If you import an AUP type project, and its project sample rate is different from your currently configured project sample rate, then the clips in the imported project are out of alignment, where the clips might be overlapping or have extra gaps in between them. And if any clips have envelopes on them then those can be shifted or stretched as well. Sometimes this importing problem is not immediately apparent, which makes it likely that you’ll miss any importing issues until later.
From what I can tell, this is due to Audacity ignoring the AUP’s project sample rate when it’s doing the import. If I manually change the app’s current project sample rate to match the existing project’s sample rate, before importing it, then the AUP project will import correctly. But it’s hard to know if any given project has a different rate, or what that rate is.
Audacity should honor the imported project’s sample rate, or at least it should ask you what you want to do if the two rates don’t match.
In that bug it looks like 16bit tracks had the wrong specs listed after importing the aup projects, when the prefs were set to 32bit. But the tracks’ audio contents seem to have been interpreted correctly.
I did some quick tests using the default prefs of 44100 and 32bit, and my imported aup projects’ tracks all show the correct specs for rates and bit depths, whether 16bit or 32bit, and whether 22050 or 44100 or 48000. So for me, the listed specs are all correct, but i guess the tracks’ audio contents were not interpreted correctly when the pref rate didn’t match the project rate.
That’s right, these were imported from 2.x aup projects. I did “open” them, but Audacity tells me it’s importing them.
And yeah, I have imported some of those older projects that had different sample rates within the same project, and (i just verified) it was the tracks where the sample rates didn’t match the app’s default rate that had the clip alignment issue. Tracks with rates that match the app’s default rate will be fine. Also, if the app’s default rate is say 32khz, and the project you’re importing has three tracks, each with 22 and 44 and 48khz rates, then all three tracks will have clips misaligned. I created a test aup project with that exact setup, and that’s what happens when you import it.
The first picture is the aup project in v2x. Note that all clips line up, and they each have the same envelope that continues to the end of the clip.
The second picture is just after opening/importing it into v375. The short clips have all shifted left or right, depending on their sample rates (the app’s default settings were 32khz at 32bit for this test). And the envelopes have also shifted, and no longer line up with the clip ends. Also of note, all tracks are 16bit, but the 48khz track is the only one that imported as 32bit. It didn’t matter if the 48khz track was first in the list, or second in the list, it always comes in as 32bit, but the other tracks come in as 16bit. I did an Amplify +9db then an Amplify -3db for all tracks, and only the 48khz track was not clipped from this, so it really is 32bit as it says it is.
