Proxy Footage Wrong Aspect When Relinking

I am editing a documentary that was shot in 4K DCI, some ProRes, some Canon mxf. I decided after doing a little bit of light work that things would go smoother if I generated proxies. I made 1080p proxies of everything with the media manager, but if I selected the automatically relink to new media function, Resolve would crash before relinking. I opted to just generate the proxy media with the exact same name and file type as its source (via the media manager) and manually select clips and relink them.

However, for the MXF clips, when i relink my 4K clip to the proxy, it is squeezed. It looks almost like anamorphic footage before setting your pixel aspect ratio (don't worry i checked that mine was correct).

Has anyone else experienced this - Relinking to proxy footage then the size is interpreted incorrectly?
If i reveal the clip in media storage/view in finder, it appears normal.

I have checked all the input sizing, pixel aspect ratio, and other usual suspects. What is especially strange is that it is only the .MXF footage, the .MOV ProRes proxies link and scale fine.

I found something of interest in this thread regarding how when you relink the metadata doesn't seem to update. It still says my footage is 4K even though I have linked to the 1080 footage. Though I am not sure if this is the cause since the .mov footage works fine and is the same size.

If I reimport the footage it is correctly scaled, however I have made lengthy notes with markers at the clip level so reimporting is not an option unless someone can show me how to transfer markers from one clip to another.

I am running Resolve 16.2.7, I tried importing into 17 and it did not solve the issue.

Any thoughts?

For version 16, use Optimized Media. I find that Cineform at 1/4 resolution works well.

For 17, use the internal Proxy process. DNx at 1/4 should work well.

For version 16, use Optimized Media. I find that Cineform at 1/4 resolution works well.

For 17, use the internal Proxy process. DNx at 1/4 should work well.

The optimized media isn't really an option since I cannot see where it is stored, and it does not behave as a usual media file... It is not really a viable solution for us. I also will be working off a smaller drive that needs to only contain the proxies. AFAIK optimized media isn't much of an option unless you are still online with your camera originals.

So there's a couple "givens" from which I normally offer advice.

1. You're using a well configured desktop.
2. You have multiple internal hard drives sufficiently large for the work.

Additionally, you do set where both Optimized Media and Proxies (in 17) are stored.

And finally, when what you want doesn't work, you may need to consider changing that "want" to something that does work.

(That last bit is actually why I'm using Resolve and not Premiere Pro.)

So there's a couple "givens" from which I normally offer advice.

1. You're using a well configured desktop.
2. You have multiple internal hard drives sufficiently large for the work.

Additionally, you do set where both Optimized Media and Proxies (in 17) are stored.

And finally, when what you want doesn't work, you may need to consider changing that "want" to something that does work.

(That last bit is actually why I'm using Resolve and not Premiere Pro.)

1 and 2 are certainly true.

Yes, I know you can set the location of Optimized Media in Resolve, but it doesn't function like a regular clip, it functions like optimized media.

Thankfully I didn't change the "want" because i solved my problem the old fashioned way... trouble shooting until I found a solution.

For anyone curious, this appears to be an issue related to the DnxHD codec when relinking to footage of a different raster dimension (Relinking to 1080 clips that were made from a 4K DCI source), and I was able to remedy the issue by transcoding my Proxies to DnxHR instead of DnxHD.