Yes, it does. I’ve compared it on Audacity. Audacity’s “Percent Change” counter doesn’t measure it by just two numbers like in 75% as you wrote it. It’s like “1.000” just as how its “Speed Multiplier” has it and how the Speed counter in Shotcut is now. It measures the speed control differently than the “Speed Multiplier”. It also allows for negatives which in “Percent Change” matters since that’s how one can correct PAL speed up.
To give a specific example, in Audacity I put in the audio file of a movie with a PAL speed up. Its running time:
I used the Speed control on Shotcut (18.07.02) to set it at 0.959 and it came out:
I ran it with an equivalent video that does not have PAL speed and it was at sync at first but went out of sync as time went on.
I went on Audacity and used 0.959 also on its “Speed Multiplier” and it came out:
It went out of sync again after a bit.
Then I used Audacity’s 2nd option “Percent Change” with a figure of -4.094 and the file came out to:
And this time it ran completely in sync from start to finish. The Speed control options in both Audacity and Shotcut cannot hit the above time. The difference between 0.959 and 0.958 in Shotcut is about 7 seconds so with the current options it’ll just go over or under the speed needed.
An equivalent Percentage feature in Shotcut as a 2nd option would be fantastic so that way conversion of both video and audio from PAL speed could be done in one program. And aside from PAL speed up issues, one could end up getting faulty video and/or audio that needs speed correction that needs more specific timing and that’s where a Percentage option would be most useful which again could all be done all in one program rather than having to use multiple ones for video and audio. Shotcut’s almost there for this. I hope a feature like this can be added.