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• Cannot duplicate virtual camera on Orange Pi 5B [closed]

  21 janvier 2024, par Denis Kotov

  I have faced with the issue that I cannot duplicate virtual camera for SkyDroid 5.8GHz OTG Receiver on Orange Pi 5B :

  


  orangepi@orangepi-desktop:~$ gst-launch-1.0 v4l2src device=/dev/video0 ! xvimagesink device=/dev/video2

Setting pipeline to PAUSED ...
ERROR: from element /GstPipeline:pipeline0/GstXvImageSink:xvimagesink0: Could not initialise Xv output
Additional debug info:
../sys/xvimage/xvimagesink.c(1806): gst_xv_image_sink_open (): /GstPipeline:pipeline0/GstXvImageSink:xvimagesink0:
Could not open display (null)
ERROR: pipeline doesn't want to preroll.
Failed to set pipeline to PAUSED.
Setting pipeline to NULL ...
Freeing pipeline ...

orangepi@orangepi-desktop:~$ gst-launch-1.0 v4l2src device=/dev/video0 ! v4l2sink device=/dev/video2

Setting pipeline to PAUSED ...
ERROR: from element /GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0: Cannot identify device '/dev/video2'.
Additional debug info:
../sys/v4l2/v4l2_calls.c(608): gst_v4l2_open (): /GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0:
system error: No such file or directory
ERROR: pipeline doesn't want to preroll.
Failed to set pipeline to PAUSED.
Setting pipeline to NULL ...
Freeing pipeline ...


  


  Also I tried to duplicate video camera using ffmpeg :

  


  orangepi@orangepi-desktop:~$ sudo ffmpeg -f video4linux2 -i /dev/video0 -codec copy -f v4l2 /dev/video2

ffmpeg version 6.0-5+git230804.e243e8d001~j1 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 11 (Ubuntu 11.4.0-1ubuntu1~22.04)
  configuration: --prefix=/usr --extra-version='5+git230804.e243e8d001~j1' --toolchain=hardened --libdir=/usr/lib/aarch64-linux-gnu --incdir=/usr/include/aarch64-linux-gnu --arch=arm64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-version3 --enable-rkmpp --enable-sdl2 --disable-sndio --enable-pocketsphinx --enable-librsvg --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-libplacebo --enable-shared
  libavutil      58.  2.100 / 58.  2.100
  libavcodec     60.  3.100 / 60.  3.100
  libavformat    60.  3.100 / 60.  3.100
  libavdevice    60.  1.100 / 60.  1.100
  libavfilter     9.  3.100 /  9.  3.100
  libswscale      7.  1.100 /  7.  1.100
  libswresample   4. 10.100 /  4. 10.100
  libpostproc    57.  1.100 / 57.  1.100
[mjpeg @ 0xaaab04104190] EOI missing, emulating
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 3317.330868, bitrate: N/A
  Stream #0:0: Video: mjpeg (Baseline), yuvj422p(pc, bt470bg/unknown/unknown), 640x480, 30 fps, 30 tbr, 1000k tbn
[video4linux2,v4l2 @ 0xaaab04105750] Unable to open V4L2 device '/dev/video2'
[out#0/video4linux2,v4l2 @ 0xaaab040b9200] Could not write header (incorrect codec parameters ?): No such file or directory
[vost#0:0/copy @ 0xaaab04107640] Error initializing output stream: 
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
    Last message repeated 1 times
[video4linux2,v4l2 @ 0xaaab041039d0] Some buffers are still owned by the caller on close.
ioctl(VIDIOC_QBUF): Bad file descriptor


  


  But it also did not work ...

  


  The reason I want it, because I try to have additional processing using OpenCV but the camera is opened by another application, and it is not possible to similtuniuously open camera in 2 applications at the same time ...

  


  Have somebody faced with similar issue ?

  


• how can I pipe gstreamer output to ffmpeg [closed]

  11 décembre 2019, par alex jef

  how can I pipe GStreamer output to FFmpeg ?
  I have already tried some, none of them are working, e.g :

  gst-launch-1.0 -e -v  videotestsrc  ! video/x-raw, width=1920, height=1080, framerate=5/1, format=NV12  ! filesink location=/dev/stdout  | ffmpeg -i pipe:0 ao.avi
  
  ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  pipe:0: Invalid data found when processing input

  any help would be appreciated.

• Gstreamer Multiple Source with Single Sink Implementation in PythonGST

  11 octobre 2018, par biswajitGhosh

  I’m new to Gstreamer as well as Python-GST also. I have to collect multiple source raw video stream data into a single sink, I don’t know, if it is possible or not.

  Lets explain more my scenario :

  I have 2 video source server for now, one is my webcam and another is just an mp4 file, I did open those source using following command

  Source1 :

  gst-launch-1.0 v4l2src device=/dev/video0 !
  ’video/x-raw,width=640,height=480’ ! x264enc pass=qual quantizer=20
  tune=zerolatency ! rtph264pay ! udpsink host=127.0.0.1 port=5000

  Source2 :

  gst-launch-1.0 filesrc location = file_name.mp4 !
  ’video/x-raw,width=640,height=480’ ! x264enc pass=qual quantizer=20
  tune=zerolatency ! rtph264pay ! udpsink host=127.0.0.1 port=5000

  I’m trying to send both stream data to localhost 5000 port after encoding with H264.

  For receiving I have a Python Sink Server like this :

  import gi
  
  gi.require_version('Gst', '1.0')
  
  gi.require_version('GstApp', '1.0')
  
  from gi.repository import GObject, Gst, GstApp
  
  
  
  GObject.threads_init()
  
  Gst.init(None)
  
  GST_DEBUG="6"
  
  
  
  class Example:
  
      def __init__(self):
  
          self.mainloop   = GObject.MainLoop()
  
          self.pipeline   = Gst.Pipeline.new("Pipeline") 
  
          self.bus        = self.pipeline.get_bus()
  
          self.bus.add_signal_watch()
  
          self.bus.connect("message", self.on_message)
  
          # self.bus.connect('message::eos', self.on_eos)
  
          # self.bus.connect('message::error', self.on_error)
  
          # self.bus.connect("sync-message::element", self.on_sync_message)
  
  
  
          #Create QUEUE elements
  
          self.queue1     = Gst.ElementFactory.make("queue",          None)
  
          self.queue2     = Gst.ElementFactory.make("queue",          None)
  
  
  
          # Create the elements
  
          self.source     = Gst.ElementFactory.make("udpsrc",         None)
  
          self.depay      = Gst.ElementFactory.make("rtph264depay",   None)
  
          self.parser     = Gst.ElementFactory.make("h264parse",      None)
  
          self.decoder    = Gst.ElementFactory.make("avdec_h264",     None)
  
          self.sink       = Gst.ElementFactory.make("appsink",        None)
  
  
  
          # Add elements to pipeline
  
          self.pipeline.add(self.source)
  
          self.pipeline.add(self.queue1)
  
          self.pipeline.add(self.depay)
  
          self.pipeline.add(self.parser)
  
          self.pipeline.add(self.decoder)
  
          self.pipeline.add(self.queue2)
  
          self.pipeline.add(self.sink)
  
  
  
          # Set properties
  
          self.source.set_property('port', 5000)
  
          self.source.set_property('caps', Gst.caps_from_string("application/x-rtp, encoding-name=H264,payload=96"))
  
          self.sink.set_property('emit-signals', True)
  
          # turns off sync to make decoding as fast as possible
  
          self.sink.set_property('sync', False)
  
          self.sink.connect('new-sample', self.on_new_buffer, self.sink)
  
  
  
  
  
  
  
  
  
      def on_new_buffer(self, appsink, data):
  
          print "exec two..."
  
          appsink_sample = GstApp.AppSink.pull_sample(self.sink)
  
          # with open('example.h264', 'a+') as streamer:
  
          buff = appsink_sample.get_buffer()
  
          size, offset, maxsize = buff.get_sizes()
  
          frame_data = buff.extract_dup(offset, size)
  
          print(size)
  
          # flag, info = buff.map(Gst.MapFlags.READ)
  
          # streamer.write(info.data)
  
          # print(info.size)
  
          return False
  
  
  
      def run(self):
  
          ret = self.pipeline.set_state(Gst.State.PLAYING)        
  
          if ret == Gst.StateChangeReturn.FAILURE:
  
              print("Unable to set the pipeline to the playing state.")
  
              exit(-1)
  
  
  
          self.mainloop.run()
  
  
  
      def kill(self):
  
          self.pipeline.set_state(Gst.State.NULL)
  
          self.mainloop.quit()
  
  
  
      def on_eos(self, bus, msg):
  
          print('on_eos()')
  
          self.kill()
  
  
  
      def on_error(self, bus, msg):
  
          print('on_error():', msg.parse_error())
  
          self.kill()
  
  
  
      def on_message(self, bus, message):
  
          t = message.type
  
          if t == Gst.MessageType.EOS:
  
              print "End of Stream :("
  
              self.kill()
  
          elif t == Gst.MessageType.ERROR:
  
              err, debug = message.parse_error()
  
              print "Error: %s" % err, debug
  
              self.kill()
  
  
  
  
  
      def on_sync_message(self, bus, message):
  
          print message.src
  
  
  
  
  
  example = Example()
  
  example.run()

  Firstly AppSink callback does not working, I don’t know why ? I think I have to make that configuration correct into Python Code. Can any one please help to figure it out ?

  Secondly when I tried with FFMpeg and FFPlay I got so many H264 encoding issues like this :

  

  Main confusion is Can GStreamer handle Multiple Source data into a single sink(I need to distinguished each video frame).

  Thanks a lot.