Sur d’autres sites (10342)

• How can I correctly provide a fake webcam input to Chrome ?

  30 août 2018, par doppelgreener

  I’m trying to run end-to-end testing in Chrome for a product that requires a webcam feed halfway through to operate. From what I understand this means providing a fake webcam video to Chrome using the --use-file-for-fake-video-capture="/path/to/video.y4m" command line argument. It will then use that as a webcam video.

  However, no matter what y4m file I provide, I get the following error from Chrome running under these conditions :

  DOMException: Could not start video source
  
  {
  
    code: 0,
  
    message: "Could not start video source",
  
    name: "NotReadableError"
  
  }

  Notably I can provide an audio file just fine using --use-file-for-fake-audio-capture and Chrome will work with it well. The video has been my sticking point.

  This error comes out of the following straightforward mediaDevices request :

  navigator.mediaDevices.getUserMedia({ video: true, audio: true })
  
    .then(data => {
  
      // do stuff
  
    })
  
    .catch(err => {
  
      // oh no!
  
    });

  (This always hits the “oh no !” branch when a video file is provided.)

  What I’ve tried so far

  I’ve been running Chrome with the following command line arguments (newlines added for readability), and I’m using a Mac hence the open command :

  open -a "Google Chrome" --args
  
    --disable-gpu
  
    --use-fake-device-for-media-stream
  
    --use-file-for-fake-video-capture="~/Documents/mock/webcam.y4m"
  
    --use-file-for-fake-audio-capture="~/Documents/mock/microphone.wav"

  webcam.y4m and microphone.wav were generated from a video file I recorded.

  I first recorded a twenty-second mp4 video using my browser’s MediaRecorder, downloaded the result, and converted it using the following command line commands :

  ffmpeg -y -i original.mp4 -f wav -vn microphone.wav
  
  ffmpeg -y -i original.mp4 webcam.y4m

  When this didn’t work, I tried the same using a twenty-second movie file I recorded in Quicktime :

  ffmpeg -y -i original.mov -f wav -vn microphone.wav
  
  ffmpeg -y -i original.mov webcam.y4m

  When that also failed, I went straight to the Chromium file that explains fake video capture, went to the example y4m file list it provided, and downloaded the grandma file and provided that as a command line argument to Chrome instead :

  open -a "Google Chrome" --args
  
    --disable-gpu
  
    --use-fake-device-for-media-stream
  
    --use-file-for-fake-video-capture="~/Documents/mock/grandma_qcif.y4m"
  
    --use-file-for-fake-audio-capture="~/Documents/mock/microphone.wav"

  Chrome provides me with the exact same error in all of these situations.

  The only time Chrome doesn’t error out with that mediaDevices request is when I omit the video completely :

  open -a "Google Chrome" --args
  
    --disable-gpu
  
    --use-fake-device-for-media-stream
  
    --use-file-for-fake-audio-capture="~/Documents/mock/microphone.wav"

  Accounting for C420mpeg2

  TestRTC suggests Chrome will “crash” if I give it a C420mpeg2 file, and recommends that simply replacing the metadata fixes the issue. Indeed the video file I generate from ffmpeg gives me the following header :

  YUV4MPEG2 W1280 H720 F30:1 Ip A1:1 C420mpeg2 XYSCSS=420MPEG2

  Chrome doesn’t actually crash when run with this file, I just get the error above. If I edit the video file to the following header though per TestRTC’s recommendations I get the same situation :

  YUV4MPEG2 W1280 H720 F30:1 Ip A1:1 C420 XYSCSS=420MPEG2

  The video file still gives me the above error in these conditions.

  What can/should I do ?

  How should I be providing a video file to Chrome for this command line argument ?

  How should I be recording or creating the video file ?

  How should I convert it to y4m ?

• Send stream from hdhomerun to AWS EC2 instance

  13 novembre 2018, par icalvete

  I’m trying something odd to get fun. Send stream from hdhomerun to AWS EC2 instance.

  First aproach. Read stream with ffmpeg
  (tested locally successfully)

  hdhomerun_config discover sya my device have ip 192.168.1.200 so I open port on my router in this way

  <my home="home" public="public" ip="ip">:5005 -> 192.168.1.200:80
  
  <my home="home" public="public" ip="ip">:5004 -> 192.168.1.200:5004
  
  </my></my>

  w3m and telnet say everything is ok.

  But...

  from EC2 instance I do

  /usr/bin/ffmpeg -y -i 'http://<my home="home" public="public" ip="ip">:5004/auto/v5057?transcode=internet240' -t 12 -vn -acodec pcm_s16le -ar 16000 -ac 1 '/tmp/test.wav'
  
  </my>

  In tuner1 I can see...

  Virtual Channel none
  
  Frequency   698.000 MHz
  
  Program Number  186
  
  Modulation Lock t8qam64
  
  Signal Strength 89%
  
  Signal Quality  100%
  
  Symbol Quality  100%
  
  Streaming Rate  none
  
  Resource Lock   <ec2 public="public" ip="ip">
  
  </ec2>

  In hdhomerun system logs...

  19700102-10:27:25 Tuner: tuner0 tuning 5057 Telecinco (t8qam64:698MHz-186)
  
  19700102-10:27:25 Tuner: tuner0 streaming http to <ec2 public="public" ip="ip">:34124
  
  </ec2>

  Everything seems ok but ffmpeg don’t get any data.

  Seccond aproach. Send stream to wowza

  I have a wowza server running in EC2 instance

  From a linux box at my home I do.

  root# /usr/bin/hdhomerun_config 1250D7B2 scan /tuner1 scan.log
  
  root# /usr/bin/hdhomerun_config 1250D7B2 set /tuner1/channel auto:651000000
  
  root# /usr/bin/hdhomerun_config 1250D7B2 get /tuner1/streaminfo
  
  root# /usr/bin/hdhomerun_config 1250D7B2 get /tuner1/program 190
  
  root# /usr/bin/hdhomerun_config 1250D7B2 set /tuner1/target rtp://<wowza server="server" public="public" ip="ip">:1935/TEST/hdhr
  
  root# echo $?
  
  root# 0
  
  </wowza>

  Ends without error buy doesn’t work
  This was a long shot but ....

  Any ideas to do this.

  Thanks !!!

• Very basic Moviepy script failing to run

  1er juillet 2018, par cem akbulut

  So, I have this very basic script that concatenates two videos, and adds a background sound.

  def intro():
  
  
  
      voiceoverIntro = AudioFileClip(audio[3]) #get path for intro.mp3
  
  
  
  
  
      introVideo = []
  
      temp = p1vid + p2vid + p3vid
  
  
  
      for x in temp: # add product videos to introVideo if they are longer than intro.mp3
  
          x = VideoFileClip(x)
  
  
  
          if x.duration >= voiceoverIntro.duration:
  
              introVideo.append(x)
  
  
  
  
  
      if len(introVideo) >= 1:
  
  
  
          #Get the video and turn off its volume
  
          introBg = introVideo[0].volumex(0).resize((1280,720))
  
          introBg = introBg.set_audio(voiceoverIntro).set_duration(voiceoverIntro.duration)
  
  
  
  
  
          introBg.reader.close()
  
          introBg.audio.reader.close_proc()
  
  
  
          return introBg

  And this function creates the second clip

  def productThreeOpener(productName):
  
      opener3 = VideoFileClip("media/number3.mp4").volumex(0).resize((1280,720))
  
  
  
  
  
  
  
      text = TextClip(productName,fontsize=60,color='white', font="Dekar")\
  
          .set_pos(("right", "center"))\
  
          .set_duration(3)\
  
          .set_start(2)\
  
          .crossfadein(1)\
  
          .crossfadeout(1)\
  
          .margin(right=200,opacity=0)
  
  
  
      opener3 = CompositeVideoClip([opener3, text])
  
  
  
      return opener3

  Now we just concatenate the two outputs

  final_clip = concatenate_videoclips([intro, productThreeOpener], method="compose")

  final_clip.resize((1280, 720)).write_videofile("output/intro.mp4", threads=8, fps=24, progress_bar=False)

  Running the code above returns this error ;

  Traceback (most recent call last):
  
  [MoviePy] >>>> Building video output/intro.mp4
  
    File "C:/Users/Akbulut/PycharmProjects/youtubeVideoEditor/vidEditor/sandbox.py", line 145, in <module>
  
  [MoviePy] Writing audio in introTEMP_MPY_wvf_snd.mp3
  
      final_clip.write_videofile("output/intro.mp4", threads=8, fps=24, progress_bar=False)
  
    File "", line 2, in write_videofile
  
    File "C:\Program Files\Python36\lib\site-packages\moviepy\decorators.py", line 54, in requires_duration
  
      return f(clip, *a, **k)
  
    File "", line 2, in write_videofile
  
    File "C:\Program Files\Python36\lib\site-packages\moviepy\decorators.py", line 137, in use_clip_fps_by_default
  
      return f(clip, *new_a, **new_kw)
  
    File "", line 2, in write_videofile
  
    File "C:\Program Files\Python36\lib\site-packages\moviepy\decorators.py", line 22, in convert_masks_to_RGB
  
      return f(clip, *a, **k)
  
    File "C:\Program Files\Python36\lib\site-packages\moviepy\video\VideoClip.py", line 318, in write_videofile
  
      progress_bar=progress_bar)
  
    File "", line 2, in write_audiofile
  
    File "C:\Program Files\Python36\lib\site-packages\moviepy\decorators.py", line 54, in requires_duration
  
      return f(clip, *a, **k)
  
    File "C:\Program Files\Python36\lib\site-packages\moviepy\audio\AudioClip.py", line 213, in write_audiofile
  
      progress_bar=progress_bar)
  
    File "", line 2, in ffmpeg_audiowrite
  
    File "C:\Program Files\Python36\lib\site-packages\moviepy\decorators.py", line 54, in requires_duration
  
      return f(clip, *a, **k)
  
    File "C:\Program Files\Python36\lib\site-packages\moviepy\audio\io\ffmpeg_audiowriter.py", line 165, in ffmpeg_audiowrite
  
      ffmpeg_params=ffmpeg_params)
  
    File "C:\Program Files\Python36\lib\site-packages\moviepy\audio\io\ffmpeg_audiowriter.py", line 71, in __init__
  
      self.proc = sp.Popen(cmd, **popen_params)
  
    File "C:\Program Files\Python36\lib\subprocess.py", line 594, in __init__
  
      _cleanup()
  
    File "C:\Program Files\Python36\lib\subprocess.py", line 205, in _cleanup
  
      res = inst._internal_poll(_deadstate=sys.maxsize)
  
    File "C:\Program Files\Python36\lib\subprocess.py", line 1025, in _internal_poll
  
      if _WaitForSingleObject(self._handle, 0) == _WAIT_OBJECT_0:
  
  OSError: [WinError 6] İşleyici geçersiz
  
  Exception ignored in: <bound method="method" of="of" object="object" at="at" 0x0000000a885019b0="0x0000000a885019b0">>
  
  Traceback (most recent call last):
  
    File "C:\Program Files\Python36\lib\site-packages\moviepy\audio\io\ffmpeg_audiowriter.py", line 134, in __del__
  
      self.close()
  
    File "C:\Program Files\Python36\lib\site-packages\moviepy\audio\io\ffmpeg_audiowriter.py", line 122, in close
  
      if self.proc:
  
  AttributeError: 'FFMPEG_AudioWriter' object has no attribute 'proc'
  
  
  
  Process finished with exit code 1
  
  </bound></module>

  I strictly followed MoviePY installation guide, installed it and all of its dependencies about 2 days ago. I work on a 64b Windows machine. Python version 3.6.1

  I’ve been stuck with this error for over a day now, and I don’t know what to try.. Any help/advice is highly appreciated.

  Thanks.