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• How to start Quicktime streaming immediately

  16 octobre 2012, par forthrin

  I am trying to make Quicktime files stream from a HTML document using the <video></video> tag.

  The video format is :

  Video: h264 (Main), yuv420p, 640x360, 2175 kb/s, 24 fps, 24 tbr, 24 tbn, 48 tbc
  
  Audio: aac, 48000 Hz, stereo, s16, 104 kb/s

  However, the browser does not start playing the video until after downloading the whole file (which takes minutes). I, of course, want the video to start streaming as soon as possible.

  The guy who gave me the video files has recollection of some "Streaming friendly" output option in his video editing software that resolved a similar problem earlier. However, many of the video files don't have original project files anymore and thus cannot be regenerated.

  So my question is : How can I make the existing video files stream immediately ? (I have FFMPEG on my machine) ? Or does the solution lie elsewhere ?

• Real time streaming and process frames

  31 mai 2019, par Wenbin Xu

  I want to process usb camera’s real-time input frames while streaming the original frames through rtmp protocal at the same time. I have implemented both functionality separately, image processing function uses cv2.VideoCapture(1) to get frames and streaming uses subprocess to run command ffmpeg -s 640x480 -i /dev/video1 -f flv -q 0 -an rtmp://xxxxxxxx.

  When I put them together, I realized that they uses the same hardware, which is /dev/video1. So only one of the two functions will work.

  I understand I have to access the camera only once and provide the frames to both processing and streaming. I tried to get frames from opencv and streaming each frame through ffmpeg and rtmp. Here is the code I tried :

  command = ['ffmpeg', 
  
             '-s', '640x480',
  
             '-i', '-', 
  
             '-f', 'flv', 
  
             '-q', '0', 
  
             '-an', 
  
             'rtmp://xxxxxxxx']
  
  pipe = subprocess.Popen(command, stdin=sp.PIPE)
  
  pipe.stdin.write(frame.tostring()) # stream a singel frame

  But this is not working.

  Any idea how to stream single frames (read by opencv) using ffmpeg and rtmp, or using ffmpeg to get input frames in python, or even gstreamer since my jetson TX2 has hardware acceleration for gstreamer.

• Webrtc to rtmp using ffmpeg for live streaming from webcam to browsers and mobile

  6 février 2017, par Omar Suleiman

  I am new in live streaming, and i am working on the website to allows user to broadcasting and visitors can watch and listen the video, I use webrtc from webcam and the url is blob, so I can not find the best way to transcode webrtc to rtmp or hls to show the live streaming in the browsers as a flash and on mobile as hls. I dont know from where can i start.

  what is the best way for transcoding (ffmpeg or red5 or nginx or what) - like : 1 broadcaster to 1000 viewers can watch and listen and there is many broadcasters also.

  what about CPU usage.

  I am used asp.net MVC

  your help is very appreciated.
  Thanks.