Blackmagic Forum

Hi guys

I have a 4K 25 fps mp4 stuck into my timeline in the edit tab, around 5000 something frames. I then go to Fusion tab and add a loader and add EXR file sequence, some files of the sequence is missing, but I dont mind that. I add gamut node to my loader to make the linear EXR > sRGB then merge that with the media in and stick it into media out.

I go back to my edit tab, trim off the 1st 300 frames and set that as my mark in. I trim off some frame off the end and set that as my mark out.

In the render tab I do a H.264 master mp4 at 25 fpd and render.

I get an error:
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Render Jo1 1 failed as the current clip could not be processed.
The Fusion composition on the current frame or clip could not be processed successfully.
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Anobody have any hints?

I'm sure with 16 this was not an issue and it would simply skip missing frames or come up with something like a red frame complaining about "media". I'm getting none of those with 17

i7 3930K
64GB Ram
RTX 2070 Super (Primary)
GTX 1080 Ti (Secondary)
Windows 10 Pro version 20H2 (build 19042.685)
NVidia Studio Driver 460.89

I've now tried with a saver directly in the Fusion tab. It does seem its not liking the missing frames...

Can't it just export a blank frame instead of stopping with an error?

Here's the same error when render timeline with some fusion Fusion objects, no error in Fusion tab, playback is smooth, but when I'm rendering DR timeline, it give me same error on same places.
Here I'm on 17b6 on Mac.

can we get a switch we can flip to not error on missing frames or to output blank frames instead for the missing frames?

For now the only solution I can think of is manually creating blank cheated frames for all my missing frames, so the sequence is in tact....... seems like a lot of unnecessary manual labour

Did you try to uncheck the option 'Stop Render when a frame or clip cannot be processed' ?

Another one that I find usually works is to check the "Network Optimization" box in the render dialog. NO idea why this works, (I don't render on a network).

The Network Optimization option changes the encoding in such a way that it's delivery over a network, such as DLNA to your TV, works better. It's unrelated to using a network with your edit system.

Jim Simon wrote:The Network Optimization option changes the encoding in such a way that it's delivery over a network, such as DLNA to your TV, works better. It's unrelated to using a network with your edit system.

Thanks Jim, that makes sense.

PierreS wrote:Did you try to uncheck the option 'Stop Render when a frame or clip cannot be processed' ?

that doesnt really work because it skips that frame ENTIRELY and just makes it black, instead of just skipping the layer of the fusion missing frames

Morné Erasmus wrote:add a loader and add EXR file sequence, some files of the sequence is missing, but I dont mind that.

This part puzzles me. Your current situation is analogous to having a movie file that's so badly corrupted that some frames cannot be decoded.

Why wouldn't you fix the "movie". Create a black EXR image, or transparent, or something that will be acceptable and duplicate it into your sequence -- numbering it appropriately -- to fill in the sequence gaps. Voila, you now have a "movie" where Resolve can decode every frame and the frames look as you want.

As far as I can tell, the Loader node in Resolve's Fusion is meant for a very specific purpose -- it's won't read movies, for example -- and what you're doing isn't even technically similar to that purpose.

Well we have a long continuous drone footage clip which we tracked and cam matched, so we can add CG elements to it.

For some parts of the footage, a time warp was applied (we're keeping only every 50th frame for some bits and for other bits every 100th frame) (This part is being done in Premiere by another artist)

To not render out ALL the frames from our DCC, we're only rendering out the bits we need
so for 1000 frames we only need every 50th frame for example, then the next 352 frames we need every frame then again the next 1000 frames every 100th frame etc etc.

So then we render out an EXR CG "sequence", but as explained above the sequence is broken as only some bits are needed.

In Resolve we load the entire orignal drone clip and add the EXR sequence in Fusion on top of the drone clip. To create blank exr frames for the missing bits is doable, but a major pain and time consuming since the CG bits have a beauty pass, but also around 30 other render elements and masks. So in essense we have 30 exr sequences all with the same missing frames. To fill in the gaps for those missing frames is time consuming.

What I'm saying is, would be nice to just have a switch to treat missing frames as a transparent image without affecting other layers/images that are not missing in that specific frame

My output would then be loaded back into Premiere and the artist there will just replace the drone footage with my already comped footage and they will carry on adding other mograph elements from there.

I might just output the missing frames from my DCC and render blank smaller frames for all render elements to fill in the gaps for the missing frames as seems this is the only option for now

I don't see that you've tried changing the option in the Loader's Inspector on how to handle missing frames. But maybe you didn't mention that explicitly, or maybe I missed it. You have several choices there. It's possible that in v17 there's a bug and it doesn't implement those choices correctly, of course.

If I understand you, you have some number of segments that you are editing into your timeline. Each segment may be "sped up" in the sense of only using every Nth frame. But the segments all have the same file name prefix, so appear to be one long sequence. Is that right?

Do you have any utility programs or Python skills to rename/renumber your sequences to something more meaningful and contiguous? (Like Drone_03_02_001.exr, Drone_03_02_002.exr, ..., Drone_03_03_001.exr, etc.) In that case it should work fine, since there wouldn't be gaps at all.

I could even imagine a workaround where you grab Blender, make an empty scene that is the same dimensions as your existing EXR and has as many frames as your maximum frame number, and render out those frames -- should be fairly quick -- to ANOTHER folder by the same name and numbering scheme as your existing. Then copy your existing from your very secure folder onto that other folder, replacing the blank frames where you actually have frames. Again, you'll have a huge but contiguous EXR that behaves.

All I can think of.

wfolta wrote:I don't see that you've tried changing the option in the Loader's Inspector on how to handle missing frame...

Ah, actually I missed that part in the loader! I've now just set it to output a color (an alpha) and now all is fine as it should be, thanks