mjpg-streamer-experimental error

Question

pi@raspberrypi:~ $ /usr/local/bin/mjpg_streamer -i "input_uvc.so -r 1280x720 -d /dev/video0 -f 15 -q 80" -o "output_http.so -p 8080 -w /usr/local/share/mjpg-streamer/www"

MJPG Streamer Version: git rev: f387bb44e6c087271b763b27da998bf2e06c4f5d

i: Using V4L2 device.: /dev/video0

i: Desired Resolution: 1280 x 720

i: Frames Per Second.: 15

i: Format............: JPEG

i: TV-Norm...........: DEFAULT

i: The specified resolution is unavailable, using: width 640 height 480 instead

i: Could not obtain the requested pixelformat: MJPG , driver gave us: YUYV

... will try to handle this by checking against supported formats. 

... Falling back to YUV mode (consider using -yuv option). Note that this

requires much more CPU power

UVCIOC_CTRL_ADD - Error at Pan (relative): Inappropriate ioctl for device (25)

UVCIOC_CTRL_ADD - Error at Tilt (relative): Inappropriate ioctl for device (25)

UVCIOC_CTRL_ADD - Error at Pan Reset: Inappropriate ioctl for device (25)

UVCIOC_CTRL_ADD - Error at Tilt Reset: Inappropriate ioctl for device (25)

UVCIOC_CTRL_ADD - Error at Pan/tilt Reset: Inappropriate ioctl for device (25)

UVCIOC_CTRL_ADD - Error at Focus (absolute): Inappropriate ioctl for device (25)

UVCIOC_CTRL_MAP - Error at Pan (relative): Inappropriate ioctl for device (25)

UVCIOC_CTRL_MAP - Error at Tilt (relative): Inappropriate ioctl for device (25)

UVCIOC_CTRL_MAP - Error at Pan Reset: Inappropriate ioctl for device (25)

UVCIOC_CTRL_MAP - Error at Tilt Reset: Inappropriate ioctl for device (25)

UVCIOC_CTRL_MAP - Error at Pan/tilt Reset: Inappropriate ioctl for device (25)

UVCIOC_CTRL_MAP - Error at Focus (absolute): Inappropriate ioctl for device (25)

UVCIOC_CTRL_MAP - Error at LED1 Mode: Inappropriate ioctl for device (25)

UVCIOC_CTRL_MAP - Error at LED1 Frequency: Inappropriate ioctl for device (25)

UVCIOC_CTRL_MAP - Error at Disable video processing: Inappropriate ioctl for

device (25)

UVCIOC_CTRL_MAP - Error at Raw bits per pixel: Inappropriate ioctl for device

(25)

o: www-folder-path......: /usr/local/share/mjpg-streamer/www/

o: HTTP TCP port........: 8080

o: HTTP Listen Address..: (null)

o: username:password....: disabled

o: commands.............: enabled

What's the problem?

I need help!

Answer 1

This is not an error per se. Your camera just does not support fancy features that mjpeg-streamer provides. mjpeg-streamer was primarily built to stream images from USB-WebCams that provide images as compressed JPEG (an Motion-JPEG stream hence MJPG) and camera movements.

Your WebCam obviously does not provide images in JPEG but YUVU, which is a raw sensor format. Therefore your Pi has to do the heavy lifting and convert the image into JPEG and create an Motion-JPEG stream out of it.

This does not take any advantage of the Raspberry Pi's hardware JPEG encoding capabilities. In my case this uses one complete core on a Raspberry Pi 2 Model B. Therefore I've written some program that does basically the same as mjpeg-streamer but that takes advantage of the hardware JPEG encoder to reduce the load on the CPU.

I've called it PICS Pi Improved Camera Streaming and you can find it on github. This reduces the CPU usage to about 1/10th of a Pi 2 core.
Another improvement is that the camera is being turned off if noone is watching the stream. This feels much better if your camera has an inicator light. With mjpeg-streamer your camera is constantly on and the image data just gets wasted and also wastes-power.