Firsly, I must say I'm very excited to see how 0.7.? has progressed recently (currently using 0.7.5 on kubuntu 9.04). I've been doing a lot of editing with Cinelerra and it is like using a sledgehammer to crack a nut. Most frustratingly (in Cinelerra), I can't seem to do something as simple as speed up by a factor of 2 (for example). You know, like a plain fast forward with the squeaky voices and everything - which would be trivial with film or VT.
Now I find that it is also non-trivial in Kdenlive - though I must say that the fact that when a clip is sped up it takes up less timeline space is a blessed relief (cinelerra is v. counter-intuitive on this).
Am I missing something? I simply want to take a short segment and make it run at double speed. I suppose that the audio system could be working in the frequency domain, rather than simple amplitude, but even so it shouldn't be difficult to convert to waveform and squash it up. I know how clever it is to change the pitch without changing the speed, and I know how clever it is to change the speed without changing the pitch, but I don't want that (and it never works properly anyway).
I see that I am offered the chance so change the audio clip speed in the same way that I can change the video clip speed, but when I do that the "thumbnail" disappears and I get silence. Is this what is supposed to happen? - maybe it hasn't been writen yet....
The "Rate scaler" seems to have the idea: it sounds right, but instead of speeding the whole clip up by a factor of n, it seems to chop the audio into (roughly) second-long chunks, then speed a chunk up by n, then play that chunk n times (i.e. in the second originally occupied by that chunk), then move on to the next second-long chunk, etc. I.e. overall the audio stays in the same "place". I am using this on .dv (exported from cinelerra).
This is trivial in Windoze Movie Maker ... I'd hate to think that it can do something that Kdenlive can't ;-)
Please understand that this isn't an outraged demand, I'm just surprised that such a simple thing isn't present and I wonder if instead I'm just being dense (of course, both might be true).
Any thoughts?
Share and Enjoy...
Not exactly, though it would be a great feature.
I want to be able to produce sped-up AV in the finished product, just as though I was winding film through a projector too quickly.
I guess I'm going to have to chop it into sections and render each one in turn and hope I don't have to change anything later....