video using webcamd on Raspberry Pi 3

[Hans Petter Selasky]

On 09/30/17 22:49, Curtis Villamizar wrote:
> On 09/30/17 14:11, Hans Petter Selasky wrote:
>> lsusb -v 
> 
> The output is 740 lines long.  Here are the bDescriptorSubtype lines:
> 
>          bDescriptorSubtype      1 (HEADER)
>          bDescriptorSubtype      3 (OUTPUT_TERMINAL)
>          bDescriptorSubtype      6 (EXTENSION_UNIT)
>          bDescriptorSubtype      2 (INPUT_TERMINAL)
>          bDescriptorSubtype      5 (PROCESSING_UNIT)
>          bDescriptorSubtype                  1 (INPUT_HEADER)
>          bDescriptorSubtype                  6 (FORMAT_MJPEG)
>          bDescriptorSubtype                  7 (FRAME_MJPEG)
>          bDescriptorSubtype                  7 (FRAME_MJPEG)
>          bDescriptorSubtype                  7 (FRAME_MJPEG)
>          bDescriptorSubtype                  7 (FRAME_MJPEG)
>          bDescriptorSubtype                  7 (FRAME_MJPEG)
>          bDescriptorSubtype                  7 (FRAME_MJPEG)
>          bDescriptorSubtype                  7 (FRAME_MJPEG)
>          bDescriptorSubtype                  7 (FRAME_MJPEG)
>          bDescriptorSubtype                  3 (STILL_IMAGE_FRAME)
>          bDescriptorSubtype                  4 (FORMAT_UNCOMPRESSED)
>          bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
>          bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
>          bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
>          bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
>          bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
>          bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
>          bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
>          bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
>          bDescriptorSubtype                  3 (STILL_IMAGE_FRAME)
>          bDescriptorSubtype                 13 (COLORFORMAT)
>          bDescriptorSubtype      1 (HEADER)
>          bDescriptorSubtype      2 (INPUT_TERMINAL)
>          bDescriptorSubtype      6 (FEATURE_UNIT)
>          bDescriptorSubtype      3 (OUTPUT_TERMINAL)
>          bDescriptorSubtype      1 (AS_GENERAL)
>          bDescriptorSubtype      2 (FORMAT_TYPE)
>            bDescriptorSubtype      1 (EP_GENERAL)
> 
> The format is MJPEG or raw.
> 
> For the resolution of 320x240 we have:
> 
>        VideoStreaming Interface Descriptor:
>          bLength                            30
>          bDescriptorType                    36
>          bDescriptorSubtype                  7 (FRAME_MJPEG)
>          bFrameIndex                         4
>          bmCapabilities                   0x00
>            Still image unsupported
>          wWidth                            320
>          wHeight                           240
>          dwMinBitRate                 37005360
>          dwMaxBitRate                 37005360
>          dwMaxVideoFrameBufferSize      154189
>          dwDefaultFrameInterval         333333
>          bFrameIntervalType                  1
>          dwFrameInterval( 0)            333333
> 
>        VideoStreaming Interface Descriptor:
>          bLength                            30
>          bDescriptorType                    36
>          bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
>          bFrameIndex                         4
>          bmCapabilities                   0x00
>            Still image unsupported
>          wWidth                            320
>          wHeight                           240
>          dwMinBitRate                 36864000
>          dwMaxBitRate                 36864000
>          dwMaxVideoFrameBufferSize      153600
>          dwDefaultFrameInterval         333333
>          bFrameIntervalType                  1
>          dwFrameInterval( 0)            333333
> 
> This still doesn't work with 160x120 and 5 fps so probably not a CPU 
> issue, but I could be wrong.  OTOH I just got a kernel panic while 
> running 160x120.  It doesn't seem related based on where it was. I'm 
> running that again and no panic so far but also nothing on the screen 
> even after quite a few minutes.
> 

Hi,

Can you check dmesg if there are any errors?

Can you further check "top" for CPU usage.

--HPS