I have looked but almost always "merge" has been synonymous with cut paste and join. Is it possible to truly merge two videos frame by frame. Ie video 1 fame 1 then video 2 frame 1 and so on. Short of frame by frame cut and paste.
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Not without re-encoding, but you can use interleave() in avisynth
interleave(video1, video2) would return video1 frame 0, video2 frame 0, video1 frame 1, video2 frame 1, etc...
PS. An end to end join in video terminology is normally called "appending" or "concatenating"
Thank you for your quick response. My goal is to simulate high speed recording. My thought is append (correct?) the same video several times. Thus turning 30fps effectively into 90fps. Then slowing down the fully appended clip by to 33%. Thus slo mo without degradation of quality. Is this a silly way to do it?
appending the same video to itself will only result in replaying the same video at normal speed several times.--
"a lot of people are better dead" - prisoner KSC2-303
No that won't give the desired result
It sounds like you want a slow motion video? But without actually shooting a higher FPS ?
You have to either play a slower fps, or interpolate new frames (as if you shot a higher FPS in the first place) either by duplicating, blending or synthesizing new frames . There are many disadvantages to either of these methods - the best way is obviously shooting a higher FPS with a better camera
Yes. I've done that with Magix and power director. Too much degradation. Sorry I really am a novice. But if I had 3 frames exactly alike at 30 fps, the total time would be 3x. Played faster would be the same as th original yet slower. As long as the speed was not 3x. I was accurate above when I said slow down final clip. It should be sped up.
Did you want something like a timelapse, where only every "nth" frames are displayed (so the video looks very fast)
Or did you want slow motion video? (video looks smooth and slow)
Again. I think terms are where I am confused. Append may not be correct. I'm not putting two together end to end but inserting the same frames out of phase. To result in v1f1v2f1v1f2v2f2......
Smooth but slow.
Ok - Slow motion means you have more frames, but usually played back at the same FPS
So if we have a 1 second, 30 fps clip. There are 30 frames. All those frames are displayed in 1 second.
If we make it 3x slow motion, the same clip now has 90 frames, but still plays 30fps. Thus the duration is now 3 seconds long
The problem is how to generate those "extra frames" without using a more expensive camera
There are 3 principle methods:
1) duplicating frames - choppy
2) blending frames - choppy & blurry
3) motion interpolated frames - smoothest but prone to edge morphing artifacts
There are pros/cons to each approach
This has been discussed several times before. Read this thread, and download the examples from vimeo and the attached video for illustration
The problem is how to get those "out of phase" frames. In other words, how do you generate all those extra "in between" frames? Or 3 different clips
Interleave(vid, vid, vid)
Is the same as:
ChangeFPS(3x) #where 3x is three times the original frame rate
It will give you slow but jerky video. I take it what you're looking for is something like this:
You either have to shoot with a high frame rate camera (they go up to millions of frames per second and costs millions of dollars, there are a lot of consumer level cameras that shoot 120 to 600 fps) then play it back more slowly, or you can try using motion interpolation software which looks at motions in the frame and tries to generate in between frames based on that motion.
Last edited by jagabo; 13th Apr 2012 at 18:39.