Logitech C920 & C930e

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mjgraves		#1 Posted : Saturday, August 29, 2015 6:04:23 PM(UTC)
Rank: Advanced Member Groups: Registered Joined: 7/1/2015(UTC) Posts: 1,151 Location: Houston TX Thanks: 319 times Was thanked: 263 time(s) in 233 post(s)		I've just found that I cannot get my Logitech webcams to use H264. I tried both the C920 and C930e. In both cases vMix 15.0.0.88 x64 returns an error message listing the resolution & codec combinations that are allowed. For Logitech C920: AddNewInput.The following are supported: 640x480 NTSC 30p MJPG 160x90 NTSC 30p MJPG 160x120 NTSC 30p MJPG 176x144 NTSC 30p MJPG 320x180 NTSC 30p MJPG 320x240 NTSC 30p MJPG 352x288 NTSC 30p MJPG 432x240 NTSC 30p MJPG 640x360 NTSC 30p MJPG 800x448 NTSC 30p MJPG 800x600 NTSC 30p MJPG 864x480 NTSC 30p MJPG 960x720 NTSC 30p MJPG 1024x576 NTSC 30p MJPG 1280x720 NTSC 30p MJPG 1600x896 NTSC 30p MJPG 1920x1080 NTSC 30p MJPG 640x480 NTSC 30p RGB 160x90 NTSC 30p RGB 160x120 NTSC 30p RGB 176x144 NTSC 30p RGB 320x180 NTSC 30p RGB 320x240 NTSC 30p RGB 352x288 NTSC 30p RGB 432x240 NTSC 30p RGB 640x360 NTSC 30p RGB 800x448 NTSC 30p RGB 800x600 NTSC 30p RGB 864x480 NTSC 30p RGB 960x720 NTSC 30p RGB 1024x576 NTSC 30p RGB 1280x720 NTSC 30p RGB 1600x896 NTSC 30p RGB 1920x1080 Unknown (2000000) RGB 2304x1296 Unknown (4999998) RGB 2304x1536 Unknown (4999998) RGB 640x480 NTSC 30p I420 160x90 NTSC 30p I420 160x120 NTSC 30p I420 176x144 NTSC 30p I420 320x180 NTSC 30p I420 320x240 NTSC 30p I420 352x288 NTSC 30p I420 432x240 NTSC 30p I420 640x360 NTSC 30p I420 800x448 NTSC 30p I420 800x600 NTSC 30p I420 864x480 NTSC 30p I420 960x720 NTSC 30p I420 1024x576 NTSC 30p I420 1280x720 NTSC 30p I420 1600x896 NTSC 30p I420 1920x1080 Unknown (2000000) I420 2304x1296 Unknown (4999998) I420 2304x1536 Unknown (4999998) I420 Unspecified error For Logitech C930e: AddNewInput.The following are supported: 640x480 NTSC 30p YUY2 640x480 NTSC 30p YUY2 160x120 NTSC 30p YUY2 160x120 NTSC 30p YUY2 176x144 NTSC 30p YUY2 176x144 NTSC 30p YUY2 320x180 NTSC 30p YUY2 320x180 NTSC 30p YUY2 320x240 NTSC 30p YUY2 320x240 NTSC 30p YUY2 352x288 NTSC 30p YUY2 352x288 NTSC 30p YUY2 424x240 NTSC 30p YUY2 424x240 NTSC 30p YUY2 480x270 NTSC 30p YUY2 480x270 NTSC 30p YUY2 640x360 NTSC 30p YUY2 640x360 NTSC 30p YUY2 800x448 NTSC 30p YUY2 800x448 NTSC 30p YUY2 800x600 FILM 24p YUY2 800x600 FILM 24p YUY2 848x480 NTSC 30p YUY2 848x480 NTSC 30p YUY2 960x540 Unknown (666666) YUY2 960x540 Unknown (666666) YUY2 1024x576 Unknown (666666) YUY2 1024x576 Unknown (666666) YUY2 1280x720 Unknown (1000000) YUY2 1280x720 Unknown (1000000) YUY2 1600x896 Unknown (1333333) YUY2 1600x896 Unknown (1333333) YUY2 1920x1080 Unknown (2000000) YUY2 1920x1080 Unknown (2000000) YUY2 640x480 NTSC 30p MJPG 640x480 NTSC 30p MJPG 160x120 NTSC 30p MJPG 160x120 NTSC 30p MJPG 176x144 NTSC 30p MJPG 176x144 NTSC 30p MJPG 320x180 NTSC 30p MJPG 320x180 NTSC 30p MJPG 320x240 NTSC 30p MJPG 320x240 NTSC 30p MJPG 352x288 NTSC 30p MJPG 352x288 NTSC 30p MJPG 424x240 NTSC 30p MJPG 424x240 NTSC 30p MJPG 480x270 NTSC 30p MJPG 480x270 NTSC 30p MJPG 640x360 NTSC 30p MJPG 640x360 NTSC 30p MJPG 800x448 NTSC 30p MJPG 800x448 NTSC 30p MJPG 800x600 NTSC 30p MJPG 800x600 NTSC 30p MJPG 848x480 NTSC 30p MJPG 848x480 NTSC 30p MJPG 960x540 NTSC 30p MJPG 960x540 NTSC 30p MJPG 1024x576 NTSC 30p MJPG 1024x576 NTSC 30p MJPG 1280x720 NTSC 30p MJPG 1280x720 NTSC 30p MJPG 1600x896 NTSC 30p MJPG 1600x896 NTSC 30p MJPG 1920x1080 NTSC 30p MJPG 1920x1080 NTSC 30p MJPG Unspecified error While this definitely isn't a show-stopper, it does seem odd. I was trying to evaluate the difference in latency between using MJPEG and H264. Found I could not actually get H264 from the cameras. FWIW, I'm running Windows 10 Pro 64 bit. I was more-or-less forced into upgrading by a hard drive failure. I saw little point in rebuilding the system anew using Windows 7 Pro. Michael Graves
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kgoodyer		#2 Posted : Monday, August 31, 2015 10:09:33 PM(UTC)
Rank: Advanced Member Groups: Registered Joined: 6/16/2015(UTC) Posts: 193 Location: Milton Keynes, UK Thanks: 10 times Was thanked: 53 time(s) in 27 post(s)		I would be interested in anybody that has any information about this as well, I am trying to write some software to use webcams, and decided I would exclusively support C920 because of the built in H.264 encoder. As you have discoverd, there seems to be no access to the encoders output. I heard unofficially that the H.264 interface has exclusively only been made available to Microsoft (Skype), I expect so they could get a steel on high performance HD video conferencing. Unfortunately I am a little constrained as the software I am writing is in flash, so it can be executed within vMix, however I could write an external desktop app, and use desktop capture. All The Best Keith
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admin		#3 Posted : Monday, August 31, 2015 10:21:43 PM(UTC)
Rank: Administration Groups: Administrators Joined: 1/13/2010(UTC) Posts: 5,208 Location: Gold Coast, Australia Was thanked: 4288 time(s) in 1520 post(s)		You are correct Keith, Logitech does not make the H264 interface available or at least I haven't found any documentation for it. I seem to recall it being available in old driver versions for the C920, but I might be wrong about that.
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admin		#4 Posted : Monday, August 31, 2015 10:24:34 PM(UTC)
Rank: Administration Groups: Administrators Joined: 1/13/2010(UTC) Posts: 5,208 Location: Gold Coast, Australia Was thanked: 4288 time(s) in 1520 post(s)		Here is an interesting thread that seems to indicate forcing the generic Microsoft driver will bring up H264 support: http://forums.logitech.c...ws-8/td-p/1345019/page/2
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mjgraves		#5 Posted : Tuesday, September 1, 2015 1:02:16 PM(UTC)
Rank: Advanced Member Groups: Registered Joined: 7/1/2015(UTC) Posts: 1,151 Location: Houston TX Thanks: 319 times Was thanked: 263 time(s) in 233 post(s)		There seems some potential in using the generic UVC driver. I went about "updating" the driver on my Windows 10 system. In so doing, I selected the basic UVC video device over the manufacturers driver. With this done it seems that I could get the C920 to deliver 720p30 H264 to vMix. The video was initially ok, but quickly turned blocky, freezing occasionally. So something is still not right. One thing is clear, there is some latency to the H264 stream that you won't see with any other video format. MJPG would seem to offer both reduced USB bandwidth and low latency. Michael
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