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• FFmpeg stream video to rtmp from frames OpenCV python

  11 mars 2024, par batata oussama

  In the context of indistural project, i developed a real time application to detect person with AI algorithms. In local i get and display videos with OPENCV operating with frames.

  


  The objective is to realise a stream video from frames of Opencv to rtmp server

  


  FFmpeg seems a good perspective. However, often the stream strats from .mp4 or several .jpg to publish stream video on rtmp server.

  


  Thank you.

  


• how to implement streaming feautre on our website

  14 février 2023, par Mohamed Taha

  we are building a website -for education purpose -and want to add streaming function on it

  


  our website like a social media platform so someone want to strat streaming (the media will be either from camera or screen sharing )

  


  from where i can start

  


  i have searched about this topic and i arrived at knowing the theortical steps to stream video
_ capture ,encoding , mixin ,send to server
but though i don't know where to start too

  


  i found tool called FFmpeg can do this but on windows platform and i think won't help.

  


• ffmpeg 180 degree panoramic fisheye image to equirectangular / flat

  7 juillet 2024, par Willy62

  I am trying to get my Hikvision Panovu image of a sportsfield to look like a standard camera image, similar to what would be seen with a Veo solution / traditional camera.

  


  This is what the image would ideally look like with a little bit of zoom. Note the players are all upright and it looks "correct" and not skewed with the far end of the field in line with the horizon.

  


  veo sample image

  


  The original image looks like this (same field but other side). This is a 180 degree panoramic image from a Hikvision camera as found here.

  


  It provides the following output natively.

  


  hikvision native view

  


  I have had some luck converting the image with ffmpeg using the v360 filter. Note there is a downward tilt meaning I have to apply some yaw to correct it.

  


  v360=input=fisheye:output=rectilinear:ih_fov=180:iv_fov=87.5:d_fov=87.5:pitch=20:yaw=5:w=3840:h=2160


  


  And this gets the following output :

  


  deskewed v360 image

  


  So the challenge here to make the original image flat/equirect but to address the skew such that :

  


  

  • the players are orientated "upright"

  


  • the far sideline of the field looks like a straight line in line with the horizon

  


  • the image quality is preserved as best as possible

  


  


  With these cameras the image is 32MP so there is the opportunity to do an ePTZ into the area of interest.

  


  I suspect v360 isnt the right choice here and it is some remap-style filter, or perhaps I am best going across to gstreamer or similar.

  


  I tried an ffmpeg v360 filter and it partially works, but the players are still skewed because the top of the image is not wide enough. The issue can possibly be solved by correctly applying a couplex perspective filter, but I think this will only mask the issue and perspective requires a complex filter that hasn't worked for me so far.