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• Video files are not opening for sample applications in Info Sphere Streams

  10 mars 2017, par Pavan Kumar

  I am new to IBM Info Sphere Streams, I read an article which says IBM Info Sphere streams is capable of doing Image processing. After some research I got to know that, we have to install OpenCV and FFMpeg lybraries with its dependecies. I have installed all of them and tried sample applications. I can run applications which contains Images as input, but when it comes to processing with videos it’s not working. I am unable to use x11viewer operator as well. I am getting the following error while working with sample videos.

  (Streams com.ibm.streamsx.opencv::X11Viewer operator:7889): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed
  
  28 Feb 2017 14:00:34.672 [7889] ERROR #splapptrc,J[0],P[0],vid0,spl_pe M[PEImpl.cpp:process:1270]  - CDISR5079E: An exception occurred during the processing of the processing element. The error is: Unable to open camera {0}. 

  I did not install any GPU device drivers here but when I used the following commands I am getting results like below,

  [streamsadmin@streamsqse output]$ lspci | grep VGA
  
  00:0f.0 VGA compatible controller: VMware SVGA II Adapter
  
  
  
  [streamsadmin@streamsqse output]$ find /dev -group video
  
  /dev/fb0
  
  /dev/dri/card0
  
  /dev/dri/renderD128
  
  /dev/dri/controlD64
  
  /dev/agpgart

  and

  glxinfo | grep -i vendor
  
  server glx vendor string: SGI
  
  client glx vendor string: Mesa Project and SGI
  
  OpenGL vendor string: VMware, Inc

  My doubt here is, whether I have installed GPU Drivers properly or do I need to install them again ? Can anyone help me to resolve this issue.

  And I am unable to open those videos by using any player as well.

• FFMPEG to both save a file and stream to MPLayer on a different computer

  8 octobre 2016, par Laurent Bazinet

  Here’s what i’m trying to do : Have a raspberry pi grab a video with a camera, using raspivid and pipe this directly to my main computer, which would act as a kind of server, by both saving the video, and allowing a live stream using MPlayer to be displayed by another computer on the network.

  My problem is only on the last part : display the stream on another computer.

  For clarity, Main computer is going to be Comp-A, and the computer running MPlayer will be Comp-X (because this can be any computer on my network, or even outside my network)

  If we follow the information, here’s how i’ve done it so far : Grab the video and pipe it to the network (this is done on the raspberry pi)

  raspivid -t 0 -w 1280 -h 720 -a 12 -ih -v -fps 30 -n -o - | sudo nc -k -w 1 -l 80

  This works great for my purpose.

  Next, on Comp-A, I’m grabbing this stream with FFMPEG, and tee-ing to both a file and a UDP stream using this command :

  ffmpeg -i tcp://raspberryIP:80 -c:v h264 -f tee -map 0:v "[f=stream_segment:segment_wrap=25:segment_time=3600:reset_timestamps=1]output%%03d.mp4|[f=mpegts]udp://maincomputerIP:80"

  (side note, the [f=stream_segment:segment_wrap=25:segment_time=3600:reset_timestamps=1] is to have 25 videos of 1 hour long, and looping)

  Then I run into issues.

  If I run this on Comp-A :
  mplayer -fps 200 -demuxer mpegts "udp://Comp-A-IP:80"
  It works great.

  If I run the same command on Comp-X, it doesn’t work.

  If I change the [f=mpegts]udp://Comp-A-IP:80" to [f=mpegts]udp://Comp-X-IP:80", then the Comp-X works, but the Comp-A doesn’t anymore.

  This leads me to believe my issue is that the UDP url from FFMPEG is asking for the computer it’s going to connect to, not the host computer.

  My problem is that Comp-X’s IP is unknown.

  Is there a way ? Maybe I’m over-complicating things. I don’t know.

• Raspberry Pi USB Webcam Stream to Computer using Gstreamer

  17 mars 2016, par James

  I have a fisheye usb webcam attached to a raspberry pi that I’m trying to stream to a computer. I’ve played with ffmpeg and it seems a little laggy beyond 320x240. From what I’ve read people have been happy with gstreamer.

  So I’ve tested the usb webcam and it works locally

  gst-launch-1.0 -v v4l2src device=/dev/video0 ! 'video/x-raw,width=640,height=480' ! glimagesink

  These are the commands I’ve been trying to use to get the video to my computer. However, all I’m seeing is a green window.

  TCP Sever :gst-launch-1.0 -v v4l2src device=/dev/video0 ! 'video/x-raw,width=640,height=480,framerate=30/1' ! x264enc byte-stream=true ! rtph264pay ! gdppay ! tcpserversink host=192.168.200.38 port=5000 sync=false

  TCP Client : gst-launch-1.0 -v tcpclientsrc host=192.168.200.38 port=5000  ! gdpdepay !  rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false

  or

  UDP Server :
  gst-launch-1.0 -v v4l2src device=/dev/video0 ! 'video/x-raw,width=640,height=480,framerate=30/1' ! x264enc byte-stream=true  ! rtph264pay ! gdppay ! udpsink host=192.168.200.37 port=5000 sync=false

  UDP Client :
  gst-launch-1.0 -v udpsrc port=5000  ! gdpdepay !  rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false

  I figure I must be piping the plugins wrong somehow. Any advice is appreciated.