Editing Streaming video from built-in webcam

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It is possible to use the [[Nokia N800|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 from working.

This note describes how to stream video from the platform to an RTP sink, for example the [[VLC]] media player.

First, you must install the '''gstreamer-tools''' package from the diablo repo on repository.maemo.org.

* 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>.
 #!/bin/sh
 VPORT=5434
 APORT=5432
 HOST=${1:-172.31.0.244}
 gst-launch-0.10 v4l2src ! video/x-raw-yuv,width=176,height=144,framerate=$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

* 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>
 v=0
 o=- 37 614155991 IN IP4 127.0.0.0
 s=QuickTime
 t=0 0
 a=range:npt=now-
 m=audio 5432 RTP/AVP 0
 c=IN IP4 172.31.0.245
 b=AS:63
 m=video 5434 RTP/AVP 96
 c=IN IP4 172.31.0.245
 a=rtpmap:96 H263-2000/90000
 a=fmtp:96
 a=cliprect:0,0,144,176
 a=framesize:96 176-144
* On the N800, pop out the camera and run:
 $ ~/bin/rtpstream.sh 
assume on PATH, +x etc.
* On Linux box (note VLC runs on other platforms as well):
 $ vlc /tmp/n800.sdp
* Enjoy streaming video (and sound) from the N800.

Thanks to [http://web.media.mit.edu/%7Elifton/snippets/n800_to_sl/ Josh Lifton] for the original leg wor

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".

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).

== Streaming over ssh N900 ==

Here is an alternative way of streaming video on the [[Nokia N900|N900]] over ssh.

First get ssh to do X11 forwarding by installing xauth as follows:

# Install libxmuu1 (needed by xauth) by "apt-get install libxmuu1"
# Install the xauth from https://bugs.maemo.org/show_bug.cgi?id=2494

Now ssh to your N900 with the flag "-X" and then give the command:

gst-launch-0.10 v4l2src \!videoscale \!video/x-raw-yuv,width=320,height=240 \
    \! xvimagesink

A 320x240 video window should now popup on your desktop.

[[Category:Connectivity]]
[[Category:Media]]
[[Category:Power users]]

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Retrieved from "http://wiki.maemo.org/Streaming_video_from_built-in_webcam"

@@ Line 1: / Line 1: @@
-It is possible to use the [[Nokia N800|N800]] and [[Nokia N900|N900]] camera as a source of streaming video.
+It is possible to use the [[Nokia N800|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 from working.
-== N800 ==
-This was originally described [https://maemo.org/community/wiki/howtostreamvideo/ here], but the referenced example has an error which prevents it from working.
 This note describes how to stream video from the platform to an RTP sink, for example the [[VLC]] media player.
@@ Line 44: / Line 40: @@
 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).
-== N900 ==
-The instructions for the N900 are very similar to the N800.
-First install gstreamer-tools.
-$ apt-get install gstreamer-tools
-Note: on PC you might need to replace gst-launch by gst-launch-0.10 in the examples below
-To access the back camera use:
-<br>''/dev/video0''
-<br>for the front
-<br>''/dev/video1''
-In the example below the IP for the two devices are as follows
-*PC IP 192.168.1.101
-*N900 IP 192.168.1.105
-On the N900 the command you want to run is:
- $ 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
-On the PC run
- $ gst-launch tcpclientsrc host=192.168.1.105 port=5000  ! jpegdec ! autovideosink
-The below also works
-<br>'''N900'''
- $ 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
-Another example using a different encoder/decoder and udp
-<br>'''N900'''
- $ 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
-<br>'''PC'''
- $ gst-launch udpsrc port=5000 ! smokedec ! autovideosink
-Another example using omap3cam driver
-<br>'''N900'''
- $ 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
-<br>'''PC'''
- $ gst-launch tcpclientsrc host=192.168.1.105 port=5000  ! jpegdec ! autovideosink
-There are many ways to skin this particular cat. Recommendations are to look at [http://www.gstreamer.net/ gstreamer] and familiarise yourself.
-To stream from the N900 to VLC follow these [http://blog.pclewis.com/2010/02/streaming-nokia-n900-camera-to-vlc/ instructions]
-=== For the future ===
-=====vloopback=====
-http://talk.maemo.org/showthread.php?t=26288
-http://tektipsentriks.blogspot.com/2010/05/how-to-install-vloopback-on-ubuntu.html
-===Webcam threads===
-http://talk.maemo.org/showthread.php?t=31567
-http://talk.maemo.org/showthread.php?t=46046
-===Flumotion mention===
-http://talk.maemo.org/showthread.php?t=31567&page=7
-extras-devel
-http://maemo.org/packages/package_instance/view/fremantle_extras-devel_free_i386/flumotion/0.7.0.1-1maemo4/
 == Streaming over ssh N900 ==
@@ Line 129: / Line 52: @@
 Now ssh to your N900 with the flag "-X" and then give the command:
-   gst-launch-0.10 v4l2src \
+   gst-launch-0.10 v4l2src \!videoscale \!video/x-raw-yuv,width=320,height=240 \
-  ! videoscale ! video/x-raw-yuv,width=320,height=240 \
+    \! xvimagesink
-  ! xvimagesink
 A 320x240 video window should now popup on your desktop.

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Editing Streaming video from built-in webcam