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• Piping pi's opencv video to ffmpeg for Youtube streaming

  16 mai 2017, par Mango Plaster

  This is a small python3 script reading off picam using OpenCV :

  #picamStream.py
  
  
  
  import sys, os
  
  from picamera.array import PiRGBArray
  
  from picamera import PiCamera
  
  import time
  
  import cv2
  
  
  
  # initialize the camera and grab a reference to the raw camera capture
  
  camera = PiCamera()
  
  camera.resolution = (960, 540)
  
  camera.framerate = 30
  
  rawCapture = PiRGBArray(camera, size=(960, 540))
  
  
  
  # allow the camera to warmup
  
  time.sleep(0.1)
  
  
  
  # capture frames from the camera
  
  for frame in camera.capture_continuous(rawCapture, format="bgr", use_video_port=True):
  
  
  
      image = frame.array
  
  
  
      # ---------------------------------
  
      # .
  
      # Opencv image processing goes here
  
      # .
  
      # ---------------------------------
  
  
  
      os.write(1, image.tostring())
  
  
  
      # clear the stream in preparation for the next frame
  
      rawCapture.truncate(0)
  
  
  
  # end

  And I am trying to pipe it to ffmpeg to Youtube stream

  My understanding is that I need to reference below two commands to somehow come up with a new ffmpeg command.

  Piping picam live video to ffmpeg for Youtube streaming.

  raspivid -o - -t 0 -vf -hf -w 960 -h 540 -fps 25 -b 1000000 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental -f flv rtmp ://a.rtmp.youtube.com/live2/[STREAMKEY]

  Piping OPENCV raw video to ffmpeg for mp4 file.

  python3 picamStream.py | ffmpeg -f rawvideo -pixel_format bgr24 -video_size 960x540 -framerate 30 -i - foo.mp4

  So far I’ve had no luck. Can anyone help me with this ?

• Downloading a video from youtube and convert to MP4

  26 mars 2019, par Ghomrani Ilyes

  I created a script to download a youtube video and extract an images from it for each period

  screenshotvideo

  def screenshotvideo(url, interval, id, fullduration, title, quality):
  
      interval = int(interval)
  
      parsed_t = isodate.parse_duration(fullduration)
  
      durationseconds=parsed_t.total_seconds()
  
      iterat=int(durationseconds/int(interval))
  
      for i in range(0, iterat):
  
          print(str(id))
  
          print(str(i))
  
          print(str(i*interval))
  
          part(url, time.strftime('%H:%M:%S', time.gmtime(int(i*interval))), "00:00:01", title+"-"+str(id), quality)

  part

  def part(url, starttime, duration, name, quality):
  
      f = os.popen("ffmpeg $(youtube-dl -f "+quality+" -g '"+url+"' | sed 's/.*/-ss "+starttime+" -i &/') -t "+duration+" -c copy "+name+".mp4")
  
      now = f.read()
  
      print(now)
  
      f = os.popen("ffmpeg -i "+name+".mp4 -ss 00:00:00 -vframes 1 "+name+".jpg")
  
      now = f.read()
  
      print(now)
  
      f = os.popen("rm -rf "+name+".mp4")
  
      now = f.read()
  
      print(now)

  so i got the folowing error in the first ffmpeg command

  [mp4 @ 0x55d537f64240] Could not find tag for codec vp8 in stream #0, codec not currently supported in container.

  Could not write header for output file #0 (incorrect codec parameters ?) : Invalid argument

• Downloading a video from youtube and convert to MP4

  24 mars 2019, par Ilyes GHOMRANI

  I created a script to download a youtube video and extract an images from it for each period

  screenshotvideo

  def screenshotvideo(url, interval, id, fullduration, title, quality):
  
      interval = int(interval)
  
      parsed_t = isodate.parse_duration(fullduration)
  
      durationseconds=parsed_t.total_seconds()
  
      iterat=int(durationseconds/int(interval))
  
      for i in range(0, iterat):
  
          print(str(id))
  
          print(str(i))
  
          print(str(i*interval))
  
          part(url, time.strftime('%H:%M:%S', time.gmtime(int(i*interval))), "00:00:01", title+"-"+str(id), quality)

  part

  def part(url, starttime, duration, name, quality):
  
      f = os.popen("ffmpeg $(youtube-dl -f "+quality+" -g '"+url+"' | sed 's/.*/-ss "+starttime+" -i &/') -t "+duration+" -c copy "+name+".mp4")
  
      now = f.read()
  
      print(now)
  
      f = os.popen("ffmpeg -i "+name+".mp4 -ss 00:00:00 -vframes 1 "+name+".jpg")
  
      now = f.read()
  
      print(now)
  
      f = os.popen("rm -rf "+name+".mp4")
  
      now = f.read()
  
      print(now)

  so i got the folowing error in the first ffmpeg command

  [mp4 @ 0x55d537f64240] Could not find tag for codec vp8 in stream #0, codec not currently supported in container.

  Could not write header for output file #0 (incorrect codec parameters ?) : Invalid argument