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• lavc/codec_desc : add a property for codecs that support field coding

  5 mai 2023, par Anton Khirnov

  lavc/codec_desc : add a property for codecs that support field coding
  Multiple places currently use AVCodecContext.ticks_per_frame > 1 to
  
  identify such codecs, which
  
  * requires a codec context
  
  * requires it to be open
  

  • [DH] doc/APIchanges
  • [DH] libavcodec/codec_desc.c
  • [DH] libavcodec/codec_desc.h
  • [DH] libavcodec/version.h

• Using ffmpeg to convert audio from Red5

  19 août 2014, par Chintan Patel

  I am facing some problems in my project.

  In my project, I need to implement microphone integration with RED5 server using Actionscript which is used to store the audio stream on server and after that I used ffmpeg in java code to convert the flv file to mp3.

  I am facing 2 problems here :

  1. The recorded audio creates .flv file which is currepted.

  2. When I try to convert the .flv to .mp3 using ffmpeg, it gets stuck until I stop the Red5 server.

  Here is my code of both places. Please let me know where I am doing wrong.

  Actionscipt to record microphone audio and stream on red5 :

  private function initConnection():Void {
  
  
  
          trace("Connecting...");
  
  
  
          nc = new NetConnection();
  
          nc.client = this;
  
          nc.addEventListener(NetStatusEvent.NET_STATUS, onNetConnectionStatus);
  
          nc.connect("rtmp://127.0.0.1/test");
  
  
  
          this.mic = Microphone.getMicrophone();
  
  
  
          if (this.mic != null) {
  
              this.mic.rate = 44;
  
              mic.setSilenceLevel(0);
  
              mic.gain = 100;
  
              mic.setUseEchoSuppression(true); 
  
              mic.setLoopBack(true);              
  
          }                   
  
      }

  To Send on Red5 :

  public function startSending( nc: NetConnection, filename:String ) {
  
          ns = new NetStream(nc);
  
          ns.addEventListener(NetStatusEvent.NET_STATUS, onNetStreamStatus);
  
          ns.publish(filename, 'record');
  
          ns.attachAudio(mic);        
  
  }

  To Stop recording/sending :

  public function stopSending() {
  
          mic.setLoopBack(false);
  
          ns.attachAudio(null);
  
          ns.close();     
  
  }

  The resulting .flv stored on server which is currepted.

  Not to convert .flv into .mp3, I have used ffmpeg in my Java code as per following :

  String ffmpegArgs[] = {executableDir,"-i",flvFile.getAbsolutePath(), "-vn", mp3File.getAbsolutePath()};
  
  Process process = new ProcessBuilder(Arrays.asList(ffmpegArgs)).start();

  This starts the file conversion, but it gets stucked. After some time when I stop the server, it immediately shows the converted file.
  Please let me know, where I am doing wrong.

• avcodec/hevc_filter : Pass HEVCLocalContext when slice-threading

  29 juin 2022, par Andreas Rheinhardt

  avcodec/hevc_filter : Pass HEVCLocalContext when slice-threading
  The HEVC decoder has both HEVCContext and HEVCLocalContext
  
  structures. The latter is supposed to be the structure
  
  containing the per-slicethread state.
  Yet that is not how it is handled in practice : Each HEVCLocalContext
  
  has a unique HEVCContext allocated for it and each of these
  
  coincides with the main HEVCContext except in exactly one field :
  
  The corresponding HEVCLocalContext.
  
  This makes it possible to pass the HEVCContext everywhere where
  
  logically a HEVCLocalContext should be used.
  This commit stops doing this for lavc/hevc_filter.c ; it also constifies
  
  everything that is possible in order to ensure that no slice thread
  
  accidentally modifies the main HEVCContext state.
  There are places where this was not possible, namely with the SAOParams
  
  in sao_filter_CTB() or with sao_pixels_buffer_h in copy_CTB_to_hv().
  
  Both of these instances lead to data races, see
  
  https://fate.ffmpeg.org/report.cgi?time=20220629145651&slot=x86_64-archlinux-gcc-tsan-slices
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/hevc_filter.c
  • [DH] libavcodec/hevcdec.c
  • [DH] libavcodec/hevcdec.h