Frage von whoo:
Hello ..
I have with a Canon XL2 in 25p mode, a music video rotated. The speed of the songs I have in the run up to 125% increase. Accordingly, the artist performs the song faster.
In After Effects 7.0, I have the material means of time stretching back to 25% slow. And with frame blending it looks very smooth from synonymous.
If I use the video now s.Anfang export runs it perfectly, at the proper speed and synchronously with the song still exists in the background. After about 1 min this film material is noticeably slower than the present background sounds. Say the song is not lip-sync. After about 2 min (the end) is the slowing down even more noticeable.
Why?
I have it in different players tested in the interlaced and progressive mode exported. Furthermore, I have the background sound with the original song is replaced, but the same effect also. What can I even try?
Thank you very much!
Antwort von Mylenium:
Well your time is certainly not stretching quite accurately. Maybe they just take 80% in real terms rather then 81% or some sort. This should, however, with time distortion (time-remapping), or the Timewarp filter and a few additional keyframes easily into the handle can get. The simple linear Zeiddehnung for something I would not take anyway because of the adverse bene ...
Mylenium
Antwort von bjoerni:
stretching back through time by 25% slows. This is precisely the problem. You did wrong back. If we assume (because it is simply expected it), you 100frames per second source material. Then you accelerate by 25%, which then corresponds to 75fps (frames less per unit of time = faster video). AFX get 75fps now. The speed you back to 25%. But 25% of 75fps approximately 19fps. So you have completed your round and back only your original 94fps of 100fps left. Ergo, your video 6fps (generally around 6% faster) than before play.
Is my reasoning?
Antwort von bjoerni:
.. okay, I've expected the other direction. acceleration after the haste of course 125fps. which 25% are about 31fps. prefer the 31fps of 125fps s.haste ultimately synonymous but 100fps instead of 94fps (edit: more slowly than before).
Antwort von whoo:
So I have not calculated out and her ... I've slowed down only once ...
The fact is, if I film material in the original play, it is synchronously for audio signal, if I slow down to 25% of synchronicity is the audio signal to no longer exists ... as I already have written, it is beginning to synchronously, but towards the end it will be equal ..
I am just surprised that after effects, the video material and the audio signal is slower, but the video material, a tick slower makes .. whereby the flutes synchronicity goes ..
with the time-distortion, I would certainly somehow achieved, but this is the solution?
Antwort von bjoerni:
I'm in my reflection on the assumption that you have the audio track but not edit the video editing. thus, 6% slowdown in the videos explainable, and the slowdown certainly only get with the times with, as the "gap" between sound and video will be greater the longer it runs.
start in the thread you write the way:
The speed of the songs I have in the run up to 125% increase. That is why I am already one of the outward and back again expected to account ..
Antwort von whoo:
So again just my approach:
- The song using adobe audition to 125% accelerated
- Normally rotated with 25p video song (125%) in the background (Boombox)
- The video recorded
- The video + audio signal by time expansion in after effects to 125% stretched / slows
thus no preference what speed the song in the background, in accordance with the time extension, the audio signal is no longer synchronously on the video!
and if I now put the unedited song, joins the same effect!
Antwort von bjoerni:
after the time extension, the audio signal is no longer synchronously on the video! what if:
* Fool you just slow down the video material
* And the audio track on audition slow
-> Audio still asynchronously?
