NAME

       ustreamer - stream MJPG video from any V4L2 device to the network

SYNOPSIS

       ustreamer [OPTIONS]

DESCRIPTION

       µStreamer (ustreamer) is a lightweight and very quick server to stream MJPG video from any V4L2 device to
       the  network.  All  new  browsers have native support of this video format, as well as most video players
       such as mplayer, VLC etc. µStreamer is a part of the Pi-KVM project  designed  to  stream  VGA  and  HDMI
       screencast hardware data with the highest resolution and FPS possible.

USAGE

       Without  arguments, ustreamer will try to open /dev/video0 with 640x480 resolution and start streaming on
       http://127.0.0.1:8080. You can override this behavior using parameters --device, --host and  --port.  For
       example, to stream to the world, run: ustreamer --device=/dev/video1 --host=0.0.0.0 --port=80

       Please  note  that  since  µStreamer  v2.0  cross-domain  requests  were disabled by default for security
       reasons. To enable the old behavior, use the option --allow-origin=\*.

       For example, the recommended way of running µStreamer with Auvidea B101 on a Raspberry Pi is:

       ustreamer \
              --format=uyvy \ # Device input format
              --encoder=omx \ # Hardware encoding with OpenMAX
              --workers=3 \ # Maximum workers for OpenMAX
              --persistent \ # Don´t re-initialize device on timeout (for example when HDMI cable was disconnected)
              --dv-timings \ # Use DV-timings
              --drop-same-frames=30 # Save the traffic

       Please note that to use --drop-same-frames for different browsers you need to use some specific URL /stream parameters (see URL / for details).

       You can always view the full list of options with ustreamer --help. Some features may not be available on your platform. To find out which features are enabled, use ustreamer --features.

OPTIONS

   Capturing options
       -d /dev/path, --device /dev/path
              Path to V4L2 device. Default: /dev/video0.

       -i N, --input N
              Input channel. Default: 0.

       -r WxH, --resolution WxH
              Initial image resolution. Default: 640x480.

       -m fmt, --format fmt
              Image format.  Available: YUYV, UYVY, RGB565, RGB24, JPEG; default: YUYV.

       -a std, --tv-standard std
              Force TV standard.  Available: PAL, NTSC, SECAM; default: disabled.

       -I method, --io-method method
              Set V4L2 IO method (see kernel  documentation).  Changing  of  this  parameter  may  increase  the
              performance. Or not.  Available: MMAP, USERPTR; default: MMAP.

       -f N, --desired-fps N
              Desired FPS. Default: maximum possible.

       -z N, --min-frame-size N
              Drop  frames  smaller  then  this limit. Useful if the device produces small-sized garbage frames.
              Default: 128 bytes.

       -n, --persistent
              Don't re-initialize device on timeout. Default: disabled.

       -t, --dv-timings
              Enable DV timings  querying  and  events  processing  to  automatic  resolution  change.  Default:
              disabled.

       -b N, --buffers N
              The  number  of  buffers  to  receive  data  from  the  device. Each buffer may processed using an
              independent thread.  Default: 2 (the number of CPU cores (but not more than 4) + 1).

       -w N, --workers N
              The number of worker threads but not more than buffers.  Default: 1 (the number of CPU cores  (but
              not more than 4)).

       -q N, --quality N
              Set  quality  of  JPEG  encoding  from 1 to 100 (best). Default: 80.  Note: If HW encoding is used
              (JPEG source format selected), this parameter attempts to configure the camera or  capture  device
              hardware's  internal  encoder.  It does not re-encode MJPG to MJPG to change the quality level for
              sources that already output MJPG.

       -c type, --encoder type
              Use specified encoder. It may affect the number of workers.

              CPU ─ Software MJPG encoding (default).

              OMX ─ GPU hardware accelerated MJPG encoding with OpenMax (required WITH_OMX feature).

              HW ─ Use pre-encoded MJPG frames directly from camera hardware.

              NOOP ─ Don't compress MJPG stream (do nothing).

       -g WxH,..., --glitched-resolutions WxH,...
              It doesn't do anything. Still here for compatibility. Required WITH_OMX feature.

       -k path, --blank path
              Path to JPEG file that will be shown  when  the  device  is  disconnected  during  the  streaming.
              Default: black screen 640x480 with 'NO SIGNAL'.

       -K sec, --last-as-blank sec
              Show the last frame received from the camera after it was disconnected, but no more than specified
              time  (or endlessly if 0 is specified). If the device has not yet been online, display 'NO SIGNAL'
              or the image specified by option --blank. Note: currently this option  has  no  effect  on  memory
              sinks. Default: disabled.

       -l, --slowdown
              Slowdown capturing to 1 FPS or less when no stream or sink clients are connected. Useful to reduce
              CPU consumption. Default: disabled.

       --device-timeout sec
              Timeout for device querying. Default: 1.

       --device-error-delay sec
              Delay  before trying to connect to the device again after an error (timeout for example). Default:
              1.

   Image control options
       --image-default
              Reset all image settings below to default. Default: no change.

       --brightness N, auto, default
              Set brightness. Default: no change.

       --contrast N, default
              Set contrast. Default: no change.

       --saturation N, default
              Set saturation. Default: no change.

       --hue N, auto, default
              Set hue. Default: no change.

       --gamma N, default
              Set gamma. Default: no change.

       --sharpness N, default
              Set sharpness. Default: no change.

       --backlight-compensation N, default
              Set backlight compensation. Default: no change.

       --white-balance N, auto, default
              Set white balance. Default: no change.

       --gain N, auto, default
              Set gain. Default: no change.

       --color-effect N, default
              Set color effect. Default: no change.

       --flip-vertical 1, 0, default
              Set vertical flip. Default: no change.

       --flip-horizontal 1, 0, default
              Set horizontal flip. Default: no change.

   HTTP server options
       -s address, --host address
              Listen on Hostname or IP. Default: 127.0.0.1.

       -p N, --port N
              Bind to this TCP port. Default: 8080.

       -U path, --unix path
              Bind to UNIX domain socket. Default: disabled.

       -d, --unix-rm
              Try to remove old unix socket file before binding. default: disabled.

       -M mode, --unix-mode mode
              Set UNIX socket file permissions (like 777). Default: disabled.

       --user name
              HTTP basic auth user. Default: disabled.

       --passwd str
              HTTP basic auth passwd. Default: empty.

       --static path
              Path to dir with static files instead of embedded root index page. Symlinks are not supported  for
              security reasons. Default: disabled.

       -e N, --drop-same-frames N
              Don't  send  identical  frames to clients, but no more than specified number. It can significantly
              reduce the outgoing traffic, but will increase the CPU loading. Don't use this option with  analog
              signal sources or webcams, it's useless. Default: disabled.

       -R WxH, --fake-resolution WxH
              Override image resolution for the /state. Default: disabled.

       --tcp-nodelay
              Set TCP_NODELAY flag to the client /stream socket. Ignored for --unix.  Default: disabled.

       --allow-origin str
              Set Access-Control-Allow-Origin header. Default: disabled.

       --server-timeout sec
              Timeout for client connections. Default: 10.

   JPEG sink options
       With shared memory sink you can write a stream to a file. See ustreamer-dump(1) for more info.

       --sink name
              Use the specified shared memory object to sink JPEG frames. Default: disabled.

       --sink-mode mode
              Set JPEG sink permissions (like 777). Default: 660.

       --sink-rm
              Remove shared memory on stop. Default: disabled.

       --sink-client-ttl sec
              Client TTL. Default: 10.

       --sink-timeout sec
              Timeout for lock. Default: 1.

   H264 sink options
       Available only if WITH_OMX feature enabled.

       --h264-sink name
              Use the specified shared memory object to sink H264 frames encoded by MMAL. Default: disabled.

       --h264-sink-mode mode
              Set H264 sink permissions (like 777). Default: 660.

       --h264-sink-rm
              Remove shared memory on stop. Default: disabled.

       --h264-sink-client-ttl sec
              Client TTL. Default: 10.

       --h264-sink-timeout sec
              Timeout for lock. Default: 1.

       --h264-bitrate kbps
              H264 bitrate in Kbps. Default: 5000.

       --h264-gop N
              Intarval between keyframes. Default: 30.

   Process options
       --exit-on-parent-death
              Exit the program if the parent process is dead. Required HAS_PDEATHSIG feature. Default: disabled.

       --process-name-prefix str
              Set  process  name  prefix  which  will  be  displayed  in  the  process list like 'str: ustreamer
              --blah-blah-blah'. Required WITH_SETPROCTITLE feature. Default: disabled.

       --notify-parent
              Send SIGUSR2 to the parent process when the stream parameters are  changed.  Checking  changes  is
              performed for the online flag and image resolution. Required WITH_SETPROCTITLE feature.

   GPIO options
       Available only if WITH_GPIO feature enabled.

       --gpio-device /dev/path
              Path to GPIO character device. Default: /dev/gpiochip0.

       --gpio-consumer-prefix str
              Consumer prefix for GPIO outputs. Default: ustreamer.

       --gpio-prog-running pin
              Set 1 on GPIO pin while µStreamer is running. Default: disabled.

       --gpio-stream-online pin
              Set 1 while streaming. Default: disabled.

       --gpio-has-http-clients pin
              Set 1 while stream has at least one client. Default: disabled.

   Logging options
       --log-level N
              Verbosity  level of messages from 0 (info) to 3 (debug). Enabling debugging messages can slow down
              the program.  Available levels: 0 (info), 1 (performance), 2 (verbose), 3 (debug).  Default: 0.

       --perf Enable performance messages (same as --log-level=1). Default: disabled.

       --verbose
              Enable verbose messages and lower (same as --log-level=2). Default: disabled.

       --debug
              Enable debug messages and lower (same as --log-level=3). Default: disabled.

       --force-log-colors
              Force color logging. Default: colored if stderr is a TTY.

       --no-log-colors
              Disable color logging. Default: ditto.

   Help options
       -h, --help
              Print this text and exit.

       -v, --version
              Print version and exit.

       --features
              Print list of supported features.

SEE ALSO

       ustreamer-dump(1)

BUGS

       Please file any bugs and issues at https://github.com/pikvm/ustreamer/issues

AUTHOR

       Maxim Devaev <mdevaev@gmail.com>

HOMEPAGE

       https://pikvm.org/

COPYRIGHT

       GNU General Public License v3.0

November 2020                                      version 4.9                                      USTREAMER(1)