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• Read rtmp live streaming video using python

  20 octobre 2022, par Telugu Tracker

  I am streaming a session using rtmp server(NGINX). I got the stream url as
rtmp://ip:port/live/stream_name.
How can I read the live stream in my python code(or any other) to do live transcription ?

  


• HLS live stream stops working with AbortError after running fine for a while

  20 juillet 2020, par mandrakey

  Before I go file a bug with Video.js I wanted to see if I maybe have gotten something wrong. The situation is this :

  


  

  • I have a RTSP live stream, which I convert to HLS using ffmpeg (works)

  


  • I want to play that HLS stream using Video.js in the browser

  


  


  After I start ffmpeg, all works as expected and I can watch the live stream in the browser. This was, say, around 4pm. I go home for the day and when I try to access the stream again in the morning (around 8am, freshly started browser) I just get a black image (Firefox) or a still (Chrome) and a never ending loading animation.

  


  The browser console shows the following output every 6 seconds (which is my chunk length) :

  


  AbortError: The operation was aborted. 
XHR GET http://server/hls/live/stream1/720p6.ts [HTTP/1.1 200  71ms]
XHR GET http://server/hls/live/stream1/720p7.ts [HTTP/1.1 200  64ms]
XHR GET http://server/hls/live/stream1/720p8.ts [HTTP/1.1 200  62ms]
XHR GET http://server/hls/live/stream1/720p9.ts [HTTP/1.1 200  57ms]
XHR GET http://server/hls/live/stream1/720p0.ts [HTTP/1.1 200  63ms]


  


  Note : The chunk numbers in the end do change correctly, so it does not look like an infinite loop where video.js tries to access the same files over and over again.

  


  I have compared the m3u8 contents from a time when this happens to just after I restarted ffmpeg. The only difference I can spot is that the sequence number has increased :

  


  Working version

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:6
#EXT-X-MEDIA-SEQUENCE:2
#EXTINF:6.000011,
720p2.ts
#EXTINF:5.999989,
720p3.ts
#EXTINF:6.000000,
720p4.ts
#EXTINF:6.000000,
720p5.ts
#EXTINF:6.000000,
720p6.ts


  


  Not working version

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:6
#EXT-X-MEDIA-SEQUENCE:45255
#EXTINF:6.000011,
720p5.ts
#EXTINF:5.999989,
720p6.ts
#EXTINF:6.000000,
720p7.ts
#EXTINF:6.000011,
720p8.ts
#EXTINF:5.999989,
720p9.ts


  


  What I have confirmed so far :

  


  

  • The video chunks ffmpeg creates work. I have downloaded newly generated chunks and played them using VLC : Got a 6 second video as expected.

  


  • This also means the source stream still works as expected.

  


  • It does not seem to be an issue with the browser as both Firefox and Chrome show the same behaviour.

  


  • When I restart ffmpeg, which as far as I can see only resets the sequence number, everything works fine again after I reload the video.js player.

  


  • It is no one time issue : I have tried this more than 4 days in a row now. Happens every time.

  


  


  Have I stumbled upon a bug in video.js here or am I missing something ?

  


  For reference, this is how I start ffmpeg :

  


  ffmpeg -v info -rtsp_transport tcp -i rtsp://source/stream -c:v copy -c:a copy -hls_time 6 -hls_wrap 10 -start_number 1 /path/to/stream1/720p.m3u8


  


  Thank you very much for reading and taking the time so far. Any help will be much appreciated :)

  


• Webcam live preview with FFMPEG

  17 juin 2013, par Edoardo

  Is it possible to display a window with a live preview of a WebCam with ffmpeg (or ffmplay) ?

  I am able to capture video from a webcam but not to display it live by command line.