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• Best approach to stream RTSP IP Cam feed to React app and node.js express server

  17 juillet 2024, par JuicyPhan

  I am trying to build a set-up whereby I stream multiple IP Cam RTSP Video feeds to multiple users.
It needs to have minimal latency.

  


  Server Hardware : Static IP Synology NAS
  
Front-End : React
  
Back-End : Node.js Express
  
STUN/TURN server : Coturn
  
Video Feed : Multiple IP Camera's RTSP feeds
  
Video Encoder : ffmpeg(?)
  
Video Decoder : ?
  
Video Format : ?
  
Streaming Protocol : WebRTC

  


  I have every individual component up however am struggling with the part whereby I encode the RTSP feed.

  


  What video format do I encode it to and how do I use WebRTC to stream to viewers on the front-end ?

  


• In Python, why do 'writer' is considered to be as an unexpected keyword argument for save

  23 mars 2014, par Strömungsmechanik

  I would like to save an animation using the function save in Python. During compilation, I get the following message :

  anim.save('mymovie.mp4',writer="ffmpeg")
  
  TypeError: save() got an unexpected keyword argument 'writer'

  Please note that I have installed successfully FFmpeg. Here is a minimal working environment :

  import numpy as np
  
  from matplotlib import pyplot as plt
  
  from matplotlib import animation
  
  from numpy import pi
  
  
  
  X,Y = np.meshgrid(np.arange(0,2*np.pi,.2),np.arange(0,2*np.pi,.2) )  
  
  U = np.cos(X)
  
  V = np.sin(Y)
  
  
  
  fig,ax = plt.subplots(1,1)
  
  Q = ax.quiver( X, Y, U, V, pivot='mid', color='r', units='inches')
  
  
  
  ax.set_xlim(0, 2*pi)
  
  ax.set_ylim(0, 2*pi)
  
  
  
  def update_quiver(num, Q, X, Y):
  
      U = np.cos(X + num*0.1)
  
      V = np.sin(Y + num*0.1)
  
      Q.set_UVC(U,V)
  
      return Q,
  
  
  
  anim = animation.FuncAnimation(fig, update_quiver, fargs=(Q, X, Y),
  
      interval=10, blit=False)
  
  
  
  anim.save('mymovie.mp4',writer="ffmpeg")

• Merge/Blend/Composite transparent webm files with a jpg/png using ffmpeg

  13 avril 2021, par Lokanath

  I previously had generated color.webm and alpha.webm files withffmpeg using png images.
However, when I play the generated videos in my application it consumes quite some resources so I have decided to create a standard video(No alpha needed), I cannot re-record the videos as there are a lot of them at this point.

  


  I am generating the alpha and color video using the following command ffmpeg -framerate 30 -i img%d.png -filter_complex "alphaextract[a]" -map 0:v -c:v libvpx-vp9 -pix_fmt yuv420p -auto-alt-ref 0 -crf 15 -b:v 0 color.webm -map "[a]" -c:v libvpx-vp9 -pix_fmt yuv420p -auto-alt-ref 0 -crf 15 -b:v 0 alpha.webm

  


  I am looking to get a final video output where in alpha values are replaced with the png/jpg image, it's more like replacing the green screen with a background however in my case greenscreen is the alpha channel.

  


  Could any one let me know how to combine alpha.webm, color.webm with a jpg/png image without minimal or no quality loss ?
.