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• Video Stabilization with spin product OpenCV

  28 mars 2021, par a.masri

  I'm trying to stabilize video using OpenCV, but my video is a walkaround 360 spin like this spin, but the stabilize not perfect has a shaking because the optical flow not working perfectly with the spined video

  


  can you find python code here

  


  and I'm trying to use FFmpeg but still, have the same issue,

  


  this command

  


  INPUT=$1
STB_OUTPUT=stb1.mp4

ffmpeg -y -i "$INPUT" -vf vidstabdetect=stepsize=32:shakiness=5:accuracy=15:result="$TRF" -f null -

ffmpeg -y -i "$INPUT" -vf vidstabtransform=input="$TRF":smoothing=30,unsharp=5:5:0.8:3:3:0.4  "$STB_OUTPUT"


  


• TLS issue with ffmpeg

  22 mai 2017, par true_gler

  I try to use TLS to verify a stream... (ffmpeg.org/ffmpeg-protocols.html#tls)

  ca_file, cafile=filename
  A file containing certificate authority (CA) root certificates to treat as trusted. If the linked TLS library contains a default this might not need to be specified for verification to work, but not all libraries and setups have defaults built in. The file must be in OpenSSL PEM format.

  tls_verify=1|0
  If enabled, try to verify the peer that we are communicating with. Note, if using OpenSSL, this currently only makes sure that the peer certificate is signed by one of the root certificates in the CA database, but it does not validate that the certificate actually matches the host name we are trying to connect to. (With GnuTLS, the host name is validated as well.)

  This is disabled by default since it requires a CA database to be provided by the caller in many cases.

  cert_file, cert=filename
  A file containing a certificate to use in the handshake with the peer. (When operating as server, in listen mode, this is more often required by the peer, while client certificates only are mandated in certain setups.)

  key_file, key=filename
  A file containing the private key for the certificate.

  listen=1|0
  If enabled, listen for connections on the provided port, and assume the server role in the handshake instead of the client role.

  Generally, i try to grab the screen at my client, send the captured via live stream to the server and display it there (with e.g. ffplay).
  All this happens in a LAN.

  I am a little bit confused...

  • What are the parameters at the client side (ffmpeg) ?
  • What are the parameters at the server side for display (ffplay) ? (Don’t i need here the ca_file specification ??)

  My commands I used so far, I am pretty sure I miss something ?!

  sudo ffmpeg -r 60 -f x11grab -s 1920x1080 -i :0.0 -c:v libx264 -b:v 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k -pix_fmt yuv420p -preset ultrafast -tune zerolatency -bsf:v h264_mp4toannexb -f mpegts "tls://localhost:8888?listen&cert=server-cert.pem&key=server-privatekey.pem"
  
  
  
  
  
  sudo ffplay -f mpegts "tls://localhost:8888"

• Revision 33026 : Ajout des classes mots, breves, auteurs ... dans les extras

  17 novembre 2009, par shnoulle@… — Log

  Ajout des classes mots, breves, auteurs ... dans les extras