5D3 - How do we get continuous slow-mo?

[moodlover]

5D3, Lexar 64GB 1000x, 1280x720 60FPS canon setting, 1/100 shutter speed, ISO 1600
Global draw OFF, FPS override 50.000

I cant even get 1920x648 (16:9) for longer than 9 seconds. The bottom of the screen says in yellow:
"103.8mb/s at 50.000p. Expect 530-552 frames at 79.5MB/s"

If I change aspect ratio to 2.35:1, it says Resolution: 1920x490 and the text at the bottom says in green:
"78.4mb/s at 50.000p. Continuous recording OK."

Is this normal? I need my slow-mo footage to fit eventually become 1920x818 so how does this all work? Do I literally just stretch the footage vertically? Also, is it okay to use one of the "yellow-zone" record resolutions?

[DeafEyeJedi]

You need to get a faster CF card. Try getting 1066x.

Card warm up helps a little too.

[jonathan.grevsen]

You can use Resolve to stretch the footage and export in slowmotion

[beauchampy]

The longest I can get at 16:9 is 16 seconds.

5D3 on 1.1.3
Using original Raw Rec module (not MLV)
Global Draw off
Lexar 1066x 64gb, but I also get the same on my lexar 1000x 32gb.

9 seconds is about right for the mlv module. I haven't been able to get higher at 16:9.

Note: you get longer slo mo record times on 1.1.3 because something to do with live view being double buffered on 1.2.3. Theres a thread about it on here somewhere.

[goldenchild9to5]

@beauchampy I got 25 sec @ 48fps using a Lexar 1066x 64GB card in Raw mode.  MLV 16 sec.. with Global Draw off, With Global Draw on I still get around 16 sec with Raw, and 13 sec.. with MLV.

[Kharak]

Try dual slot recording for some extra MB/s