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• OpenCV is able to read the stream but VLC not

  25 avril 2023, par Ahmet Çavdar

  I'm trying to stream my webcam frames to an UDP address. Here is my sender code.

  


  cmd = ['ffmpeg', '-y', '-f', 'rawvideo', '-pixel_format', 'bgr24', '-video_size', f'{width}x{height}', 
       '-i', '-', '-c:v', 'mpeg4','-preset', 'ultrafast', '-tune', 'zerolatency','-b:v', '1.5M',
       '-f', 'mpegts', f'udp://@{ip_address}:{port}']
p = subprocess.Popen(cmd, stdin=subprocess.PIPE)
camera = cv2.VideoCapture(0)
while True:
    ret, frame = camera.read()
    cv2.imshow("Sender",frame)
    if not ret:
        break
    p.stdin.write(frame.tobytes())
    p.stdin.flush()
    if cv2.waitKey(1) & 0xFF == ord('q'):
            break


  


  This Python code can make stream successfully. I can read the stream with this receiver code.

  


  q = queue.Queue()
def receive():
    cap = cv2.VideoCapture('udp://@xxx.x.xxx.xxx:5000')
    ret, frame = cap.read()
    q.put(frame)
    while ret:
        ret, frame = cap.read()
        q.put(frame)
def display():
    while True:
        if q.empty() != True:
            frame = q.get()
            cv2.imshow('Receiver', frame)
        k = cv2.waitKey(1) & 0xff
        if k == 27:  # press 'ESC' to quit
            break
tr = threading.Thread(target=receive, daemon=True)
td = threading.Thread(target=display)
tr.start()
td.start()
td.join()


  


  But I can not watch the stream from VLC. I'm going to Media->Open Network Stream->
udp ://@xxx.x.xxx.xxx:5000 to watch stream. After some seconds, the timer that located bottom left of VLC starts to increase but there are no frames in screen, just VLC icon.

  


  I checked firewall rules, opened all ports to UDP connections. I am using my IP address to send frames and watch them.
Also, I tried other video codecs like h264, hvec, mpeg4, rawvideo.
Additionally, I tried to watch stream by using Windows Media Player but it didn't work.

  


  What should I do to fix this issue ?

  


• Running FFMPEG from Shell Script /bin/sh

  19 octobre 2015, par Chris James Champeau

  I am trying to setup a Shell Script to work within an automator watch folder...

  Everything works with the exception of the Run Shell Scrip portion...

  Essentially when a file shows up in the watch folder, it runs the shell scrip which calls FFMPEG and then will move the file to an archive folder for safe keeping. However right now automator is telling me everything worked but now file is being created.

  I have the Shell set to /bin/sh and Pass input set to as arguments

  Here is my script :

  for f in "$@"
  
  do
  
  name=$(basename "$f")
  
  dir=$(dirname "$f")
  
  ffmpeg -i "$f" -b 250k -strict experimental -deinterlace -vcodec h264 -acodec aac "$dir/mp4/${name%.*}.mp4"
  
  echo "$dir/mp4/${name%.*}.mp4"
  
  done

  it does echo the correct filename, but does not actually run ffmpeg

  I have tried adding -exec before it like I have seen in some scripts but still nothing...

• ffmpeg adding jpg and mp3 together to make a video for upload on YouTube

  16 août 2016, par Daniel Meyer

  I am trying to take album art and join it with a track. The file formats in question are jpg and mp3. I have a working ffmpeg command

  ffmpeg -y -i *.jpg -i *.mp3 -c:a copy result.avi

  that creates a video that plays well in VLC, but when I upload it to YouTube, it gets stuck in processing.
  The video will play on YouTube in low 240p, but I would like the image to be of 1440 pixel quality.
  I know YouTube prefers mp4, and that the video I am creating only has a single image. How can I make some changes so the video will be accepted by YouTube and display correctly ?
  YouTube test link : https://www.youtube.com/watch?v=0t2A4erG4II&feature=youtu.be