a lightweight tool to stream one or more pixel components of the image or portion of the image to your choice of storage formats.
[options] input-file output-file
add an example, a script, a trick and tips
Baby monitor with netbook and smartphone
..software project presents a very efficient client-/server
backend to stream images from any webcam connected to a linux
pc to nearly every kind of client. The server-backend uses
v4l4j, client- and server-backend are completely written in
java. There is a swing frontend using the client (like hosted
in this project) and a beautiful android client (+widget)
available in the android market.
How linux command ":>" works?
The command isn't
:> it's just
bash (and probably some other shells) it's a built-in no-op
> redirects output to a file
(truncating it first). Since
: has no output, the
net result of your command line
: > file.log just
file.log zero length.
From my local
bash man page:
No effect; the command does nothing beyond expanding arguments
and performing any specified redirections. A zero exit code is
Linux DLNA Server
This post gives a pretty good breakdown of a
lot of choices.
Streaming audio over SSH.
You can use pulseaudio for streaming audio.
But i would suggest mounting remote filesystem on a local folder
using sshfs and playing files from there.
sshfs username@remotehost:/ mountfolder
How do you combine multiple ffserver streams into a grid in real time?
You are handling 16 streams, so your CPU has a hard job on it to
convert. You seriously need enough CPU power to handle all that
I also see you are scaling each video. Scaling is a very time
consuming process in a CPU. Maybe you can set up your camera
streams to provide a scaled video already, so your CPU only needs
to put them together.
You can also look for other options of encoding/decoding, because
some encoders are like 10 times faster than the others.
Recommendations for a really good DVB-T card for linux
My recommendation is the Hauppauge WinTV-HVR-2200. A linux driver has recently been developed
(though it only supports the digital tuners at present).
It's a really nice card - dual tuner, support for HD,
MPEG capture and it gives us a perfect signal on all UK
free-to-air DVB-T channels where other cards have struggled
finding more than two or three multiplexes.
Take a look to see if does all the stuff you want, but I can't
recommend it enough. It's also relatively cheap for a dual tuner
Edit: I should mention that I've only been using it under Windows
so under Linux YMMV, but the LinuxTV drivers are normally very
Is it possible to push multimedia content on DLNA TV from Linux?
Yes it's possible, check out servioo and this
Linux: set up media server to stream video via the Internet?
You can do it with ffserver(a component of ffmpeg). Details
-authenticate value decrypt image with this password
-channel type apply option to select image channels
-colorspace type alternate image colorspace
-compress type type of pixel compression when writing
define one or more image format options
-density geometry horizontal and vertical density of
-depth value image depth
-extract geometry extract area from image
-identify identify the format and characteristics of
-interlace type type of image interlacing scheme
-interpolate method pixel color interpolation method
-limit type value pixel cache resource limit
-map components one or more pixel components
-monitor monitor progress
-quantize colorspace reduce colors in this colorspace
-quiet suppress all warning messages
-regard-warnings pay attention to warning messages
horizontal and vertical sampling factor
-seed value seed a new sequence of pseudo-random
-set attribute value set an image attribute
-size geometry width and height of image
-storage-type type pixel storage type
-synchronize synchronize image to storage device
-verbose print detailed information about the image
virtual pixel access method
-debug events display copious debugging information
-help print program options
-log format format of debugging information
-list type print a list of supported option arguments
-version print version information
By default, the
image format of ’file’ is determined by its
magic number. To specify a particular image format, precede
the filename with an image format name and a colon (i.e.
ps:image) or specify the image type as the filename suffix
(i.e. image.ps). Specify ’file’ as
’-’ for standard input or output.
Copyright (C) 1999-2012 ImageMagick Studio LLC. Additional
copyrights and licenses apply to this software, see
Stream is a lightweight tool to stream one or more
pixel components of the image or portion of the image to your
choice of storage formats. It writes the pixel components as they
are read from the input image a row at a time making
stream desirable when working with large images or when
you require raw pixel components.
For more information about the stream command, point your browser
to file:///usr/share/doc/imagemagick/www/stream.html or