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• FFMPEG multi livestream - recorded stream send to different services like YT and Twitch at different time (on different button clicks )

  4 octobre 2022, par Ganesh

  Trying for the last 10 days and still no success, I am creating a python application that will accept the URL and visit that URL using chromium, capture that screen and send that real-time screen recording to different live stream acceptors as youtube live, twitch Twitter, Facebook live or some other sources and many of these could be multiple.

  


  There are two challenges (both challenges depend on a user action like different button clicks) -

  


  

  • The time of starting the Livestream we know only one Livestream acceptor and other acceptors could be sent via another API at any time or may not be sent on the whole live stream.

  


  • Any of the streams could be stopped at any moment including the first one which started the original live streaming service

  


  


  To Solve these challenges I am trying the following process (i took mp4 as a source for simplifying)

  


  

  • create a stream and store it into PIPE.stdout

  


  


  ffmpeg_Command_get_stream = 'ffmpeg -re -i test.mp4 -f flv pipe:1'
ffmpeg_Command_get_stream=ffmpeg_Command_get_stream.split()
pipe = sp.Popen(ffmpeg_Command_get_stream,
            stdout=sp.PIPE,
            stderr=sp.PIPE,
            bufsize=8000000,
            shell=True,
            universal_newlines=True
            )
out,err = pipe.communicate()


  


  


  • and send that stream with the help of FFMPEG to the Livestream acceptor with the click of the youtube Livestream button

    


    ffmpeg_Command_send_stream = ['ffmpeg','-i',pipe.stdout,'-f','flv',RTMPURL_YOUTUBE]

    


  


  


  Update Trying to Explain it a little more :

  


  step 1 - I need a real-time stream from the first command, so I used -re in FFMPEG

  


  step 2 - Use above stream as an input for other command and send that as an output as a Livestream to youtube (or twitch/Facebook), But the second step would happen only when the user click on the button "YT LiveStream", Here the tricky thing is there are multiple buttons (YT LiveStream, Twitch LiveStream, Facebook LiveStream) and user can click any time on any of button, also can click on all button one by one.

  


  

  


  sorry for bad explaination

  


  what I am doing wrong ? , Is this Possible ? or need to go with another process,

  


  any help would be greatly appreciated

  


• avcodec/magicyuv : Don't waste stack space

  23 septembre 2020, par Andreas Rheinhardt

  avcodec/magicyuv : Don't waste stack space
  Now that the HuffEntries are no longer sorted by the MagicYUV decoder,
  
  their symbols are trivial : The symbol of the element with index i is i.
  
  They can therefore be removed. Furthermore, despite the length of the
  
  codes being in the range 1..32 bits, the actual value of the codes is
  
  <= 4096 (for 12 bit content). The reason for this is that the longer
  
  codes are on the left side of the tree, so that the higher bits of
  
  these codes are simply zero. By using an uint16_t for the codes and
  
  removing the symbols entry, the size of each HuffEntry is decreased from
  
  eight to four, saving 16KB of stack space.
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavcodec/magicyuv.c

• Convert horizontal video to mobile screen by FFmpeg

  12 mars 2023, par Dopicsi

  I use FFMEG to convert the videos. Currently, if a horizontal video is uploaded, I see it enlarged on mobile. I want the horizontal videos to be vertically centered with black at the top and bottom.

  


  The application only works in vertical mobile view, all videos are played this way.