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crop_rec and derived builds / Re: Bilal's crop_rec_4k experiments for 650D / 700D (T4i / T5i)
« on: January 18, 2023, 09:34:42 PM »@Icaab
"Falling speed"
Your SD card seems fine. as Walter said the first benchmark isn't related to what you are facing.
More likely your scenes are complex and you probably always use 14-bit lossless which requires fast write speed in some scenes in UHD 1x3 mode (could be more than 80 MB/s; more than the camera can handle).
You can check how much does RAW video recording needs in specific scene by higlighting "RAW video" in "Movie" tab, and check ML bottom bar.
If the required write speed is too high, you either need to enable "aewb" hack (which could gain 5-7 MB/s write speed) or use lower bit-depth from "Crop mode" submenu, like 12-bit.
"Noisy stripes"
I could see some vertical stripes after pushing contrast and some other settings in "M30-0751.mlv" clip, and it's probably there in "M30-0803.mlv" clip too (barely visible).
I think you will need to use dark frame to get rid of these vertical stripes, have you ever used dark frame before?
You can do that in MLVApp.
for "3 v M15-1653.mlv" Dual-ISO clip, it seems to me these are other type of vertical stripes which can come from Timer A (or B?) at specific values. The main cause for this is by using FPS override in some "Crop mode" presets like UHD 1x3. I am assuming you have used FPS override with UHD 1x3 preset, right?
To make sure, record a clip (like a cloudy sky, the scene must show vertical stripes as in Dual ISO shot), fiirst time using the same settings (5 FPS, UHD 1x3) and another time without FPS override, then upload them somewhere.
Yeah, I know what you wrote. Unfortunately, there are probably failures in the camera and at one point it can not properly shoot a few seconds, as if not changing the bit depth(in the scene only my room).And so the fruitless shooting goes for five minutes, and then the problem disappears by itself and I can shoot continuously even in 14-bit depth.
Yes, I know about the darkframe, but what’s the point when I have a bright picture, shooting was with 200 iso and the exposure settings were not properly changed in mlvapp? I’ll try it next time, but I’ve never seen such a problem with vivid frames
Bilal, what Walter Schulz meant when he said
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Redo your test without lossless compression to avoid side effects. Esp. high/overexposure will reduce compression efficiency (and worse).
How do I do that?