Gear / Technical Help > Post-Processing, Computer / Streaming / Internet Devices & Related Activity
Audacity - New Time Stretching Abilities, etc
blakenan:
I'm on a Mac, trying to use Audacity to mix a SBD and Aud source recorded on different decks. As expected there is a small amount of drift over the course of a 2 hour show. I'm trying to stretch the shorter source by a factor of 1.000022759 (drift was about 150ms over 2 hrs). As suggested above, the current version of Audacity (v3.4.2) limits precision to 3 digits to the right of the decimal when specifying the "Speed Multiplier" in the "Change Speed and Pitch" options. I tried running v2.1.0 but, as expected, it is not compatible with the latest MacOS.
Any suggestions on other ways to stretch/mix these sources? I've been out of the multi-source game for a long time...
Chilly Brioschi:
My apologies for the lack of precision in my posting ...
Definitely email the developer's buglist
nulldogmas:
--- Quote from: blakenan on December 08, 2023, 10:50:12 AM ---
Any suggestions on other ways to stretch/mix these sources? I've been out of the multi-source game for a long time...
--- End quote ---
I use Sound Studio for this, but it costs money (I think around $30?).
EDIT: Actually $50 now, ugh. Its time stretching goes to lots of decimal places, though, and it has some other nice features.
https://apps.apple.com/us/app/sound-studio/id405537804?mt=12
boomfizzle:
--- Quote from: blakenan on December 08, 2023, 10:50:12 AM ---Any suggestions on other ways to stretch/mix these sources? I've been out of the multi-source game for a long time...
--- End quote ---
Stretch Markers in Reaper. More specifically, Magnetic Stretch Markers. The relevant part comes at around 1:10 here: https://www.youtube.com/watch?v=pjKBp1b8n6o
(when I saw those wavs moving around together my jaw dropped)
I did a little more digging and found this trick, to create Transient Guides automatically https://youtu.be/GRO-ecLZqmw?t=448.
I used the transient guides to automatically locate the identical transients between the waveforms and used Magnetic Stretch Markers to line them up (snap and grid disabled) at the beginning and the end of the show. Once those were synced up perfectly, I just started scrubbing through the files looking for stuff that seemed out of alignment. I'd zoom in, look for a pair of transient guides that seemed to match up, click them to automatically create stretch markers, and I'd line them up using the Magnetic trick (zoomed all the way in to the level of plotted samples) and try again. As long as I left the playhead within the stretch-markered region I was working on, every additional sync point would add additional clarity and phase alignment on playback. If I added a new sync point and playback got wonky, I'd delete that set of markers and dive back into the transient guides, looking for a better match nearby. Then I just cleared the Transient Guides when I was done to leave it with a cleaner look.
blakenan:
All... Thanks for the help. I think I may have found a way to use Audacity. Seems like this post in the Audacity forums might be a work around: https://forum.audacityteam.org/t/more-precise-speed-change-solved/65245/5. I'll try and report back over the weekend.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version