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• GStreamer x264 on Linux (ARM)

  8 septembre 2017, par Tõnu Samuel

  Trying to get streaming work with x264 encoding.

  I am doing some black magic with stitching two images which is known to work :

  gst-launch-1.0 -e \
  
      v4l2src device=/dev/video0 ! \
  
          video/x-raw,framerate=90/1,width=640,height=480 ! m.sink_0 \
  
      v4l2src device=/dev/video1 ! \
  
          video/x-raw,framerate=90/1,width=640,height=480 ! m.sink_1 \
  
      videomixer name=m sink_1::xpos=640 ! \
  
      video/x-raw,framerate=90/1,width=1280,height=480 ! \
  
      xvimagesink

  Now I am trying to get same thing over x264 stream with help of internet :

  gst-launch-1.0 -e \
  
      v4l2src device=/dev/video0 ! \
  
          video/x-raw,framerate=90/1,width=640,height=480 ! m.sink_0 \
  
      v4l2src device=/dev/video1 ! \
  
          video/x-raw,framerate=90/1,width=640,height=480 ! m.sink_1 \
  
      videomixer name=m sink_1::xpos=640 ! \
  
      video/x-raw,framerate=90/1,width=1280,height=480 ! \
  
      x264enc tune=zerolatency byte-stream=true bitrate=3000 threads=2 ! \
  
      h264parse config-interval=1 ! \
  
      rtph264pay ! \
  
      udpsink host=127.0.0.1 port=5000 

  And seems to work because no errors appear. But I see no way to receive image.

  I have tried

  gst-launch-1.0 udpsrc port=5000 ! application/x-rtp ! rtph264depay ! h264parse ! avdec_h264 ! xvimagesink

  which does not provide anything useful. Also attempted to use VLC with SDP file :

  c=IN IP4 127.0.0.1
  
  m=video 5000 RTP/AVP 96
  
  a=rtpmap:96 H264/3000

  I must be doing something wrong but unsure what.

  EDIT : Question about version of GStreamer. Probably this is information needed :

  ubuntu@tegra-ubuntu:~$  gst-launch-1.0 --version
  
  gst-launch-1.0 version 1.2.4
  
  GStreamer 1.2.4
  
  https://launchpad.net/distros/ubuntu/+source/gstreamer1.0
  
  ubuntu@tegra-ubuntu:~$
  
  
  
  
  
  
  
  $ dpkg -l | grep gstreamer
  
  ii  gir1.2-gstreamer-1.0                                  1.2.4-0ubuntu1.1                                    armhf        Description: GObject introspection data for the GStreamer library
  
  ii  gstreamer-tools                                       0.10.36-1.2ubuntu3                                  armhf        Tools for use with GStreamer
  
  ii  gstreamer0.10-alsa:armhf                              0.10.36-1.1ubuntu2                                  armhf        GStreamer plugin for ALSA
  
  ii  gstreamer0.10-fluendo-mp3:armhf                       0.10.23.debian-3                                    armhf        Fluendo mp3 decoder GStreamer 0.10 plugin
  
  ii  gstreamer0.10-nice:armhf                              0.1.4-1                                             armhf        ICE library (GStreamer 0.10 plugin)
  
  ii  gstreamer0.10-plugins-bad:armhf                       0.10.23-7.2ubuntu1.3                                armhf        GStreamer plugins from the "bad" set
  
  ii  gstreamer0.10-plugins-bad-multiverse                  0.10.21-1ubuntu3                                    armhf        GStreamer plugins from the "bad" set (Multiverse Variant)
  
  ii  gstreamer0.10-plugins-base:armhf                      0.10.36-1.1ubuntu2                                  armhf        GStreamer plugins from the "base" set
  
  ii  gstreamer0.10-plugins-base-apps                       0.10.36-1.1ubuntu2                                  armhf        GStreamer helper programs from the "base" set
  
  ii  gstreamer0.10-plugins-good:armhf                      0.10.31-3+nmu1ubuntu5.2                             armhf        GStreamer plugins from the "good" set
  
  ii  gstreamer0.10-plugins-ugly:armhf                      0.10.19-2ubuntu5                                    armhf        GStreamer plugins from the "ugly" set
  
  ii  gstreamer0.10-pulseaudio:armhf                        0.10.31-3+nmu1ubuntu5.2                             armhf        GStreamer plugin for PulseAudio
  
  ii  gstreamer0.10-tools                                   0.10.36-1.2ubuntu3                                  armhf        Tools for use with GStreamer
  
  ii  gstreamer0.10-x:armhf                                 0.10.36-1.1ubuntu2                                  armhf        GStreamer plugins for X11 and Pango
  
  ii  gstreamer1.0-alsa:armhf                               1.2.4-1~ubuntu2                                     armhf        GStreamer plugin for ALSA
  
  ii  gstreamer1.0-clutter                                  2.0.8-1build1                                       armhf        Clutter PLugin for GStreamer 1.0
  
  ii  gstreamer1.0-fluendo-mp3:armhf                        0.10.23.debian-3                                    armhf        Fluendo mp3 decoder GStreamer 1.0 plugin
  
  ii  gstreamer1.0-libav:armhf                              1.2.4-1~ubuntu1                                     armhf        libav plugin for GStreamer
  
  ii  gstreamer1.0-nice:armhf                               0.1.4-1                                             armhf        ICE library (GStreamer plugin)
  
  ii  gstreamer1.0-plugins-bad:armhf                        1.2.4-1~ubuntu1.1                                   armhf        GStreamer plugins from the "bad" set
  
  ii  gstreamer1.0-plugins-bad-faad:armhf                   1.2.4-1~ubuntu1.1                                   armhf        GStreamer faad plugin from the "bad" set
  
  ii  gstreamer1.0-plugins-bad-videoparsers:armhf           1.2.4-1~ubuntu1.1                                   armhf        GStreamer videoparsers plugin from the "bad" set
  
  ii  gstreamer1.0-plugins-base:armhf                       1.2.4-1~ubuntu2                                     armhf        GStreamer plugins from the "base" set
  
  ii  gstreamer1.0-plugins-base-apps                        1.2.4-1~ubuntu2                                     armhf        GStreamer helper programs from the "base" set
  
  ii  gstreamer1.0-plugins-good:armhf                       1.2.4-1~ubuntu1.3                                   armhf        GStreamer plugins from the "good" set
  
  ii  gstreamer1.0-plugins-ugly:armhf                       1.2.3-2build1                                       armhf        GStreamer plugins from the "ugly" set
  
  ii  gstreamer1.0-pulseaudio:armhf                         1.2.4-1~ubuntu1.3                                   armhf        GStreamer plugin for PulseAudio
  
  ii  gstreamer1.0-tools                                    1.2.4-0ubuntu1.1                                    armhf        Tools for use with GStreamer
  
  ii  gstreamer1.0-x:armhf                                  1.2.4-1~ubuntu2                                     armhf        GStreamer plugins for X11 and Pango
  
  ii  libgstreamer-plugins-bad0.10-0:armhf                  0.10.23-7.2ubuntu1.3                                armhf        GStreamer shared libraries from the "bad" set
  
  ii  libgstreamer-plugins-bad1.0-0:armhf                   1.2.4-1~ubuntu1.1                                   armhf        GStreamer development files for libraries from the "bad" set
  
  ii  libgstreamer-plugins-base0.10-0:armhf                 0.10.36-1.1ubuntu2                                  armhf        GStreamer libraries from the "base" set
  
  ii  libgstreamer-plugins-base1.0-0:armhf                  1.2.4-1~ubuntu2                                     armhf        GStreamer libraries from the "base" set
  
  ii  libgstreamer-plugins-good1.0-0:armhf                  1.2.4-1~ubuntu1.3                                   armhf        GStreamer development files for libraries from the "good" set
  
  ii  libgstreamer0.10-0:armhf                              0.10.36-1.2ubuntu3                                  armhf        Core GStreamer libraries and elements
  
  ii  libgstreamer1.0-0:armhf                               1.2.4-0ubuntu1.1                                    armhf        Core GStreamer libraries and elements
  
  $ 

• python cv2 BackgroundSubtractor imshow function error

  16 septembre 2017, par Vincent Yuan

  problem

  I want to detect the motional object in a video, but the cap seems not to read the video. I use conda jupyter and have install the ffmpeg with brew and I use macOS. Still, I am unable to capture the video.

  code :

  import numpy as np
  
  import cv2
  
  import time
  
  
  
  cap = cv2.VideoCapture('test.avi')
  
  time.sleep(2)
  
  fgbg = cv2.createBackgroundSubtractorKNN(detectShadows=True)
  
  
  
  while(1):
  
  ret, frame = cap.read()
  
  
  
  fgmask = fgbg.apply(frame)
  
  
  
  cv2.imshow('original',frame)
  
  cv2.imshow('fg',fgmask)
  
  
  
  k = cv2.waitKey(30) & 0xff
  
  for c in contours:
  
          # 获取矩形框边界坐标
  
          x, y, w, h = cv2.boundingRect(c)
  
          # 计算矩形框的面积
  
          area = cv2.contourArea(c)
  
          if 500 < area < 3000:
  
              cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 2)
  
  
  
  cv2.imshow("detection", frame)
  
  cv2.imshow("back", dilated)
  
  
  
  
  
  if k == 27:
  
      break
  
  
  
  
  
  cap.release()
  
  cv2.destroyAllWindows()

  error

  Couldn’t read video stream from file "test.avi"

• ffmpeg with nginx rtmp multiple udp not streaming well

  16 septembre 2017, par Dlniya Dlzar

  I am using ffmpeg for live streaming via nginx rtmp , i am streaming 20 streams for each server (UDP to rtmp) i wrote small python script to loop
  through each streams and run following command for each stream, but each time i start streaming some of the streams not working , i mean ffmpeg not send to nginx , if i use (http to rtmp or rtmp to rtmp etc) everything is working fine just when i use (udp to rtmp) this problem happen , please advice . sorry for bad English : this is my command

  ffmpeg -i udp://localhost:3000 -filter_complex 
  
  [0]yadif[main];movie=/root/ftc/logo/logo3.png[logo];[main]
  
  [logo]overlay=650:10" -c:a aac -ac 1 -strict -2 -c:v libx264 -maxrate 2000k 
  
  -bufsize 2000k -g 40 -r 23 -preset ultrafast -threads 1 -f flv 
  
  rtmp://localhost:3000/live/stream1 null >/dev/null 
  
  2>/var/log/ffmpeg.log &