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martin.s
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martin.s
Posted 7 Years Ago
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Group: Forum Members
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Thanks for the info Keith, so it is at least theoretically possible to achieve 60fps on usb2 as well as usb3. I have the logitech c920 as well as the c922. The c920 works well and achieves its max fps of 30fps. So for me so far there is no advantage with the c922 over the c920 both run at 30fps.
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animagic
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animagic
Posted 7 Years Ago
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Last Active: 9 hours ago
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I assume there must be in-camera compression because I do get 1080 at 30 fps for the camera itself. So the actual required bit rate will be lower. I googled for c920 bitrate and in one article I found this (see https://www.anandtech.com/show/5295/logitechs-hd-pro-webcam-c920-enables-skyping-in-1080p): A follow-up to the Logitech HD Pro Webcam C910, this version brings an on-board H.264 encoder to enable full 1080p video encode without taxing the CPU.
The uncompressed streaming bitrates would not be maintainable for most attached software.
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Keith_MPS
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Keith_MPS
Posted 7 Years Ago
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Last Active: 2 Years Ago
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Yeah, if the camera can do compression then the numbers won't be too meaningful without knowing the compression rate. I didn't realize the webcams were doing compression on-camera.
- Keith
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theschemer
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theschemer
Posted 7 Years Ago
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Keith_MPS (10/9/2017) USB 2.0 can do a maximum of 480 mega bits per second (Mbps) in optimal conditions. You can find out how much bandwidth you need by calculating the resolution times the color bit depth times the frames per second.
640 (resolution width) 480 (resolution height) 24 (24-bit color depth) - I'm pretty sure most webcams capture in 24-bit color. But 32-bit may also be used on some. 30 (frames per second)
640x480x24x30 = 221,184,000 or 221Mbps
Getting 60 frames per second would be: 640x480x24x60 = 442,368,000 or 442Mbps
Both of those would still be usable on USB 2.0 (480Mbps)
But, if you want 1024x768 resolution at 30 fps, it wouldn't work on USB 2.0... 1024x768x24x30 = 567,889,920 bits per second. Too much for USB 2.0 to handle.
This will help you figure out what you're able to do on USB 2.0.
USB 2.0 is 480 megabits per second. USB 3.0 is 5 gibabits per second.Good info but I am at 640 x 480 and usually get 15 FPS and max 30 FPS so I think my USB ports are fine. Logitech isn't very helpful. I think I am going to return the camera as the image is grainy too. Also, I don't know if it is normal with all you guys that have it working but in the Gaming Software a few of the adjustment sliders and check boxes and auto check boxes are unable to be changed. Is that normal? Thanks, TS
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Kelleytoons
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Kelleytoons
Posted 7 Years Ago
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Group: Forum Members
Last Active: 2 hours ago
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I can only speak for USB 3.0 -- and, as I said, I would make sure if I were you that EVERYTHING else from USB is unplugged before you blame the camera. I don't think most of the stuff in the gaming software pertains to webcams, but I've never really paid attention as I'm just unchecking the low light (which, unfortunately, you have to do each and every time. You'd think it would keep that setting, but NO).
Alienware Aurora R12, Win 10, i9-119000KF, 3.5GHz CPU, 128GB RAM, RTX 3090 (24GB), Samsung 960 Pro 4TB M-2 SSD, TB+ Disk space Mike "ex-genius" Kelley
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theschemer
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theschemer
Posted 7 Years Ago
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Last Active: Last Year
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Kelleytoons (10/9/2017) I can only speak for USB 3.0 -- and, as I said, I would make sure if I were you that EVERYTHING else from USB is unplugged before you blame the camera.
I don't think most of the stuff in the gaming software pertains to webcams, but I've never really paid attention as I'm just unchecking the low light (which, unfortunately, you have to do each and every time. You'd think it would keep that setting, but NO).I tried unplugging all the stuff that I could but left the keyboard and mouse and headset as I would need to use those all anyway and it still doesn't work properly and is grainy image too. With more light the tracking doesn't work as good as when there is less light. I just called Amazon and another one is on its way. I am otherwise happy with the Faceware and the plugin but the camera seems to be hosing me. And with Logitech's tech support it looks like they are out of answers after me explaining all the things I have tried and how I am using it. I am able to use it even at 15 FPS but it is supposed to do better than that. Also, my Faceware screen defaults to 640x480 and you always mention 640x320 (or something lower) but I cannot change that except if I am using ManyCam for my streaming.
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Kelleytoons
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Kelleytoons
Posted 7 Years Ago
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Last Active: 2 hours ago
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It's VERY odd you can't get the right resolution when you press Ctrl-O ("O" as in "optimization"). The right resolution is actualy 640x360 (so I was a bit off) but it's definitely NOT 640x480. So I wonder how you really have your camera set up. You should, in settings, have low-light turned off (in the gaming software), and in the FW plugin you ought to be selecting 1280x720 (MJPG) (nothing else -- do NOT try selecting anything else or it won't work) and 60fps. With those settings I can easily get 60fps with truly crappy lighting (it's a very bright bulb, the LED equivalent of 150w, but it's aimed off to the side of me at a front wall, so it's mostly dark on my face). It tracks my face perfectly and the resolution looks fine. Perhaps you have a bad camera, but unless you try those exact settings (with USB 3.0) I wouldn't necessarily assume it.
Alienware Aurora R12, Win 10, i9-119000KF, 3.5GHz CPU, 128GB RAM, RTX 3090 (24GB), Samsung 960 Pro 4TB M-2 SSD, TB+ Disk space Mike "ex-genius" Kelley
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theschemer
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theschemer
Posted 7 Years Ago
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Group: Forum Members
Last Active: Last Year
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Kelleytoons (10/9/2017) It's VERY odd you can't get the right resolution when you press Ctrl-O ("O" as in "optimization"). The right resolution is actualy 640x360 (so I was a bit off) but it's definitely NOT 640x480.
So I wonder how you really have your camera set up. You should, in settings, have low-light turned off (in the gaming software), and in the FW plugin you ought to be selecting 1280x720 (MJPG) (nothing else -- do NOT try selecting anything else or it won't work) and 60fps.
With those settings I can easily get 60fps with truly crappy lighting (it's a very bright bulb, the LED equivalent of 150w, but it's aimed off to the side of me at a front wall, so it's mostly dark on my face). It tracks my face perfectly and the resolution looks fine.
Perhaps you have a bad camera, but unless you try those exact settings (with USB 3.0) I wouldn't necessarily assume it.Low light is turned off every time as it defaults to on. But in the Faceware plug-in I cannot (or do not know how to) change the setting. It does not allow me to change anything and when it says connecting to device, it keeps on looking like it is busy and I have to "X" out of the window after I see myself in the preview screen. And the setting is a 640x480. I got tired of fighting it. How and where do I change the FW plug-in to 1280x720 MJPG? Are you referring to ManyCam? Thanks
edit: And since Logitech had me switch to an older Gaming Software the Faceware plug- crashes and I have to restart it and then it works.
Edited
7 Years Ago by
theschemer
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martin.s
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martin.s
Posted 7 Years Ago
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Group: Forum Members
Last Active: Yesterday
Posts: 24,
Visits: 782
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Yes that's it! You HAVE to set FW to 1280x720 to EVEN have the option of 60fps. Then you need to disable low light in LGS. (The full Faceware Live Server has this built in, please build this into the next FW for iclone to save hassle) You have the option of optimization in FW which will bring the capture resolution to 640x360 if needed (recommended anyway). That's it, it works. You may have to adjust lighting to taste, but those are the settings to use. Thanks Mike!
Edited
7 Years Ago by
martin.s
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Kelleytoons
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Kelleytoons
Posted 7 Years Ago
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Group: Forum Members
Last Active: 2 hours ago
Posts: 9.1K,
Visits: 21.7K
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Glad you got it, Martin. Schemer -- in the FW plugin IF you have it set big enough (dragged down far enough) you will see menu options and one of them, under File perhaps? is Settings. However, with the FW window activated you can also just press the "S" key. There you will find the ability to select your camera AND the settings for that camera (and the frame rate). You need to choose that 1280x720 and, as Martin says, then you will have the ability to select 60fps. There are a lot of things FW could do to make this easier -- and of course it's a huge PITA to have to keep turning low-light off (but Logitech is unlikely to change this -- they don't appear to even care much about their webcam users. I still think there might be a way, programmatically, to change this but if I ever get the time I may have to venture to the Logitech forums and see if any users there have clues). The good news is that on the FW side it will *remember* what you last chose, so you only have to do that once (unless you change the source again).
Alienware Aurora R12, Win 10, i9-119000KF, 3.5GHz CPU, 128GB RAM, RTX 3090 (24GB), Samsung 960 Pro 4TB M-2 SSD, TB+ Disk space Mike "ex-genius" Kelley
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