#Capturing from Camera HDMI to Elgato HD60X

1 messages · Page 1 of 1 (latest)

ember coral
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I have a question about Camera HDMI output 📸

yesterday, I tried recording on PC to get highest quality with capture card. which helped a lot, but I found something that I can't understand:

When the Camera is connected with HDMI, I can zoom in picture up to 200% from the camera itself, doing this, I still had VERY SHARP image in OBS and recording as well.

But when I record with no zoom, even in prores, after recording, I zoom 100% and the quality isn't the same as that real time in camera digital zoom
Why? Is there something missing?

I attached 2 pictures to show you the difference

In_camera.png After_recording.png
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First pic is while recording with in camera zoom, (sharper)
Second one is after recording zoom (Not sharp)

I recorded Prores lossless quality though

real blaze
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or do you know what bitrate prores lossless is recording at compared to in camera

ember coral
# real blaze what camera is this

It's Nikon D7200
In camera recording is 4:2:0 23Mb/s @1080p
HDMI: 4:2:2 Uncompressed
but these are both captured on PC
the only difference, one is not zoomed digitally
the other one includes in camera zoom while recording

And though I recorded Prores it seems digital zoom in camera while recording to be shaprer

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I talked to Nikon support, and they said this is the reason:
"when you digitally zoom in the camera, the processor only focuses on the part that you zoomed in, resulting in higher picture quality in compare to when it's going to process the whole picture"
that's why it looks like shaper and more clear in compare to post zoom.

real blaze
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as far as I'm aware the D7200 shipped with a kit 16-140mm?

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Oh wait I see what the question is

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since D7200 has 1080p60 max for its hdmi output, you're limited by how many pixels you have

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when you zoom using the lens, all 1920x1080 pixels are capturing a tighter area

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but if you're zooming post recording, you're cutting out a bunch of those pixels

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so where a 1080p closeup shot would still be 1080p

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you could cut it down to like 480p to get the same fov

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and 480p is a lot less pixels than 1080p, which in turns shows much less detail

ember coral
ember coral
ember coral
real blaze
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I'm not sure if the D7200 supports downsampling for digital zoom

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since it's still a 24mp sensor which is much higher than 1080p

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it's very possible it does though

ember coral
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as I showed that finger test

real blaze
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then that's probably the difference haha

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being able to downsample from the sensor

ember coral
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yeah I mean, when I don't digital zoom, and do it later, quality is low

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but when I do in camera, it's high

real blaze
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well once it's later you don't have the entire sensor to read from

ember coral
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I don't have macro lens

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it helps to get high quality

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even from far

ember coral
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I thought if I capture prores uncompressed I will get same quality in post zoom

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but no

real blaze
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haha

ember coral
real blaze
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sth like that yea

ember coral
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Yeah I'll probably try that

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if it has good quality

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Macro lens is too expensive

real blaze
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you could also just go extension tubes

ember coral
real blaze
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uh

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it basically is what it sounds like

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an extension tube that goes between lens and body

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no glass, just an empty space

ember coral
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what does it do

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overall

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how it helps I mean

real blaze
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moves the lens further from the sensor which increases magnification but keeps minimum focusing distance

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basically it's a macro thing as well

ember coral
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oh I see

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that's cool

real blaze
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worth a shot as well

ember coral
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yes, I should check YT Tests first

real blaze
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yep

ember coral
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for 60, it crops the sensor

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which I'm not a fan of

real blaze
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O

ember coral
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60FPS = 1.3X sensor crop

real blaze
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I don't have much experience with Nikon cameras since I'm a Canon shooter but dang

ember coral
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yeah

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It doesn't looks bad though, since scale works good, but yeah

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you lose 0.3x of the picture

real blaze
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30 frames is mostly fine imo

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but yea I know what it looks like

ember coral
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Yeah the same, I record 24 FPS usually, but if I need slow-mo then 60

real blaze
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my travel camera is an M200 which has a 1.6x crop in 4k which is hot garbage

ember coral
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Oh that's a lot

real blaze
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but I don't do much video too so still doesn't affect me haha

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yea

ember coral
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Yeah nice haha

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I bought this camera for photography long ago

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didn't know I become a YouTuber and use if for video

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but it's still good

real blaze
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it's solid

ember coral
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but anyway with the help of Capture card I can do many things,
for example recording with 1/8 shutter speed

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normally not possible in these camreas

real blaze
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wait

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1/8?

ember coral
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yeah for doing some special mood

real blaze
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so you're only getting 8 different frames a second

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Oh

ember coral
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I've seen many music videos doing these stuff to make an special effect

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and low shutter speed is really cool

real blaze
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yea for the motion blur

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ik

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yea my M200 allows for 1/8 but that's as slow as it'll go

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which makes sense

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makes for that hazy effect

ember coral
ember coral
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and photomode Live view AR is higher in this camera

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video is 16:9

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but photo maybe 16:12

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and this way, I get more room

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to edit later

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but that way it's maxed to 30FPS

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Overall what I found it's about processor

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if these cameras had good one, they could give us much better quality video

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with the same sensor

real blaze
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oh yea for sure

ember coral
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as close as to photo maybe

real blaze
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tho I'm willing to bet for my camera it's an artificial limitation

ember coral
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What model do you have?

real blaze
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I don't do video much but I use my m200 for it

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canon m200

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Lens is whatever I have on hand, but kit lens is actually one of my fav because of it's focal length and size. 24-70mm equivalent and is like 10cm in length is pretty good imo