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• how to build ffmpeg with librist ?

  9 janvier 2023, par SleepingBug

  how to build ffmpeg with librist ?

  


  I cannot find any useful thing to do it.

  


  I run a sh file in minGW on Windows as below :

  


  `./configure\
 --prefix=/home/source/ffmpeg/build/ffmepg-5.1\
 --arch=x86_64\
 --enable-shared\
 --enable-gpl\
 --enable-libfdk-aac\
 --enable-nonfree\
 --enable-libvpx\
 --enable-libx264\
 --enable-libx265\
 --enable-libmp3lame\
 --enable-librist\
 --extra-cflags="-I/home/source/build/libfdk-aac/include"\
 --extra-ldflags="-L/home/source/build/libfdk-aac/lib"\
 --extra-cflags="-I/home/source/build/libvpx/include"\
 --extra-ldflags="-L/home/source/build/libvpx/lib"\
 --extra-cflags="-I/home/source/build/libx264/include"\
 --extra-ldflags="-L/home/source/build/libx264/lib"\
 --extra-cflags="-I/home/source/build/libx265/include"\
 --extra-ldflags="-L/home/source/build/libx265/lib"\
 --extra-cflags="-I/home/source/build/libmp3lame/include"\
 --extra-ldflags="-L/home/source/build/libmp3lame/lib"\
 --extra-cflags="-I/home/source/librist/build/include"\
 --extra-cflags="-I/home/source/librist/include/librist"\
 --extra-cflags="-I/home/source/librist/include"\
 --extra-ldflags="-L/home/source/librist/build/"`


  


  the error is :
ERROR : librist >= 0.2.7 not found using pkg-config

  


  If you think configure made a mistake, make sure you are using the latest
version from Git. If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.libera.chat.
Include the log file "ffbuild/config.log" produced by configure as this will help
solve the problem.

  


  ==================

  


  I have downloaded the latest librist source code !

  


  if I remove "—enable-librist" , everything is OK, but there is no librist in ffmpeg...

  


  build ffmpeg with librist

  


• Video Conferencing in HTML5 : WebRTC via Socket.io

  
  1er janvier 2014, par silvia

  Six months ago I experimented with Web sockets for WebRTC and the early implementations of PeerConnection in Chrome. Last week I gave a presentation about WebRTC at Linux.conf.au, so it was time to update that codebase.

  I decided to use socket.io for the signalling following the idea of Luc, which made the server code even smaller and reduced it to a mere reflector :

   var app = require(’http’).createServer().listen(1337) ;
   var io = require(’socket.io’).listen(app) ;
   io.sockets.on(’connection’, function(socket) 
  
           socket.on(’message’, function(message) 
  
           socket.broadcast.emit(’message’, message) ;
  
       ) ;
  
   ) ;
  

  Then I turned to the client code. I was surprised to see the massive changes that PeerConnection has gone through. Check out my slide deck to see the different components that are now necessary to create a PeerConnection.

  I was particularly surprised to see the SDP object now fully exposed to JavaScript and thus the ability to manipulate it directly rather than through some API. This allows Web developers to manipulate the type of session that they are asking the browsers to set up. I can imaging e.g. if they have support for a video codec in JavaScript that the browser does not provide built-in, they can add that codec to the set of choices to be offered to the peer. While it is flexible, I am concerned if this might create more problems than it solves. I guess we’ll have to wait and see.

  I was also surprised by the need to use ICE, even though in my experiment I got away with an empty list of ICE servers – the ICE messages just got exchanged through the socket.io server. I am not sure whether this is a bug, but I was very happy about it because it meant I could run the whole demo on a completely separate network from the Internet.

  The most exciting news since my talk is that Mozilla and Google have managed to get a PeerConnection working between Firefox and Chrome – this is the first cross-browser video conference call without a plugin ! The code differences are minor.

  Since the specification of the WebRTC API and of the MediaStream API are now official Working Drafts at the W3C, I expect other browsers will follow. I am also looking forward to the possibilities of :

  • multi-peer video conferencing like the efforts around webrtc.io,
  • the media stream recording API,
  • and the peer-to-peer data API.

  The best places to learn about the latest possibilities of WebRTC are webrtc.org and the W3C WebRTC WG. code.google.com has open source code that continues to be updated to the latest released and interoperable features in browsers.

  The video of my talk is in the process of being published. There is a MP4 version on the Linux Australia mirror server, but I expect it will be published properly soon. I will update the blog post when that happens.

• FFmpeg hevc_nvenc encoder B Frame problem

  16 mai 2023, par ramondq

  I'm using the latest FFmpeg windows Build (2022-12-02 12:44) from BtbN.
I'm trying to encode a video into HEVC codec using hevc_nvenc encoder. But it says [hevc_nvenc @ 00000263983f4280] B frames as references are not supported. Cause my GPU GTX1060 (GP106) doesn't support hardware accelerate encode HEVC of B frames.
command line

  


  I tried to disable the B frames by adding the parameter -bf 0, but it doesn't work.
Then I tried to use the latest build from gyan.dev and it is the same. But when I tried to use an older build (2021-02-28 12:32) of BtbN, it doesn't have the problem.
Is there a workaround to bypass this B frame problem ? Cause I don't want to switch to an older build. Thanks.