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• Revision 3c42657207 : Checking scale factors on access. It is possible to have invalid scale factors

  23 août 2013, par Dmitry Kovalev

  Changed Paths :
   Modify /vp9/common/vp9_reconinter.c

  
   Modify /vp9/common/vp9_scale.c

  
   Modify /vp9/common/vp9_scale.h

  
   Modify /vp9/decoder/vp9_decodframe.c

  
   Modify /vp9/encoder/vp9_temporal_filter.c

  
  
  Checking scale factors on access.

  It is possible to have invalid scale factors and not access them
  during decoding. Error is reported if we really try to use invalid scale
  factors.

  Change-Id : Ie532d3ea7325ee0c7a6ada08269f804350c80fdf

• FFmpeg Error Checking : Broken or missing AVI Index

  17 avril 2017, par Jake

  I have three example videos, good.avi, damaged1.avi, and damaged2.avi. The first will play in VLC, but the second two both error with the same "Broken or missing AVI Index" message.

  I have thousands of these videos which I need to process in MATLAB, so I’m trying to error check using FFmpeg like this : ffmpeg -v error -i vidname.avi -f null - 2>&1

  Now here’s the part I don’t understand :
  On good.avi it completes with no output -OK
  On damaged1.avi it outputs [mjpeg @ 0x7fc1dd813800] overread 1 -OK
  On damaged2.avi it completed with no output as in good.avi - ?????

  Would someone with video codec/FFmpeg experience please help me understand what’s going on here so I can develop a more robust error check ?

  They also both have identical codec details in VLC :
  

• Checking if IP Camera is connected or not with cv2 faster ?

  15 novembre 2022, par Barış Aktaş

  I have code that works on 2 IP Cameras but before running my main algorithm I would like to check if my IP Cameras are connected or not. I wrote this code and i have used it before with 2 USB cameras now i am having a problem with IP Cameras.

  


  import cv2 

def check_connnections():
    #Check cam1
    cam1_ok = False    
    cam1 = cv2.VideoCapture('rtsp://admin:Tom12345.@192.168.0.33:554/onvif1') 
    if cam1.isOpened():
        cam1_ok = True

    #Check cam2
    cam2_ok = False
    cam2 = cv2.VideoCapture('rtsp://admin:Tom12345.@192.168.0.33:554/onvif1') 
    if cam2.isOpened():
        cam2_ok = True

    print(f'Cam1 Connection Status: {cam1_ok}')
    print(f'Cam2 Connection Status: {cam2_ok}')


check_connnections()


  


  Now if i plug the cameras i get :
Cam1 Connection Status: True , Cam2 Connection Status: True and when i unplug the cameras i expect Cam1 Connection Status: False , Cam2 Connection Status: False but it takes 3 minutes for cv2.VideoCapture() function to finish and return Falseif the IP cameras are not connected while it runs instantly for USB cameras. Is there a faster way to check this ?

  


  I tried same thing with USB Cameras, i also tried try:... except:pass but i couldn't find i way.