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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).

  


• Revision 0ba1542f12 : Vidyo : Support for one-pass rc-enabled SVC encoder Adds support for one-pass rc

  7 novembre 2014, par Deb Mukherjee

  Changed Paths :
   Modify /examples/vp9_spatial_svc_encoder.c

  
   Modify /vp9/vp9_cx_iface.c

  
   Modify /vpx/src/svc_encodeframe.c

  
   Modify /vpx/svc_context.h

  
   Modify /vpx/vp8cx.h

  
   Modify /vpx/vpx_encoder.h

  
  
  Vidyo : Support for one-pass rc-enabled SVC encoder

  Adds support for one-pass rc-enabled SVC encoder with callbacks for
  getting per-layer packets.
   the callback function registration is implemented as an encoder
  control function.
   if the callback function is not registered, the old way of
  aggregating packets with superframe will take effect.
   one more control function “VP9E_GET_SVC_LAYER_ID” has been
  implemented to get the temporal/spatial id from the encoder
  within the callback. This can be used to get the ids to put on RTP
  packet.

  Change-Id : I1a90e00135dde65da128b758e6c00b57299a111a

• Revision 090f4d4b5a : Adds support for raw yuv files for 422/444 Adds support for raw yuv inputs in 4

  16 juillet 2014, par Deb Mukherjee

  Changed Paths :
   Modify /tools_common.c

  
   Modify /vpxdec.c

  
   Modify /vpxenc.c

  
   Modify /vpxenc.h

  
  
  Adds support for raw yuv files for 422/444

  Adds support for raw yuv inputs in 422/444 sampling for use
  in profiles 1 and 3.
  New options added to vpxenc are :
  — i422 and —i444, which are to be used in conjunction with
  — width, —height, and —fps for proper raw yuv handling.
  A new option is added to vpxdec :
  — rawvideo, which enforces raw yuv video output for the
  bit-stream decoded irrespective of 420, 422 or 444 sampling.
  The existing options —i420 and —yv12
  are specialized for use only for 420 content.

  Change-Id : I2e3028380709afa673bf2e2c25ad5e271a626055