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• video streaming using recent frames only

  30 juillet 2019, par Max Paython

  I am trying to create a live video chat application, I am dealing with latency problems but these problems are not produced by encoding or overhead, rather from the definition of streaming itself.

  For example if I start the client program 15 seconds after the server program (start listening the port 15 seconds late), the client tries the play the 15 second old stream. (and fails because of the lack of I-frames introduced by x264 zero-latency, but this is not important)

  But I am trying to make it live. Old frames should be discarded and and the most recent frame should be showing (to a 1 second buffer maybe). I failed at doing this so I wanted to wait streaming until the peer is connected, but my goal is actually the first one.

  I am using ffmpeg for streaming. Can ffmpeg wait streaming until a single client starts listening (or connects) the port.

  How does applications like Skype or Hangouts handle this ? In these applications, if a user suddenly stops listening to the port (internet error for example) for 5 seconds, the chat will continue regularly after the connections is restored, and that user will not see the 5 second old frame but the new one. However I was not able to achieve this.

• Deinterlace a frame with ffmpeg 5.1

  22 novembre 2022, par jd750

  I have been searching on the internet how to deinterlace a frame with Ffmpeg 5.1. Every solution I found are for old versions of Ffmpeg. Those solutions are not working for Ffmpeg 5.1 because of deprecated classes or functions that have been removed from the newest version. In version 2.1 of Ffmpeg we used to have :

  


  int avpicture_deinterlace(AVPicture* dst,
const AVPicture * src,
enum AVPixelFormat pix_fmt,
int width,
int height 
)   


  


  Now I'm looking to implement a similar function but with AVFrame instead

  


  int avframe_deinterlace(AVFrame* dst
const AVFrame* interlacedFrame,
enum AVPixelFormat pix_fmt,
int width,
int height 
)   


  


  But I don't know how to do it !
I've started to look at the documentation and it would take me weeks to implement it.
In the mean time I'll try to do it by myself but help would be appreciated.

  


  I'm looking for how to deinterlace a frame programmatically with Ffmpeg 5.1. More specifically how to implement this function :

  


  int avframe_deinterlace(AVFrame* dst
const AVFrame* interlacedFrame,
enum AVPixelFormat pix_fmt,
int width,
int height 
)   


  


• Anomalie #2996 (Nouveau) : carré de couleur d’indication manquant, sous certains navigateurs

  12 mai 2013, par Franck Dalot

  Bonsoir
  SPIP 3.0.8 [20512]
  Windows 7

  En répondant à http://core.spip.org/issues/2995 je me suis rendu compte que à parts sous Firefox, le carré de couleur indiquant le statut d’un article est absent.
  Le pourtour est bien présent et change bien, mais suivant le navigateur, il manque le petit carré à côté de "publié en ligne" par exemple.

  Pareil rien de bien important, en tout cas rien ne demandant forcément une correction, mais bon pendant que j’y suis suis et que en plus, je suis bien certain que dans les docs cela en parle, j’en profite pour le dire.

  J’ai fait des copies d’écrans pour être plus simple à comprendre.
  Sous :
  Internet Explorer 9
  Firefox 20.0.1
  Chrome 26.0.1410.64 m
  Opéra 12.15

  Cordialement, Franck