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• Opencv VideoCapture not streaming RTSP link and returns "no frame !"

  6 septembre 2023, par Asadullah Naeem

  I am trying to stream my HikVision IP camera throough python. I am using cv2.VideoCapture("rtsp_link") which works fine on my Laptop but when I try to run the same python script with same Opencv and FFmpeg version it gives me following error :

  


  Error :

  


  [h264 @ 000002124c7f9a40] missing picture in access unit with size 47
[h264 @ 000002124c7f9a40] no frame!


  


  I have so far tried to run this script on 5 computer devices but it gives the same error. I am using the following python script and my Opencv version is 4.6.0.66 and ffmpeg version 2022-06-20-git-56419428a8-essentials_build-www.gyan.dev :

  


  Python Script :

  


  import cv2

# RTSP stream URL
rtsp_url = "rtsp://username:password@ip_address:port/Streaming/Channels/501"

# Open the RTSP stream
cap = cv2.VideoCapture(rtsp_url)

# Check if the stream was successfully opened
if not cap.isOpened():
    print("Failed to open RTSP stream.")
    exit()

# Read and display frames from the stream
while True:
    # Read a frame from the stream
    ret, frame = cap.read()

    # Check if the frame was successfully read
    if not ret:
        print("Failed to read frame from RTSP stream.")
        break

    # Display the frame
    cv2.imshow("RTSP Stream", frame)

    # Exit if 'q' is pressed
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# Release the resources
cap.release()
cv2.destroyAllWindows()



  


  Update :

  


  Code runs on a laptop on both wifi and mobile internet (4G) but on other devices rtsp link is accessible only with mobile internet (4G).

  


• Android - How can I pass camera stream to ffmpeg, using Camera2 library ?

  29 mars 2021, par Juan José Cetraro

  I am trying to create an app that shows the camera of the device on the screen, and also streams the camera by srt. To do this, I am using Camera2 library, and ffmpeg (in partucular I am using https://github.com/tanersener/mobile-ffmpeg, that is a ffmpeg wrapper for Android).

  


  My plan is to get the camera stream using Camera2 (using the method onImageAvailable on ImageReader.OnImageAvailableListener class), and send this stream to udp ://localhost:1234. Then, I can use ffmpeg to get that stream by udp, and send it by srt.

  


  I've already solved the part of sending the stream by srt using ffmpeg, and it works fine. In fact, if I set "android_camera" as the input of my ffmpeg command, my app works ok. The problem with this approach, is that if I do that, I block the access to the camera, so I can't show the camera on the screen with another library.

  


  I also found a code that uses Camera2 to stream the camera by udp, and it works, but the problem with this code is that converts each frame to bitmap before sending it by udp, and it makes that it is not performant.

  


  So, I need to know which is the best way to pass the data by udp to ffmpeg, so ffmpeg could process it and send it by srt ?

  


  Camera2 let me to configure which format I want to receive the frames on my listener :

  


  ImageReader.newInstance(1280, 720, ImageFormat.JPEG, /*maxImages*/2);


  


  In this example I am setting JPEG as ImageFormat, but here I let you all the available formats I could use :

  


  UNKNOWN, RGB_565, YV12, Y8, Y16, NV16, NV21, YUY2, JPEG, DEPTH_JPEG, YUV_420_888, YUV_422_888, YUV_444_888, FLEX_RGB_888, FLEX_RGBA_8888, RAW_SENSOR, RAW_PRIVATE, RAW10, RAW12, DEPTH16, DEPTH_POINT_CLOUD, RAW_DEPTH, PRIVATE, HEIC

  


  This is the method where I am going to receive each frame, and what I need to know is what kind of transformation I have to do before sending the frame by udp to ffmpeg ? :

  


  @Override
public void onImageAvailable(ImageReader reader) {

}


  


  Thanks in advance for reading the question :)

  


• Youtube Live streaming Audio function not working Android

  13 avril 2017, par Muthukumar Subramaniam

  I am using youtube watch me github project. I recorded the live streaming video from android mobile to youtube. Live streaming videos works perfectly but the audio is not working. Please give your suggestions.