I am new to KDENLive. Very nice application by the way.

Trying to apply a color correction LUT to my 10-bit DLog-M H.265 UHD videos from a DJI drone.

In particular, I'm trying to apply DJI's officieal DLog-M-to-REC709 LUT.

When I preview a clip or render with a LUT applied, the output pane (or laboriously rendered stream) is blank/null.
When I apply another LUT, say the GroundControl DLog LUT, it is able to preview and render, although it's a bad-looking lut for this application.

I was able to successfully apply this very DJI LUT on this very clip using Lightworks. Does anyone have any thoughts about why this LUT is causing KDenLive (or one of its dependencies) to choke on this LUT?

FWIW: I'm running Ubuntu 18.04 with the Plasma destkop. I installed KDen from the standard Ubuntu repo. The computer has Intel embedded graphics (i5-6300U). Kdenlive 17.12.3, MLT 6.6.0

Try with the AppImage 18.08.2 (contains MLT 6.10).
I saw some LUT issues with Sony.

I downloaded and ran the appimage v 18.08.2. New to appimages. Very nice.

What's different now is that selecting the LUT does result in null output, rather, it results in identical output.

Running the Kdenlive binary from the command line, the console spit out these errors when I selected the LUT,

[filt @ 0x7f5258007be0] 3D LUT is empty
[filter avfilter.lut3d] Cannot init filter: Invalid data found when processing input

Three more times when I switched between the three interpolation modes, and back to Nearest.

[filt @ 0x7f525981cc40] 3D LUT is empty
[filter avfilter.lut3d] Cannot init filter: Invalid data found when processing input
[filt @ 0x7f5259816280] 3D LUT is empty
[filter avfilter.lut3d] Cannot init filter: Invalid data found when processing input
[filt @ 0x7f5259813e00] 3D LUT is empty
[filter avfilter.lut3d] Cannot init filter: Invalid data found when processing input

The groundcontrol dlog LUT does generate any error messages, and previewed images definitely are being color-corrected.

I wonder if this has anything to do with it being a 10-bit encoding.

This could be. I think all is 8bit. Can you try with 8 bit footage?

Unfortunately not. The DJI Mavic 2 Pro's DLog-M profile is only available in 10 bit. Only Rec. 709 is 8-bit (for some reason), and there's no way to shoot directly in 10-bit Rec. 709. I'm guessing this simply a MLT thing. Maybe I should ask this question in the MLT forum?

Yes it's MLT related. Maybe you get a clear answer from MLT. If so please post back in here.

Hi! I have the same issue.
I wan't to use the official LUT from DJI and didn't work on kdenlive.
@karlfife can you do it?

BTW i love kdenlive!