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• How to convert (re-wrap) Transport Stream to MPEG-4 container in iOS app ?

  27 janvier 2015, par Aleksandr Suvorov

  I have a live stream in .ts format, containing AAC audio and H.264 video. I want to play it on iOS devices. I tried to use a movie player based on FFmpeg to decode and play video, but the audio was lagging.

  Can I rewrap this Transport Stream to an MPEG-4 container to play on iOS devices – without converting it server-side ?

  The server returns me a URL of the .ts live stream and my goal is to play this stream on iOS devices without an .m3u8 playlist because I can’t get it from the server.

• How to convert (re-wrap) Transport Stream to MPEG-4 container in iOS app ?

  28 novembre 2018, par Aleksandr Suvorov

  I have a live stream in .ts format, containing AAC audio and H.264 video. I want to play it on iOS devices. I tried to use a movie player based on FFmpeg to decode and play video, but the audio was lagging.

  Can I rewrap this Transport Stream to an MPEG-4 container to play on iOS devices – without converting it server-side ?

  The server returns me a URL of the .ts live stream and my goal is to play this stream on iOS devices without an .m3u8 playlist because I can’t get it from the server.

• OpenCV videocapture() not opening video file from hard disk

  8 janvier 2020, par Rossi Riccardo

  Despite being a lot of threads on the issue of open CV not being able to open videos i still can’t manage to solve it.

  I’m trying to open and extract frames using openCV with spyder (os : windows 10, python 3.7.4). As far as i know (provided the file path is correct) cv2.read returns a 0 if either the codec is unsupported (converted the video to H264 to be sure and also downloaded a test avi used to test out this very issue in an older post ) or if there is a problem with the ffmpeg dependency.

  Since i thought this was the source of the issue i added conda and phyton to the PATH with the SETX command and, after that, ended up copying ffmpeg dll and cv2 folders everywhere since i couldn’t understand well were i was supposed to paste it. Results is that i still can’t make it work and can’t even opt to try to make the frame extractor directly with ffmpeg since even that one gives me an error with a copypasted function from it’s site.

  Here is the code :

  import os 
  
  import ffmpeg
  
  
  
  
  
  def read_frame_as_jpeg(in_filename, frame_num):
  
      out, err = (
  
          ffmpeg
  
          .input(in_filename)
  
          .filter('select', 'gte(n,{})'.format(frame_num))
  
          .output('pipe:', vframes=1, format='image2', vcodec='mjpeg')
  
          .run(capture_stdout=True)
  
      )
  
  
  
  # Read the video from specified path 
  
  #cam = cv2.VideoCapture(r'C:\MY\folder\264H.mp4') 
  
  cam = cv2.VideoCapture(r'C:\Users\name\Downloads\drop.avi') 
  
  fps=60
  
  vid_start=371
  
  vid_end=377
  
  sens=20
  
  out_dir=r"C:\MY\folder"
  
  out_dir=out_dir+'\\'
  
  print(out_dir)
  
  
  
  stri="drop.avi"#even tried putting the fiel in the same directory, no change
  
  read_frame_as_jpeg(stri, 1)
  
  
  
  # frame 
  
  currentframe = 0
  
  
  
  while(True): 
  
  
  
      # reading from frame 
  
      ret,frame = cam.read()
  
  
  
      print(currentframe)
  
      if ret and currentframe>= (fps*vid_start)-sens and currentframe<= (fps*vid_end)+sens: 
  
          # if video is still left continue creating images 
  
          name = out_dir+ str(currentframe) + '.bmp'
  
          print ('Creating...' + name) 
  
  
  
          # writing the extracted images 
  
          cv2.imwrite(name, frame) 
  
  
  
          # increasing counter so that it will 
  
          # show how many frames are created 
  
          currentframe += 1
  
      else: 
  
          break
  
  
  
  # Release all space and windows once done 
  
  cam.release() 
  
  cv2.destroyAllWindows()  

  The ffpeg error that i get is

  [WinError 2] Impossible to find the specified file

  while on the other hand since videocapture returns a 0 it doesn’t even enter the loop so i get just a "0" print