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| mriesch | is there a way to get a higher framerate from the vivid webcam capture device?
it seems at 1080p 5 fps is the maximum | [08:20] |
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| pinchartl | mriesch: it's limited by the CPU power, as the test pattern is generated by the CPU
it could be increased by avoiding all the CPU-based processing ah no, vivid, not vimc. I don't think there's any processing then but still, the test pattern is generated by the CPU so there's a bottleneck there | [14:18] |
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| mriesch | pinchartl: ok, that confirms what i already was afraid of. nevertheless thanks for the confirmation. | [14:49] |
| kbingham | mriesch, I'm sure there are artificial delays in vivid though.
I suspect the 5 FPS is a soft limitation. I'm sure I recall editing a table in vivid to add different distinct sizes and rates in the past. | [14:55] |
| mriesch | kbingham: ah ok. not sure how to proceed here, i need a test input for benchmarking but 5fps is not quite the challenge i was aiming for :-) i think i'll look for a different input device | [14:58] |
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| kbingham | mriesch, the 'magic' happens around https://elixir.bootlin.com/linux/v5.15-rc1/source/drivers/media/test-drivers/vivid/vivid-vid-cap.c#L54
There is a list of webcam sizes, and webcam intervals. It's arragned so that as the framesize increases, it supports less intervals. (To 'simulate' webcams with different framerates for different frame sizes I expect) You can change { 1, 5 } to {1, 60 } to bump it up I suspect. | [15:18] |
| mriesch | kbingham: i'll try that in a sec | [15:20] |
| kbingham | or hack https://elixir.bootlin.com/linux/v5.15-rc1/source/drivers/media/test-drivers/vivid/vivid-vid-cap.c#L1854 so that it returns all frame intervals for all framesizes instead. | [15:21] |
| mriesch | kbingham: that did the trick, thanks a lot :-) | [15:24] |
| kbingham | great, hope it helps.
Let us know what maximum frame rates you get, and where the actual limits might lie ... I wonder if it's worth adding an 'HD' webcam mode to vivid ;-) | [15:24] |
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| mriesch | kbingham: can do. bets on the max. frame rate, anyone? (on a rockchip rk3568) | [15:29] |
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| mriesch | kbingham: 1080p@1200 fps seems to work fine. for 2400 fps i get timestamping warnings from my gst pipeline | [16:02] |
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| ndufresne | never even thought of possibly running a gst pipeline at such a high rate
mriesch: good way to benchmark gst internal overhead | [21:29] |
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