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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 ?

  


• Unable to get a frame using ffmpeg [closed]

  24 mars 2023, par Prakhar

  I have an SRT stream, which I am listening on an Ubuntu server. I want to be able to take a frame as a PNG at any given time, so that I can analyze that image. Given that it's a live stream, I should not be defining time of when do I want to download the frame, it should be instantaneous.

  


  I tried following but in vain

  


  ffmpeg -i 'srt://10.174.190.221:5000?streamid=ABCDE' %04d.png


  


  This just starts the streaming, and does not produce the PNG files. Output which I get on screen

  


      Last message repeated 1 times
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] no frame!
[h264 @ 0x7317c80] non-existing PPS 0 referenced
    Last message repeated 1 times
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] no frame!
[h264 @ 0x7317c80] non-existing PPS 0 referenced
    Last message repeated 1 times
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] no frame!
[h264 @ 0x7317c80] non-existing PPS 0 referenced
    Last message repeated 1 times
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] no frame!
[h264 @ 0x7317c80] non-existing PPS 0 referenced
    Last message repeated 1 times
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] no frame!
[h264 @ 0x7317c80] non-existing PPS 0 referenced
    Last message repeated 1 times
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] non-existing PPS 0 referenced
[h264 @ 0x7317c80] decode_slice_header error
[h264 @ 0x7317c80] no frame!

Input #0, mpegts, from 'srt://10.174.190.221:5000?streamid=ABCDE':
  Duration: N/A, start: 61221.726022, bitrate: N/A
  Program 1 
    Metadata:
      service_name    : ABCDE
      service_provider: VITEC
  Stream #0:0[0x4da]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 59.94 fps, 59.94 tbr, 90k tbn
  Stream #0:1[0x2d](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> png (native))
Press [q] to stop, [?] for help
Finishing stream 0:0 without any data written to it.
Output #0, image2, to '%04d.png':
  Metadata:
    encoder         : Lavf59.27.100
  Stream #0:0: Video: png, rgb24, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 59.94 fps, 59.94 tbn
    Metadata:
      encoder         : Lavc59.37.100 png
frame=    0 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed=   0x    
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown


  


  Would appreciate any help

  


• Gstreamer convert and display video v4l2 - tee problems in rust

  27 mars 2023, par d3im

  I have USB grabber v4l2 source and I want to tee stream to autovideosink and x264enc to file (now as fake black hole)

  


  When I disable one or another branch it works but together Pipeline goes :

  


  Pipeline state changed from Null to Ready
Pipeline state changed from Ready to Paused


  


  and stays there never switches to Playing

  


  gst-launch-1.0 with similar functionality works well.

  


      gst::Element::link_many(&[&pw_video, &v_caps, &vid_queuey, &vid_tee]).unwrap();
    gst::Element::link_many(&[&vid_queue1, &autovideoconvert, &vid_queuex, &autovideosink]).unwrap();
    gst::Element::link_many(&[&vid_queue2, &autovideoconvert_x264, &vid_queue3, &x264, &vid_queue4, &fake]).unwrap();

    let tee_display_pad = vid_tee.request_pad_simple("src_10").unwrap();
    let vid_queue1_pad = vid_queue1.static_pad("sink").unwrap();

    tee_display_pad.link(&vid_queue1_pad).unwrap();

    let tee_convert_pad = vid_tee.request_pad_simple("src_20").unwrap();
    let vid_queue2_pad = vid_queue2.static_pad("sink").unwrap();

    tee_convert_pad.link(&vid_queue2_pad).unwrap();


  


  How can I use tee in rust properly to have playable pipeline with two branches ?

  


  Update : I read some posts about increasing queue size, so I tried for this and then all queues :

  


      let vid_queue1 = gst::ElementFactory::make("queue")
        .name("queue1")
        .property("max-size-buffers", 5000 as u32)
        .property("max-size-bytes", 1048576000 as u32)
        .property("max-size-time", 60000000000 as u64)
        .build()
        .expect("queue1");


  


  but it didn't help so I tried set zero latency :

  


      let x264 = gst::ElementFactory::make("x264enc")
        .name("x264")
        .property_from_str("speed-preset", "ultrafast")
        .property_from_str("pass", "qual")
        .property_from_str("tune", "zerolatency")
        .property("quantizer", 0 as u32)
        .property("threads", 8 as u32)
        .build()
        .expect("!x264");


  


  and it works now. But comparable gst-launch-1.0 settings didn't had such option - only queues sizes increased.

  


  Is there any other option than setting zerolatency ?