Roundtip from Izotope RX Advanced not working

It used to work automatically. I would send to RX from the dropdown menu in Fairlight, save in RX, switch back to DR and the audio file would update. Now it sends to RX but doesn't update the file in DR after save.

And...

After I bring back the file manually, it doesn't line up with the original file. It looks like it was stretched.

Further "investigation" brings me to the conclusion that DR exports the file incorrectly. Like in a different sample rate.

When I use the "reveal" method in User preferences and bring back the created file from DR it is also longer.

The 'exports incorrectly' and 'file is longer' conclusion/observation is interesting, but the external audio processing has always included extents beyond the clip (i.e., handles) if memory serves. We've reported the bug with External Audio Processing before. It appears to only affect macOS systems. Here's the link to the thread:

https://forum.blackmagicdesign.com/viewtopic.php?f=38&t=182020#p951950

Sorry, didn't realise that there were 2 threads already on the subject and you are correct. These are handle lenghts.

Sorry and thank you for pointing it out to me.

You're welcome. I'm glad you chimed-in. My original post went for quite a long time before the bug was confirmed by others. Hopefully we will see a fix in the next beta drop. Cheers!

I thought both BMD and iZotope state that RX is not yet meant to round-trip with Resolve? Yes, it might seem to work, but I think not officially supported. Perhaps this has changed. That said some of the iZotope modules are supported for round-trip.

I have always taken copy of original audio file (usually from Sound Devices MixPre) or an audio file exported (bounced) from Resolve and used that in RX (stand-alone), then take copy of the worked on file back into Resolve. This way I also maintain the originals.

Well, you are mistaken and you've been doing it the hard way. I've been working successfully with Resolve to RX for years. It might interest you and the BMD developers to note that the problem described here has nothing to do with iZotope or RX specifically. The problem is that when the export file is created and passed to the external audio processor, it is not also simultaneously layered over the original clip, nor linked into the media pool. These actions are meant to occur irrespective of the external process target. Because of this, it would seem that no external audio processor would work with the latest 18.5 beta.

System Requirements for RX 10 from the iZotope site:
https://www.izotope.com/en/products/rx.html


DAWs/NLEs:

Logic Pro 10.6.3 - 10.7.x, Pro Tools 2021 - 2022, Ableton Live 11, Cubase 11 - 12, Nuendo 12, Studio One 5, Reaper 6, FL Studio 20, Audition CC 2022, Premiere Pro CC 2022.


Also check this page from iZotope about Hosts:
https://support.izotope.com/hc/en-us/ar ... 8103717905

I'm not sure why you are pointing to iZotope pages when this issue has likely nothing to do with any particular external process. It is true that iZotope plugins, including those associated with RX are not qualified for Resolve as a host, but that's quite a different matter.

Did you know, for example, that Resolve does not use RX Connect to establish a connection to the RX Editor? If it did, then this would be a problem because RX Connect is an unqualified plugin. Instead, Resolve uses a command line execution of the RX Editor executable, passing to it the name of the file to process. This file is a copy of the source clip on the Fairlight page.

Presently (with 18.5b3), Resolve creates the copied audio clip, successfully launches the RX Editor and passes the copied audio file path to the RX Editor. The RX Editor then opens the audio file for editing. The 'iZotope' part of this process works flawlessly.

What doesn't work is that Resolve does not add this copied file to its media pool (as a new source clip), nor does it layer this new source clip on top of the original source clip. The failure appears to be solely within the realm of Resolve and not iZotope.

System Requirements for RX 10 from the iZotope site:
https://www.izotope.com/en/products/rx.html

This is the process we are referring to...