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• Issue opening video file with OpenCV VideoCapture

  1er mai 2017, par user1938805

  I’ve been reviewing the multitudes of similar questions for this issue, but I’m afraid I just cannot figure out why I cannot open a file in opencv

  I have a file "small.avi", which is a reencoding of "small.mp4" that I got from the internet. I reencoded it with ffmpeg -i small.mp4 small.avi, and I did this because I couldn’t open a mp4 file either and online it recommended trying an avi format first.

  Here is my code (mostly copied from a tutorial, with a few lines to show some relevant info) :

  import cv2
  
  import os
  
  
  
  for _, __, files in os.walk("."):
  
      for file in files:
  
          print file
  
  print ""
  
  
  
  cap = cv2.VideoCapture("small.mp4")
  
  print cap.isOpened()
  
  print cap.open("small.avi")
  
  i = 0
  
  while cap.isOpened() and i < 10:
  
      i += 1
  
      ret, frame = cap.read()
  
      print "read a frame"
  
      gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
  
      cv2.imshow('frame', gray)
  
      if cv2.waitKey(1) & 0xFF == ord('q'):
  
          break
  
  cap.release()
  
  cv2.destroyAllWindows()

  This produces the following output :

  "A:\Program Files\AnacondaPY\Anaconda\python.exe" A:/Documents/Final/VideoProcessor.py
  
  small.avi
  
  small.mp4
  
  VideoProcessor.py
  
  
  
  False
  
  False
  
  
  
  Process finished with exit code 0

  My program does not appear to properly open either file. Following the advice of

  Can not Read or Play a Video in OpenCV+Python using VideoCapture

  and

  Cannot open ".mp4" video files using OpenCV 2.4.3, Python 2.7 in Windows 7 machine,

  I found my cv2 version to be 3.0.0, went to

  A :\Downloads\opencv\build\x86\vc12\bin

  and copied the file opencv_ffmpeg300.dll to

  A :\Program Files\AnacondaPY\Anaconda

  Despite this, the code still does not successfully open the video file. I even tried the x64 versions, and tried naming the file opencv_ffmpeg.dll, opencv_ffmpeg300.dll, and opencv_ffmpeg300_64.dll (for the x64 version). Is there anything else I can try to fix this ?

  Thanks for any help

• Can not play local rtsp URL using FFmpeg in iOS

  12 juin 2015, par Priyanka

  I am using FFmpeg for stream rtsp URL in iOS.
  I am trying to stream a local url but my app is failed to open url
  avformat_open_input method always return -5

  I have played the same url rtsp://172.16.1.226:5544/1 on VLC media player on my iPhone and macbook it works on both.

  After few research i have found there is some problem with rtsp_transport

  I was using av_dict_set(&serverOpt, "rtsp_transport", "tcp", 0); for the server configuration while opening url and the result is can not open feed.

  When I changed it to av_dict_set(&serverOpt, "rtsp_transport", "udp", 1);
  I am able to open url successfully but I continuously getting error rtsp 1 missing packet and so on.

  Can anybody help what should be the right configuration while opening a local rtsp url using ffmpeg.
  Should i need to update av_dict_set(&serverOpt, "rtsp_transport", "udp", 1)

  Thanks in advance

• Evolution #2480 : Pouvoir préparer la nouvelle version d’un article en ligne

  28 décembre 2020, par RastaPopoulos ♥

  Ça semble un peu du bricolage vu de loin, et que pour les articles uniquement. À terme, le début de dev de Marcimat "Propositions de modifications" semble plus pérenne, pour n’importe quels objets, même s’il reste du travail d’interface à ajouter : https://git.nursit.net/open/propositions_modifications