High bitrate simulation

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BrydeSorensen

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High bitrate simulation

PostFri Jul 12, 2024 11:07 am

What would be the best image to print on paper, for the purpose of simulating a high detail scene?
Does color matter? I'm thinking a big paper that is just alternating black/white dots, as precise as the printer can do.
Is there anything like this available?
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Jeffrey D Mathias

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Re: High bitrate simulation

PostFri Jul 12, 2024 1:03 pm

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Jim Simon

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Re: High bitrate simulation

PostFri Jul 12, 2024 8:32 pm

I tend to use flowing water or leaves blowing in the wind to push the encoder.
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BrydeSorensen

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Re: High bitrate simulation

PostFri Jul 12, 2024 9:13 pm

That's what i do now, but it would be better to have something more controllable.
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John Brawley

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Re: High bitrate simulation

PostFri Jul 12, 2024 9:39 pm

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Jim Simon

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Re: High bitrate simulation

PostSat Jul 13, 2024 2:20 pm

BrydeSorensen wrote:That's what i do now, but it would be better to have something more controllable.
Well, it's that uncontrolable "chaos" which makes it a good test. ;)

I don't think any static image would be as good.
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roger.magnusson

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Re: High bitrate simulation

PostSat Jul 13, 2024 2:58 pm

That depends on what the purpose of the test is. If it's to push Blackmagic Raw to the limit it doesn't matter if it's a moving image or not as each BRAW frame is unrelated to the next.

If it's for testing long GOP encoding motion matters as images are computed between keyframes.
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BrydeSorensen

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Re: High bitrate simulation

PostSat Jul 13, 2024 5:08 pm

It's just for static testing. I need something more consistent than pointing it at threes and that i know pushes it to the limit consistently.

I could make my own sheet, just with alternating black/white pixels, but i'm not sure if that's the best.
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John Brawley

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Re: High bitrate simulation

PostSat Jul 13, 2024 8:58 pm

BRAW isn’t like other codecs.

It’s based on what’s sharp and what’s not.

A wide shot of fine detail and a moving wide shot, but of fine detail will use the same amount of data.

A shot that’s out of focus of fine detail will use a lot less data. It doesn’t matter if it’s moving or not.

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Uli Plank

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Re: High bitrate simulation

PostSun Jul 14, 2024 5:04 am

There's a nice story about the early days of the Red One. Someone used it in the Southern U.S. (IIRC in Georgia), where you have those trees with a lot of plants on them hanging down like curtains.
That DoP used a WA lens and had deep focus in daylight, and it actually crashed the camera's OS, when it already worked very well everywhere else. They called it the 'evil tree' and somebody even jokingly suggested that Red should buy it, dig it out and plant it their headquarters for testing the codec.
Just like for BRAW, that's all you need. High-end cameras normally don't use GOP codecs, other than for proxies.
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BrydeSorensen

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Re: High bitrate simulation

PostMon Jul 15, 2024 9:09 pm

What would be the best image to print on paper, for the purpose of simulating a high detail scene (high bitrate)?
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John Brawley

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Re: High bitrate simulation

PostMon Jul 15, 2024 9:39 pm

This.

Buy this. It’s one of the lower cost test charts you can buy. It’s designed to do exactly what you’re asking.

https://www.imatest.com/product/imatest ... art-color/

JB
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