mechanicalEYE

Basically the timer kicks in whenever 8K or 4K HQ is enabled in the menus and there is a live-view feed on the LCD or EVF (even if it is hidden behind a menu overlay).
That's probably just how they implemented the cripple clock in firmware.
When the screen is off it probably disables the mechanism they are using to calculate run times... either by error, or on purpose to satisfy Atomos.
That the scorching hot ambient temps and black alloy casing absorbing so much external heat don't impact the timer, has to tell you something!

So I just tried recording externally with R5 screen off.  (Using the R5 battery, with no cards in camera)
This was indoors in a cool room.
I started the recording on the Ninja at 09:14
I stopped the recording at 10:15
Recorded 4K HQ continuously for 1hr and 1 minute with no overheat warning on the R5 screen, and no overheat shutdown through the duration of that hour.
I immediately shut camera down, then unplugged the HDMI cable, and removed battery.
I then reinserted the battery and put in the CFexpress card, turned camera on and overheat counter said I could record 15 minutes.
 

Meanwhile, Andrew and many others are testing the camera to see what the real boundaries are.
Heard of Magic Lantern? Lots of cameras capable of much more than what Canon chose to give you.

No it doesn't.
It reads the temperature status from the API.
This is an entirely different thing to the temperature as a value, which is being read from the EXIF in the exposed image.
The temperature status is the camera's own interpretation of its internal temperature with relation to what restrictions it will apply to camera operations. 
When this is "normal" everything is, well, "normal" and the camera is reporting that there is no cause for alarm or any restrictions.
It then goes through an escalation process of different inhibitors including, amongst other things, restricting fps, reducing image quality and prohibiting recording.
There is no interpretation other than by Canon of that status as it is being reported through the API.
The temperature in the exif is being used as a comparative indicator of what the actual internal temperature (or one of them) is and provides a visual reference (as it is pointed at the screen of the app) to cross reference which inhibitors are activated and deactivated as time progresses.
The rate at which the camera is commanded to take an image is variable so I'd probably stay tuned for a few more tests at different rates.

I'm not the guy to take on opening up a camera but today I'm outside in 102 degrees recording 4K HQ externally for 45 minutes straight with no overheat warning. ( Camera screen off ) and the camera was very HOT to the touch, much hotter than I've experienced at any point during my test and I have shot in 97 degrees where the camera shut down at 42 minutes. Only difference was that the screen was on before, and here it was off. The camera felt much hotter today though. It was hot enough that I was concerned.
I was pretty shocked that it didn't overheat, and even more shocked it didn't show the warning. I brought the camera indoors while it was still recording, grabbed my CFexpress card and inserted while camera was still recording. When you open the card door, the camera temporarily shuts down.
When I closed the door the camera went right back to recording through the Ninja V. I shut the Ninja V down, and my 4K HQ time allowance was 20 minutes.
I shut the camera down again, and back on it, it still read 20 minutes. About 5 minutes later the camera was showing 25 minutes, this is while the camera still felt very warm to the touch. 

It seems not the card or battery but driving the screen to affect more the heat or the timer....
Would be nice to see 8k and 4k 120 if with external screen will get 30min and also no build up of heat while not recording like menu, framing, etc..... it would be already a better proposition

I'll try as well.
Yes, turning the screen and evf off increases recording time. got an hour straight today without overheat warning and I stopped it at 1hr could have gotten more I think, but before with screen on could only get 42 minutes before it shut down.

Without pressure on their courtyard nothing will happen.

So I just tried recording externally with R5 screen off.  (Using the R5 battery, with no cards in camera)
This was indoors in a cool room.
I started the recording on the Ninja at 09:14
I stopped the recording at 10:15
Recorded 4K HQ continuously for 1hr and 1 minute with no overheat warning on the R5 screen, and no overheat shutdown through the duration of that hour.
I immediately shut camera down, then unplugged the HDMI cable, and removed battery.
I then reinserted the battery and put in the CFexpress card, turned camera on and overheat counter said I could record 15 minutes.
 

I think they'd make more money just putting good stuff out, to be honest. No games.
If the EOS R5 is capable of longer record times in 4K HQ and 8K, just give them us.
We paid for it!
We get to decide how we use it.
Especially as it was marketed for pro video use.

There is the possibility they will piss off their cinema customers. But I would think their cinema customers would be first in line to buy this camera if it did 4KHQ with a much shorter “recovery” time, or no recover time at all.
I think the 4KHQ mode should be unlimited. It’s pretty blatantly obvious it is because magically plugging in a HDMI cable makes it possible.

I guess in a world where the right thing is done, we wouldn't be experimenting with cooking the internals of our R5's in the first place. 🤣 🤣

Hope you're not... ;- )

Do we need anything new to already know it? ; )
It's embarrassing to say the least...
1992. A further VP of Sony Europe told me to count on it along my career because these practices are part of this industry.
2020. A couple of new novelties today though: digital revolution and internet.

Andrew's point is still valid though : )
Thanks you two @Andrew Reid @BTM_Pix for your guts and service to filmmaking, keep going your focus and hard work :- )

The thing is, if they DO fix this and own up it will be a fantastic camera and many many people will instantly forgive them.

A good reaction on Twitter:

I agree with Quinn about it being a bad look.
They need to at the very least come clean, answer, own up and apologise.
Then fix it.

Yesterday Amazon dropped off the last piece I needed for my Ninja V to try my own R5 / Ninja V test today.
Yesterday - First attempt: Camera setup with the overheat control setting on, screen on, 4K HQ 30.
No card in camera. Canon LP-E6NH battery in camera
Camera was sitting in direct sun light at 97°F
Continuous recording started and camera overheat warning came on at around 37 minutes or so, it shutdown at around 42 minutes, which aligns exactly with what John Gress stated in his video that Trek of Joy posted here earlier.
When camera shut off, I immediately turned it back on and the camera still showed the 8K, 4K 120, and HQ options available. Makes me think it’s more of the firmware parameters set by Canon here. Camera was hot to the touch.
time between test: 45 minutes to an hour
Yesterday - Second attempt: Kept the settings at 4K HQ 30, screen on, but turned off the overheat control setting.
No card in camera. Canon LP-E6NH battery in camera.
Camera was sitting in shaded garage at 97°F
Camera overheat warning appeared at 37 minutes, shutdown at 42 minutes. Camera was warm to the touch.
Today - Third attempt: No prior operation before test... Camera setup 4K HQ 24p, overheat control setting off, screen on.
Camera indoors in my office, with A/C on set at 72°F
No card in camera. Canon LP-E6NH battery in camera.
Camera overheat warning came on same time at and lasted to about 42 minutes. Camera was warm to the touch.
The times I am seeing align with Geralds test, except the overheat control setting didn't seem to change much on or off, and I had no cards in camera for all recordings. 
Haven't tried with camera screen off, but I don't believe the Cfexpress cards are a notable factor in overheating, as believed by the ( nolifedigital ) guy.
 
 

Yesterday Amazon dropped off the last piece I needed for my Ninja V to try my own R5 / Ninja V test today.
Yesterday - First attempt: Camera setup with the overheat control setting on, screen on, 4K HQ 30.
No card in camera. Canon LP-E6NH battery in camera
Camera was sitting in direct sun light at 97°F
Continuous recording started and camera overheat warning came on at around 37 minutes or so, it shutdown at around 42 minutes, which aligns exactly with what John Gress stated in his video that Trek of Joy posted here earlier.
When camera shut off, I immediately turned it back on and the camera still showed the 8K, 4K 120, and HQ options available. Makes me think it’s more of the firmware parameters set by Canon here. Camera was hot to the touch.
time between test: 45 minutes to an hour
Yesterday - Second attempt: Kept the settings at 4K HQ 30, screen on, but turned off the overheat control setting.
No card in camera. Canon LP-E6NH battery in camera.
Camera was sitting in shaded garage at 97°F
Camera overheat warning appeared at 37 minutes, shutdown at 42 minutes. Camera was warm to the touch.
Today - Third attempt: No prior operation before test... Camera setup 4K HQ 24p, overheat control setting off, screen on.
Camera indoors in my office, with A/C on set at 72°F
No card in camera. Canon LP-E6NH battery in camera.
Camera overheat warning came on same time at and lasted to about 42 minutes. Camera was warm to the touch.
The times I am seeing align with Geralds test, except the overheat control setting didn't seem to change much on or off, and I had no cards in camera for all recordings. 
Haven't tried with camera screen off, but I don't believe the Cfexpress cards are a notable factor in overheating, as believed by the ( nolifedigital ) guy.
 
 

Yesterday Amazon dropped off the last piece I needed for my Ninja V to try my own R5 / Ninja V test today.
Yesterday - First attempt: Camera setup with the overheat control setting on, screen on, 4K HQ 30.
No card in camera. Canon LP-E6NH battery in camera
Camera was sitting in direct sun light at 97°F
Continuous recording started and camera overheat warning came on at around 37 minutes or so, it shutdown at around 42 minutes, which aligns exactly with what John Gress stated in his video that Trek of Joy posted here earlier.
When camera shut off, I immediately turned it back on and the camera still showed the 8K, 4K 120, and HQ options available. Makes me think it’s more of the firmware parameters set by Canon here. Camera was hot to the touch.
time between test: 45 minutes to an hour
Yesterday - Second attempt: Kept the settings at 4K HQ 30, screen on, but turned off the overheat control setting.
No card in camera. Canon LP-E6NH battery in camera.
Camera was sitting in shaded garage at 97°F
Camera overheat warning appeared at 37 minutes, shutdown at 42 minutes. Camera was warm to the touch.
Today - Third attempt: No prior operation before test... Camera setup 4K HQ 24p, overheat control setting off, screen on.
Camera indoors in my office, with A/C on set at 72°F
No card in camera. Canon LP-E6NH battery in camera.
Camera overheat warning came on same time at and lasted to about 42 minutes. Camera was warm to the touch.
The times I am seeing align with Geralds test, except the overheat control setting didn't seem to change much on or off, and I had no cards in camera for all recordings. 
Haven't tried with camera screen off, but I don't believe the Cfexpress cards are a notable factor in overheating, as believed by the ( nolifedigital ) guy.
 
 

Do you have anything constructive to offer or just more of this? Getting a bit bored of it now.

Get to fuck with lifting stuff off Reddit so you can hide your spam in it.

Nope – that is 4K HQ being output to Ninja V for sure
 
 

There is only HQ up to 30, 60 is lineskipped/binned, 120 is internal only the same for 8k at the moment.

From the test that I saw external "unlimited" without card is HQ but another test would not be bad..

No when you pull the card and record externally it seems to allow HQ recording for sure, but it also allows longer record times in HQ modes without overheating.
I'd be really interested in hearing the outcome of your test on this.
Hilarious!