logic to setpts i.e. If you care to sync the audio speed with the video speed, things get a bit more complicated: ffmpeg -i input.mp4 -filter_complex "setpts=0.5*PTS atempo=2.0" -map "" -map "" output.mp4
If you use a larger value, the video will display in slower motion. The lower the PTS value, the faster the time-lapse video is generated. It turns out all you need to do is pass in filter with a PTS ( presentation timestamp) value: Faster Video Speed ffmpeg -i input.mp4 -filter:v "setpts=0.5*PTS" output.mp4 Slower Video Speed ffmpeg -i input.mp4 -filter:v "setpts=2*PTS" output.mp4 One of my favorite TV sports illustration techniques is speeding video up (time-lapse) or slowing it way down (slo-mo replay) naturally I wanted to know how to manipulate video speed with ffmpeg. I don't have their advanced TV software or hardware, of course, but I do have a love for ffmpeg, which allows me to do everything from clip videos to change video formats, create tacky highlight videos with emo techno music combine audio and video, and more. I watch a lot of sports and recently I've become fascinated with some of the methodologies they use to illustrate events within the game.
0 kommentar(er)
