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• Gstreamer pipeline to scale down video before streaming

  20 novembre 2014, par r3dsm0k3

  Here is what Im trying to achieve.

  Im streaming from a Logitech C920 camera on beaglebone black with gstreamer. I have to save a copy of the video saved locally while it is streaming. I have achieved that with tee.
  Logitech camera gives h264 encoded video at a certain bitrate, mostly very high.

  Im streaming from a moving car on 3G, and the network is not good enough to send the stream to nginx-rtmp server Im using to re-distribute thus gives strong artifacts in the result.

  Im able to alter the bitrate of captured video using uvch264.
  But then, the locally saved video also would have lower bitrate.

  Is there anyway of capturing a higher bitrate 1080p video from the camera and sending a lower resolution, lower bitrate video the streaming server ?

  Following is the pipeline I have currently.

  gst-launch-1.0 -v -e uvch264src initial-bitrate=400000 average-bitrate=400000 iframe-period=3000  device=/dev/video0 name=src auto-start=true  src.vidsrc ! queue ! video/x-h264,width=1920,height=1080,framerate=30/1 ! h264parse ! flvmux streamable=true  name=flvmuxer ! queue ! tee name=t ! queue ! filesink location=/mnt/test.flv t. ! queue ! rtmpsink location=$SERVER/hls/$CAM1

  I could also try sending the higher bitrate video to a udpsink instead of rtmpsink and with another gstreamer process parallely and takes the data using a udpsink and probably post process/ re-encode and send to rtmp server.

  Im also limited by the processing speed BeagleBone has to do for encoding the videos. Currently Im trying for 1 camera and in the finished project I would like to have 2 cameras connected. Upload speed Im getting for the network is under 1Mbps.

  How do I solve this with less load on the BeagleBone ? Im very open to a new architecture as well.

• How to convert an IP Camera video stream into a video file ?

  14 novembre 2014, par AgentFire

  I have a URL (<ip>/ipcam/mpeg4.cgi</ip>) which points to my IP camera which is connected via Ethernet.
  Accessing the URL resuls in a infinite stream of video (possibly with audio) data.

  I would like to store this data into a video file and play it later with a video player (HTML5’s video tag is preferred as the player).

  However, a straightforward approach, which is simple saving the stream data into .mp4 file, didn’t work.

  I have looked into the file and here is what I saw (click to enlarge) :

  

  It turned out, there are some HTML headers, which I further on manually excluded using the binary editing tool, and yet no player could play the rest of the file.

  The HTML headers are :

  --myboundary
  
  Content-Type: image/mpeg4
  
  Content-Length: 76241
  
  X-Status: 0
  
  X-Tag: 1693923
  
  X-Flags: 0
  
  X-Alarm: 0
  
  X-Frametype: I
  
  X-Framerate: 30
  
  X-Resolution: 1920*1080
  
  X-Audio: 1
  
  X-Time: 2000-02-03 02:46:31
  
  alarm: 0000

  My question is pretty clear now, and I would like any help or suggestion. I suspect, I have to manually create some MP4 headers myself based on those values above, however, I fail to understand format descriptions such as these.

  I have the following video stream settings on my IP camera (click to enlarge) :

  

  I could also use the ffmpeg tool, but no matter how I try and mix the arguments to the program, it keeps telling me this error :

  

• How to play a part of the MP4 video stream ?

  14 novembre 2014, par AgentFire

  I have a URL (<ip>/ipcam/mpeg4.cgi</ip>) which points to my IP camera which is connected via Ethernet.
  Accessing the URL resuls in a infinite stream of video (possibly with audio) data.

  I would like to store this data into a video file and play it later with a video player (HTML5’s video tag is preferred as the player).

  However, a straightforward approach, which is simple saving the stream data into .mp4 file, didn’t work.

  I have looked into the file and here is what I saw (click to enlarge) :

  

  It turned out, there are some HTML headers, which I further on manually excluded using the binary editing tool, and yet no player could play the rest of the file.

  The HTML headers are :

  --myboundary
  
  Content-Type: image/mpeg4
  
  Content-Length: 76241
  
  X-Status: 0
  
  X-Tag: 1693923
  
  X-Flags: 0
  
  X-Alarm: 0
  
  X-Frametype: I
  
  X-Framerate: 30
  
  X-Resolution: 1920*1080
  
  X-Audio: 1
  
  X-Time: 2000-02-03 02:46:31
  
  alarm: 0000

  My question is pretty clear now, and I would like any help or suggestion. I suspect, I have to manually create some MP4 headers myself based on those values above, however, I fail to understand format descriptions such as these.

  I have the following video stream settings on my IP camera (click to enlarge) :

  

  I could also use the ffmpeg tool, but no matter how I try and mix the arguments to the program, it keeps telling me this error :