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It is possible to use the [[Nokia N800|N800]] and [[Nokia N900|N900]] camera as a source of streaming video.
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{{Midgard article}}
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== N800 ==
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It is possible to use the N800 camera as a source of streaming video. This was originally described [https://maemo.org/community/wiki/howtostreamvideo/ here], but the referenced example has an error which prevents it working.
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This was originally described [https://maemo.org/community/wiki/howtostreamvideo/ here], but the referenced example has an error which prevents it from working.
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This note describes how to stream video from the platform to an RTP sink, for example the [https://maemo.org/community/wiki/howtostreamvideo/ vlc] media player.
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This note describes how to stream video from the platform to an RTP sink, for example the [[VLC]] media player.
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# Install the necessary gstreamer packages. The following list may be excessive, but "works":
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#* gstreamer-tools
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#* gstreamer0.10-3gp-osso
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#* gstreamer0.10-adpcm-osso
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#* gstreamer0.10-ffmpeg-osso
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#* gstreamer0.10-gnomevfs
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#* gstreamer0.10-hantro
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#* gstreamer0.10-id3lib-osso
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#* gstreamer0.10-mpeg1demux-osso
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#* gstreamer0.10-mpegstream-osso
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#* gstreamer0.10-plugins-bad
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#* gstreamer0.10-plugins-base
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#* gstreamer0.10-plugins-base-extra
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#* gstreamer0.10-plugins-base-kulve
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#* gstreamer0.10-plugins-good
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#* gstreamer0.10-plugins-good-extra
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#* gstreamer0.10-plugins-good-kulve
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#* gstreamer0.10-tools
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#* gstreamer0.10-wma
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# On the N800, the following script will stream video from the camera. Here, 172.31.0.244 is the Linux box with VLC installed, and 172.31.0.245 is the N800. I call this script <tt>~/bin/rtpstream.sh</tt>.<br/> <tt><nowiki>#!/bin/sh</nowiki></tt><br/>
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<tt>VPORT=5434</tt><br/> <tt>APORT=5432</tt><br/> <tt>HOST=${1:-172.31.0.244}</tt><br/>
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<tt>gst-launch-0.10 v4l2src ! \</tt><br/> <tt>video/x-raw-yuv,width=176,height=144,framerate=\(fraction\)15/1 ! \</tt><br/> <tt>hantro4200enc stream-type=1 profile-and-level=1001 ! \</tt><br/> <tt>video/x-h263,framerate=\(fraction\)15/1 ! rtph263ppay mtu=1438 ! \</tt><br/> <tt>udpsink host=$HOST port=$VPORT dsppcmsrc ! queue ! \</tt><br/> <tt>audio/x-raw-int,channels=1,rate=8000 ! mulawenc ! rtppcmupay mtu=1438 ! \</tt><br/>      udpsink host=$HOST port=$APORT
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# On the Linux box, the sample .sdp file from [http://web.media.mit.edu/%7Elifton/snippets/n800_to_sl/ the original article], with the address of our VLC player, saved as a file i.e. <tt>/tmp/n800.sdp</tt><br/> <tt>v=0</tt><br/> <tt>o=- 37 614155991 IN IP4 127.0.0.0</tt><br/> <tt>s=QuickTime</tt><br/> <tt>t=0 0</tt><br/> <tt>a=range:npt=now-</tt><br/> <tt>m=audio 5432 RTP/AVP 0</tt><br/> <tt>c=IN IP4 172.31.0.245</tt><br/> <tt>b=AS:63</tt><br/> <tt>m=video 5434 RTP/AVP 96</tt><br/> <tt>c=IN IP4 172.31.0.245</tt><br/> <tt>a=rtpmap:96 H263-2000/90000</tt><br/> <tt>a=fmtp:96 </tt><br/> <tt>a=cliprect:0,0,144,176</tt><br/>  a=framesize:96 176-144
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# On the N800, pop out the camera and run:<br/>  $ ~/bin/rtpstream.sh # assume on PATH, +x etc.
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# On Linux box (note VLC runs on other platforms as well):<br/>  $ vlc /tmp/n800.sdp
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# Enjoy streaming video (and sound) from the N800.
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First, you must install the '''gstreamer-tools''' package from the diablo repo on repository.maemo.org.
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Thanks to [http://web.media.mit.edu/%7Elifton/snippets/n800_to_sl/ Josh Lifton] for the original leg work.
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* On the N800, the following script will stream video from the camera. Here, 172.31.0.244 is the Linux box with VLC installed, and 172.31.0.245 is the N800. I call this script <code>~/bin/rtpstream.sh</code>.
 
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#!/bin/sh
 
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VPORT=5434
 
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APORT=5432
 
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HOST=${1:-172.31.0.244}
 
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gst-launch-0.10 v4l2src ! video/x-raw-yuv,width=176,height=144,framerate=\(fraction\)15/1 ! hantro4200enc stream-type=1 profile-and-level=1001 ! video/x-h263,framerate=\(fraction\)15/1 ! rtph263ppay mtu=1438 ! udpsink host=$HOST port=$VPORT dsppcmsrc ! queue ! audio/x-raw-int,channels=1,rate=8000 ! mulawenc ! rtppcmupay mtu=1438 ! udpsink host=$HOST port=$APORT
 
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* On the Linux box, the sample .sdp file from [http://web.media.mit.edu/%7Elifton/snippets/n800_to_sl/ the original article], with the address of our VLC player, saved as a file i.e. <code>/tmp/n800.sdp</code>
 
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v=0
 
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o=- 37 614155991 IN IP4 127.0.0.0
 
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s=QuickTime
 
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t=0 0
 
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a=range:npt=now-
 
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m=audio 5432 RTP/AVP 0
 
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c=IN IP4 172.31.0.245
 
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b=AS:63
 
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m=video 5434 RTP/AVP 96
 
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c=IN IP4 172.31.0.245
 
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a=rtpmap:96 H263-2000/90000
 
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a=fmtp:96
 
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a=cliprect:0,0,144,176
 
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a=framesize:96 176-144
 
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* On the N800, pop out the camera and run:
 
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$ ~/bin/rtpstream.sh
 
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assume on PATH, +x etc.
 
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* On Linux box (note VLC runs on other platforms as well):
 
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$ vlc /tmp/n800.sdp
 
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* Enjoy streaming video (and sound) from the N800.
 
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Thanks to [http://web.media.mit.edu/%7Elifton/snippets/n800_to_sl/ Josh Lifton] for the original leg wor
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[[Category:HowTos]]
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[[Category:Midgard wiki]]
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On a N800, to make the image vertically flip automatically when the camera's pointing backwards (so it's not upside-down), change the source name from "v4l2src" to "gconfv4l2src".
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To adjust the video encoding quality, have a look at the parameters described by entering "gst-inspect hantro4200enc" at a shell prompt.  Setting the "bit-rate" parameter to its maximum (515) and the "profile-and-level" parameter to 1007 produces a much better quality image.  Also, I suspect the "stream-type" parameter should be "5" (H263), not "1" (MPEG4 Video).
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== N900 ==
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The instructions for the N900 are very similar to the N800.
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First install gstreamer-tools.
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$ apt-get install gstreamer-tools
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Note: on PC you might need to replace gst-launch by gst-launch-0.10 in the examples below
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To access the back camera use:
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<br>''/dev/video0''
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<br>for the front
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<br>''/dev/video1''
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In the example below the IP for the two devices are as follows
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*PC IP 192.168.1.101
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*N900 IP 192.168.1.105
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On the N900 the command you want to run is:
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$ gst-launch v4l2src device=/dev/video0 ! videoscale! video/x-raw-yuv,width=320,height=240 ! ffmpegcolorspace ! jpegenc ! tcpserversink host=192.168.1.101 port=5000
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On the PC run
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$ gst-launch tcpclientsrc host=192.168.1.105 port=5000  ! jpegdec ! autovideosink
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The below also works
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<br>'''N900'''
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$ gst-launch v4l2camsrc device=/dev/video0 ! videoscale! video/x-raw-yuv,width=320,height=240 ! ffmpegcolorspace ! jpegenc ! tcpserversink host=192.168.1.101 port=5000
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Another example using a different encoder/decoder and udp
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<br>'''N900'''
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$ gst-launch v4l2src device=/dev/video0 ! videoscale ! video/x-raw-yuv,width=320,height=240 ! ffmpegcolorspace ! smokeenc ! udpsink host=192.168.1.101 port=5000
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<br>'''PC'''
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$ gst-launch udpsrc port=5000 ! smokedec ! autovideosink
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Another example using omap3cam driver
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<br>'''N900'''
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$ gst-launch-0.10 v4l2camsrc device=/dev/video0 driver-name=omap3cam ! videoscale ! video/x-raw-yuv,width=320,height=240 ! ffmpegcolorspace ! jpegenc ! tcpserversink host=192.168.1.101 port=5000
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<br>'''PC'''
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$ gst-launch tcpclientsrc host=192.168.1.105 port=5000  ! jpegdec ! autovideosink
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There are many ways to skin this particular cat. Recommendations are to look at [http://www.gstreamer.net/ gstreamer] and familiarise yourself.
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To stream from the N900 to VLC follow these [http://blog.pclewis.com/2010/02/streaming-nokia-n900-camera-to-vlc/ instructions]
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=== For the future ===
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=====vloopback=====
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http://talk.maemo.org/showthread.php?t=26288
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http://tektipsentriks.blogspot.com/2010/05/how-to-install-vloopback-on-ubuntu.html
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===Webcam threads===
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http://talk.maemo.org/showthread.php?t=31567
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http://talk.maemo.org/showthread.php?t=46046
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===Flumotion mention===
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http://talk.maemo.org/showthread.php?t=31567&page=7
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extras-devel
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http://maemo.org/packages/package_instance/view/fremantle_extras-devel_free_i386/flumotion/0.7.0.1-1maemo4/
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== Streaming over ssh N900 ==
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Here is an alternative way of streaming video on the [[Nokia N900|N900]] over ssh.
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First get ssh to do X11 forwarding by installing xauth as follows:
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# Install libxmuu1 (needed by xauth) by "apt-get install libxmuu1"
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# Install the xauth from https://bugs.maemo.org/show_bug.cgi?id=2494
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Now ssh to your N900 with the flag "-X" and then give the command:
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  gst-launch-0.10 v4l2src \
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  ! videoscale ! video/x-raw-yuv,width=320,height=240 \
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  ! xvimagesink
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A 320x240 video window should now popup on your desktop.
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[[Category:Connectivity]]
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[[Category:Media]]
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[[Category:Power users]]
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