chdkptp - alternative ptp client - page 106 - General Discussion and Assistance

srsa_4c

4217

Re: chdkptp - alternative ptp client

« Reply #1050 on: 29 / February / 2020, 10:50:07 »

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I noticed that the GUI buttons for wheel do not use the wheel related camera side functions, but fixed logical events instead. It was a bit misleading until I peeked into the camera log and found events there I did not send.
I then used the following and it worked.

Code: [Select]

Index: lua/gui.lua
===================================================================
--- lua/gui.lua (revision 829)
+++ lua/gui.lua (working copy)
@@ -366,7 +366,7 @@
    title='wheel l',
    size='45x15',
    action=function(self)
-    gui.execquick('post_levent_to_ui("RotateJogDialLeft",1)')
+    gui.execquick('wheel_left()')
    end,
   },
   iup.fill{
@@ -375,7 +375,7 @@
    title='wheel r',
    size='45x15',
    action=function(self)
-    gui.execquick('post_levent_to_ui("RotateJogDialRight",1)')
+    gui.execquick('wheel_right()')
    end,
   },
   expand="HORIZONTAL",

The downside of using wheel_left and wheel_right is that some ports do not have the right implementation. On the other hand, there are cameras with wheels that use different levents, or even a sequence of levents. I wonder what could be the best way to deal with this issue.

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reyalp

12535

Re: chdkptp - alternative ptp client

« Reply #1051 on: 29 / February / 2020, 18:42:11 »

Quote from: srsa_4c on 29 / February / 2020, 10:50:07

I noticed that the GUI buttons for wheel do not use the wheel related camera side functions, but fixed logical events instead. It was a bit misleading until I peeked into the camera log and found events there I did not send.

Thanks for bringing that up. I switched it to use CHDK wheel functions in r929. I don't remember if I had a specific reason for using levents originally.

Quote

The downside of using wheel_left and wheel_right is that some ports do not have the right implementation.

We can fix them if anyone complains.

IIRC, one difference with the events is they work on some cameras without a jogdial. However, it's mostly equivalent to left / right anyway, and people can still use them from the console if they really want.

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seagullpat

Re: chdkptp - alternative ptp client

« Reply #1052 on: 26 / March / 2020, 06:52:36 »

Hi, just discovered the CHDK project and chdkptp and it's phenomenal, really unlocks what Canon in their infinite wisdom have decided to prevent you doing with your camera!

I've been using the live preview feature to get my camera view into OBS and it's been working great except the live preview is definitely not updating at the refresh rate that the Statistics box states, it seems like it's about half of that. Is there some way to get the live preview window in the app itself to run at a higher refresh rate?

edit: Another thought that I had was that you might be able to achieve better quality and framerate at the expense of latency by streaming recorded video onto the host computer as a video file, in a format like mkv that can be read like a buffer. I've tried simply starting to record video and then starting a Pic&Video download but this doesn't seem to work, potentially because the camera is storing the video being recorded seperately then creating the DCIM file once it finishes.

« Last Edit: 26 / March / 2020, 06:55:58 by seagullpat »

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reyalp

12535

Re: chdkptp - alternative ptp client

« Reply #1053 on: 26 / March / 2020, 13:47:33 »

Quote from: seagullpat on 26 / March / 2020, 06:52:36

I've been using the live preview feature to get my camera view into OBS and it's been working great except the live preview is definitely not updating at the refresh rate that the Statistics box states, it seems like it's about half of that. Is there some way to get the live preview window in the app itself to run at a higher refresh rate?

The way live view works is the client polls the camera periodically for frame data, set the the "target FPS" control, limited to whatever throughput the client can sustain.

This is not synchronized with the actual refresh rate on the camera, and on CHDK ports without vid_get_viewport_live_fb implemented, only every third frame on the camera will actually be seen. What camera are you using?

In low light, some cameras may also reduce the physical refresh rate.

Quote

edit: Another thought that I had was that you might be able to achieve better quality and framerate at the expense of latency by streaming recorded video onto the host computer as a video file, in a format like mkv that can be read like a buffer.

Yeah, streaming video file data would potentially be good, but would require a bunch of reverse engineering that hasn't been done.

Quote

I've tried simply starting to record video and then starting a Pic&Video download but this doesn't seem to work, potentially because the camera is storing the video being recorded seperately then creating the DCIM file once it finishes.

This definitely won't work. While your computer may present the camera as something like a file system, it actually communicates using PTP, which is much more limited.

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seagullpat

Re: chdkptp - alternative ptp client

« Reply #1054 on: 26 / March / 2020, 16:05:09 »

Thanks very much for responding, my aim at the moment is basically just to get up to maybe 20-30fps to have vaguely smooth video as an alternative to a webcam given that I don't really want to order one atm. The framerate is still noticeably low (I'd judge ~10fps) when the slider is set to 30fps and the reported framerate is at about 20fps, so should I have a go at modifying the PTP live view scripts on the camera itself to change this behaviour?

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reyalp

12535

Re: chdkptp - alternative ptp client

« Reply #1055 on: 26 / March / 2020, 22:28:53 »

Quote from: seagullpat on 26 / March / 2020, 16:05:09

The framerate is still noticeably low (I'd judge ~10fps) when the slider is set to 30fps and the reported framerate is at about 20fps, so should I have a go at modifying the PTP live view scripts on the camera itself to change this behaviour?

There's not much to change. If you post which camera you are using, I can check if vid_get_viewport_live_fb is implemented. If it's not, it can probably be added.

Also, what OS and version of chdkptp are you using?

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seagullpat

Re: chdkptp - alternative ptp client

« Reply #1056 on: 27 / March / 2020, 10:09:16 »

Using a G15 PowerShot with firmware 100e, with CHDK 1.4.1 r5414, and I'm on Windows 10

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reyalp

12535

Re: chdkptp - alternative ptp client

« Reply #1057 on: 27 / March / 2020, 13:35:25 »

Quote from: seagullpat on 27 / March / 2020, 10:09:16

Using a G15 PowerShot with firmware 100e, with CHDK 1.4.1 r5414, and I'm on Windows 10

Thanks. Looks like vid_get_viewport_live_fb is not correctly implemented on this port, so you are only seeing every 3rd frame at most, likely resulting in 10 FPS as you suspected. I should be able to post a test build in the next few days, unless someone beats me to it.

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reyalp

12535

Re: chdkptp - alternative ptp client

« Reply #1058 on: 28 / March / 2020, 23:37:17 »

G15 test build posted in the porting thread: https://chdk.setepontos.com/index.php?topic=9257.msg143050#msg143050

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