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DVR and the Dlog colour glitches

AeroJ

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Hey people...

I am just trying to sort the workflow out for editing footage from the Mini4Pro in DVR, and have run into an interesting problem I can't be alone in experiencing.

This project was recorded in H.265 D-LOG M, 1080P 30 FPS, MP4 container.

If you have a look at the short attached extract from a video I was trying to make, the problem becomes evident almost immediately. Watch what the main camera does in the first 30 secs or so, most prominently just after launch, and then again when we first turn to face the sun, where it becomes highly prominent for about 20 secs before diminishing again, and ultimately disappearing.

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Once the first minute is done, there is 3 mins after that where the footage is consistently fine (same clip!), and then it starts doing it again, for no appreciable reason.

So, for comparison reasons, and to show that there was, theoretically, nothing wrong with the actual footage produced by the drone, I have included the screen recording too, which, confusingly, shows perfect color all the way through. So do the clips from other (DJI) cameras, like the headcam view also shown. And once transferred off the drone, VLC is able to play back the drone clip perfectly, with no color errors, so it can't be the footage itself right ?

Yet as soon as that M4P clip makes into DaVinci Reoslve 18.6.6 we get these horrible colour shift artefacts that look sort of like compression errors, but probably aren't.

I tested it even with no grading applied, and the problem is still present.

Anybody ever seen that before, have an idea what might be going wrong, or just flat-out knows the answer ?!

Thank you.
 
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Since you posted the screen recording showing there isn't an issue, you can rule out the drone's sensor. So that's not the issue.

Which means it's either the card, or the computer/software.

I don't use DaVinci, but if this was happening with one of the titles I used, and not with another, I'd delete and reload the title that wasn't working correctly.

Try that, and/or reach out to DaVinci and see if they have any annswers.
 
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Which means it's either the card, or the computer/software.
And I would probably eliminate the card as well, given that VLC can play it back without the problem. I guess further tests over time will corroborate that or not...

Was hoping it might be a vital tick-box I was missing in DVR Project settings or something. I will try and contact Black Magic, and see if they even answer tech support stuff for freebie version users !

I know it hasn't been up here long, but I kinda can't believe nobody else here has run into that before...
 
Yep, confirmed - I have had time to try it with some other H.265 10-bit clips, and the problem persists.
What fascinates me though is the artefacting seems so utterly random when it turns up - in a 9 minute video I reviewed earlier it only did the error briefly, once, and the rest of it seemed perfect. It sure is a very weird way to show that something isn't supported ! You'd think a message on import would be the way to go right ?!
 
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Are you using the free version? It does not support H.265 10 bit. After I upgraded to Studio, the problem went away.
Does this mean the free version doesn’t support 10 Bit at all, or just using H265 in 10 bit?
And (sorry for my ignorance) must you use H265 in order to get 10bit? Or can you use H.264 in D-Log-10 bit?
 
Does this mean the free version doesn’t support 10 Bit at all, or just using H265 in 10 bit?
And (sorry for my ignorance) must you use H265 in order to get 10bit? Or can you use H.264 in D-Log-10 bit?
It's a good question ! I am just editing what I thought was my first 10-bit 4K video in DVR 18.6, and, given that all my converted footage was working just fine, and taking grading nicely, I had assumed that footage was still 10-bit.
But some investigation prompted by your question shows that actually my imported h.264 conversions are 8-bit !

...which again prompted a bit more investigation, and to mine (and I'm sure yours too) disappointment - it is H.264 that doesn't support 10-bit.
 
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It's a good question ! I am just editing what I thought was my first 10-bit 4K video in DVR 18.6, and, given that all my converted footage was working just fine, and taking grading nicely, I had assumed that footage was still 10-bit.
But some investigation prompted by your question shows that actually my imported h.264 conversions are 8-bit !

...which again prompted a bit more investigation, and to mine (and I'm sure yours too) disappointment - it is H.264 that doesn't support 10-bit.
One of the MANY confusing things to consider in video. I've been a pro Stills guy for 40 years. And am pretty darn proficient in Photoshop & Lightroom. But video and all its components give me a headache.....
 
But video and all its components give me a headache.....
Yep, feelin' that too :) Eventually it's going to annoy me enough to just pay the damned 250 quid....
But for now at least I am still enjoying the gradability and quality I am getting out of 8-bit 4K30, so not a total loss in the meantime...
 
I suppose this poses the corollary question 'Is it worth shooting in 10-bit 265 and doing the conversion down to 8-bit 264 ?'. Is that any easier to grade than h.264 right out of the camera ? And I am not sure it is; perhaps only fractionally. And that is probably mostly because the non 10-bit modes don't usually need that much doing to them if we got the right amount of light into the lens !
 
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