Support for H264 in webcams? UVC?

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Support for H264 in webcams? UVC?

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mjgraves		#1 Posted : Tuesday, July 31, 2018 2:48:26 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)		Today I tried connecting a Logitech C922 Pro Stream webcam to the latest vMix release (21.0.0.53.) I wanted to evaluate the latency introduced by using H.264 encoding. The C922 does support H.264 encoding. I've used it in the mode in the past. https://en.wikipedia.org...nboard_video_compression I found that vMix did not allow the use of H.264 with this webcam. It returned an error, with a list of allowed resolutions & encoding types as follows: 2304x1296 Unknown (4999998) YUY2 2304x1536 Unknown (4999998) YUY2 2304x1536 Unknown (4999998) YUY2 640x480 NTSC 30p MJPG 640x480 NTSC 30p MJPG 160x90 NTSC 30p MJPG 160x90 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 432x240 NTSC 30p MJPG 432x240 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 864x480 NTSC 30p MJPG 864x480 NTSC 30p MJPG 960x720 NTSC 30p MJPG 960x720 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 Thinking this odd, I reached for a C920...and found a similar result. vMix does not allow H.264. This time the error returned the following: 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 Thinking this now very odd, I grabbed a C930e. Same result. 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 2304x1296 Unknown (4999998) YUY2 2304x1296 Unknown (4999998) YUY2 2304x1536 Unknown (4999998) YUY2 2304x1536 Unknown (4999998) 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 It seems that H.264 access to UVC devices is in some manner broken.
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kgoodyer		#2 Posted : Friday, August 31, 2018 1:29:02 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)		Are you using the Logitech or Microsoft UVC drivers? I found only the Microsoft UVC drivers worked properly (the irony), but unsure if I was using MJPEG or h.264.
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mjgraves		#3 Posted : Tuesday, September 11, 2018 11:44:13 AM(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)		kgoodyer wrote: Are you using the Logitech or Microsoft UVC drivers? I found only the Microsoft UVC drivers worked properly (the irony), but unsure if I was using MJPEG or h.264. Good question. I thought I was using the Microsoft UVC driver. But it's possible that since installing Camera Settings associated with Brio I am using the Logitech driver.
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