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What is the difference between -raw and -dng in CHDK PTP???

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Offline blenderbach

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Re: What is the difference between -raw and -dng in CHDK PTP???
« Reply #20 on: 07 / June / 2023, 23:12:05 »
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So, Reyalp. Thank you.

It works perfectly now.
In video mode, the lvdumpimg is a full 720x528 resolution, and looks better than the stock video resolution.


In the other modes (which are all photo modes), the image I get back is 720x240, which looks like garbage.

When I scale it to 720x540, it looks still like garbage. :P


You mentioned it shouldn't look better than the stock mjpeg, but it does. At least when I enter the Video Mode.
But why does it look like junk in photo mode? Does it, reduce the live view resolution to allow extra processing power to the photo modes? But still, thanks! The new 720x528 mode looks incredible! 👍
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Offline reyalp

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Re: What is the difference between -raw and -dng in CHDK PTP???
« Reply #21 on: 07 / June / 2023, 23:56:23 »
Quote from: blenderbach on 07 / June / 2023, 23:12:05
In video mode, the lvdumpimg is a full 720x528 resolution, and looks better than the stock video resolution.
Thanks for confirming. I've checked that change in, it will appear in trunk autobuild 6249 and later.

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In the other modes (which are all photo modes), the image I get back is 720x240, which looks like garbage.

When I scale it to 720x540, it looks still like garbage. :P
Well, it only has 240 lines of vertical resolution, which really isn't much...

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You mentioned it shouldn't look better than the stock mjpeg, but it does. At least when I enter the Video Mode.
I meant the scaled 720x240 version, and said you *shouldn't be surprised* if it looked worse.

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But why does it look like junk in photo mode? Does it, reduce the live view resolution to allow extra processing power to the photo modes? But still, thanks! The new 720x528 mode looks incredible! 👍
My guess is that the physical camera display is only 240 (the specs in the Canon S3 manual say "approx 115,000 pixels" which doesn't match any obvious way of counting the buffer sizes, but would be even less than 720x240), and the 528 buffer in video mode somehow allows video to be handled more efficiently, while being downscaled for the display. But that's just a guess.
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Offline blenderbach

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Re: What is the difference between -raw and -dng in CHDK PTP???
« Reply #22 on: 08 / June / 2023, 00:35:09 »
Quote from: reyalp
Thanks for confirming. I've checked that change in, it will appear in trunk autobuild 6249 and later.
You're welcome! :)
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Well, it only has 240 lines of vertical resolution, which really isn't much...
I meant the scaled 720x240 version, and said you *shouldn't be surprised* if it looked worse.
My guess is that the physical camera display is only 240 (the specs in the Canon S3 manual say "approx 115,000 pixels" which doesn't match any obvious way of counting the buffer sizes, but would be even less than 720x240), and the 528 buffer in video mode somehow allows video to be handled more efficiently, while being downscaled for the display. But that's just a guess.
Oh. Alrighty. Thanks for the information and insight! You are seriously a genius. ✌

But I was wondering, there is no other live view buffer that goes higher than 720x528, right?

P.S. I should also mention, it seems the same issue might be on my Canon SX40HS where it doesn't work right in video mode, but I'll have to first check again. :P

P.P.S. The higher resolution video is splendid! https://cdn.discordapp.com/attachments/1053116980451876986/1116213723414142986/720x528CanonS3ISFINALVID0001-0500.mp4
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Offline reyalp

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Re: What is the difference between -raw and -dng in CHDK PTP???
« Reply #23 on: 08 / June / 2023, 01:26:38 »
Quote from: blenderbach on 08 / June / 2023, 00:35:09
But I was wondering, there is no other live view buffer that goes higher than 720x528, right?
I'm not aware of any for cameras of the same generation as s3.
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P.S. I should also mention, it seems the same issue might be on my Canon SX40HS where it doesn't work right in video mode, but I'll have to first check again. :P
Looking at the code, it seems like it has a pretty complete live view implementation, so it shouldn't have the issue s3 originally had. There could be other bugs though.

I would not expect a not expect SX40 to have the 528 viewport height in video, my impression was that was only present on early digic II and III cams. That said, Canon has done a lot of variations over the years.
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Offline blenderbach

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Re: What is the difference between -raw and -dng in CHDK PTP???
« Reply #24 on: 08 / June / 2023, 01:54:21 »
Alright. Thanks anyway, for the information and added support! 👊8)👍
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