Change audio speed without change in pitch?

[Terfyn]

Just revising an old post. I have just finished editing and rendering a video of a visit to Folly Farm and Heatherton near Tenby. I used two pieces of pre recorded music to cover each part.
Both pieces of music needed adjusting to fit the video clips and, using the method of pressing Shift while changing the clip length, I matched the audio to the video. As expected there was a change in the speed of the music but, at no time did the pitch alter. Bear in mind that a change of pitch would sound like a change of key or one part being out of tune to the next but this never happened, the pitch remained exactly the same through both music clips.

[Djard007]

Try video recording a musician playing an instrument then speed up a segment without altering the pitch. It cannot be done in VS9, without severely degrading the audio quality. And it cannot be done at all if you use the Variable Speed tool. You must demultiplex the audio, use a DAW to edit the segment, concatenate it in synchrony then remux.

[TroyTheTech]

Just revising an old post. I have just finished editing and rendering a video of a visit to Folly Farm and Heatherton near Tenby. I used two pieces of pre recorded music to cover each part.
Both pieces of music needed adjusting to fit the video clips and, using the method of pressing Shift while changing the clip length, I matched the audio to the video. As expected there was a change in the speed of the music but, at no time did the pitch alter. Bear in mind that a change of pitch would sound like a change of key or one part being out of tune to the next but this never happened, the pitch remained exactly the same through both music clips.

If I may pop in, Terfyn this only was possible if you did not alter the speed past 50%. In some video and audio editing applications, there is a note that informs the user that altering past this amount will result in a pitch change. Below that threshold, 'pro-sumer' level editors attempt to maintain pitch. This can be seen by using your click-drag method (holding SHIFT) and altering beyond a 50% change in length/speed (or doing so in Speed Adjustment/Time Lapse).

Thank you Trevor. Are those your hands? Nice Jazz style.

I got your clips to play OK. And with some help I managed to modify video speed without altering the audio pitch, using the Speed/Time-lapse feature. I understand that in X10, Time Remapping can be used to achieve the same result.

Perhaps no so noticeable when video is slowed, but when speeding up video, the audio quality is dramatically lowered, unacceptable in music. I found a workaround, but it is laborious. I'll share it once I type up the steps involved, wherein the audio quality is 99.9% preserved.

Cheers!

If I may add my own note about the audio: after a few tests I too find that the audio quality degrades quite a bit, even within the 50% amount in VS, sadly. Everything begins to sound as if it is 'underwater'. Possibly the only way to avoid this is to utilize an external audio editor (for now).

[Terfyn]

If I may pop in, Terfyn this only was possible if you did not alter the speed past 50%. In some video and audio editing applications, there is a note that informs the user that altering past this amount will result in a pitch change. Below that threshold, 'pro-sumer' level editors attempt to maintain pitch. This can be seen by using your click-drag method (holding SHIFT) and altering beyond a 50% change in length/speed (or doing so in Speed Adjustment/Time Lapse).

If I may say so this is fairly obvious. The original post was to speed up a musicians playing to make them sound more professional. I would not expect the recorded musician to be so bad as to require a 50% speed increase.
I use audio speed changes to align a piece of pre recorded music with a length of video. It makes sense to choose the music not only for its appropriateness but also for its approximate length to match the video. The point I was making from the beginning of this post is that a digital recording, unlike an analogue recording, maintains its note values even when it is speeded up or slowed down within reason.