Then it is not supported by your webcam and you need to rotate the image on the website like we do. Not all usb webcams support it. See help output of input_uvc plugin in mjpg_streamer:
<blockquote class="Quote">mjpg_streamer -i "/usr/local/lib/mjpg-streamer/input_uvc.so --help"MJPG Streamer Version.: 2.0 --------------------------------------------------------------- Help for input plugin..: UVC webcam grabber --------------------------------------------------------------- The following parameters can be passed to this plugin:
[-d | --device ].......: video device to open (your camera) [-r | --resolution ]...: the resolution of the video device, can be one of the following strings: QQVGA QCIF CGA QVGA CIF PAL VGA SVGA XGA HD SXGA UXGA FHD or a custom value like the following example: 640x480 [-f | --fps ]..........: frames per second (camera may coerce to different value) [-q | --quality ] .....: set quality of JPEG encoding [-m | --minimum_size ].: drop frames smaller then this limit, useful if the webcam produces small-sized garbage frames may happen under low light conditions [-e | --every_frame ]..: drop all frames except numbered [-n | --no_dynctrl ]...: do not initalize dynctrls of Linux-UVC driver [-l | --led ]..........: switch the LED "on", "off", let it "blink" or leave it up to the driver using the value "auto" [-t | --tvnorm ] ......: set TV-Norm pal, ntsc or secam [-u | --uyvy ] ........: Use UYVY format, default: MJPEG (uses more cpu power) [-y | --yuv ] ........: Use YUV format, default: MJPEG (uses more cpu power) [-fourcc ] ............: Use FOURCC codec 'argopt', currently supported codecs are: RGB24, RGBP [-timestamp ]..........: Populate frame timestamp with system time [-softfps] ............: Drop frames to try and achieve this fps set your camera to its maximum fps to avoid stuttering [-timeout] ............: Timeout for device querying (seconds) [-dv_timings] .........: Enable DV timings queriyng and events processing ---------------------------------------------------------------
Optional parameters (may not be supported by all cameras):
[-br ].................: Set image brightness (auto or integer) [-co ].................: Set image contrast (integer) [-sh ].................: Set image sharpness (integer) [-sa ].................: Set image saturation (integer) [-cb ].................: Set color balance (auto or integer) [-wb ].................: Set white balance (auto or integer) [-ex ].................: Set exposure (auto, shutter-priority, aperature-priority, or integer) [-bk ].................: Set backlight compensation (integer) [-rot ]................: Set image rotation (0-359) [-hf ].................: Set horizontal flip (true/false) [-vf ].................: Set vertical flip (true/false) [-pl ].................: Set power line filter (disabled, 50hz, 60hz, auto) [-gain ]...............: Set gain (auto or integer) [-cagc ]...............: Set chroma gain control (auto or integer) ---------------------------------------------------------------
