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• Removed client singleton pattern.

  9 janvier 2014, par JamesMGreene

  Removed client singleton pattern.
  Deprecated lots of functions related to the v2.x API ; details in Issue #289.
  Fixes #90.
  

• ffmpeg/h265/opencv/c++ A method to resize frame after decoding on client side

  18 janvier 2018, par 8793

  I’ve just joined a project to build a realtime video streaming application using ffmpeg/opencv/c++ via udp socket. On server side, they want to transmit a video size (640x480) to client, in order to reduce data transmission through network I resize the video to (320x240) and send frame. On client side (client), after receiving frame, we will upscale the frame back to (640x480). Using H265 for encode/decoding.

  As I am just a beginner with video encoding, I would like to understand how to down-sampling & up-sampling the frame at server & client side in which we can incorporate with the video encoder/decoder.

  A simple idea came into my mind that after decoding avframe -> Mat frame, I will upsampling this frame then display it.

  I am not sure my idea is right or wrong. I would like to seek advice from any people who had experience in this area. Thank you very much !

  static void updateFrameCallback(AVFrame *avframe, void* userdata) {
  
      VideoStreamUDPClient* streamer = static_cast (userdata);
  
      TinyClient* client = static_cast (streamer->userdata);
  
  
  
      //Update Frame
  
      pthread_mutex_lock(&client->mtx_updateFrame);
  
      if (streamer->irect.width == client->frameSize.width
  
              && streamer->irect.height == client->frameSize.height) {
  
          cvtAVFrameYUV4202Frame(&avframe, client->frame);
  
          printf("TinyClient: Received Full Frame\n");
  
      } else {
  
          Mat block;
  
          cvtAVFrameYUV4202Frame(&avframe, block);
  
          block.copyTo(client->frame(streamer->irect));
  
      }
  
  
  
      //How to resize frame before display it!!!
  
  
  
      imshow("Frame", client->frame);
  
      waitKey(1);
  
      pthread_mutex_unlock(&client->mtx_updateFrame);
  
  }

• FFMPEG - how to convert large file to much smaller file to view on LG smart TV

  18 juin 2019, par PAW

  I have edited a home movie thru Davinci Resolve and the output has been rendered/saved on my PC. For some strange reason it seems huge and nothing will play it (apart from within Resolve itself) and none of my conversion software will convert it from the huge file to something smaller I can watch on my LG smart TV (handbrake, video converter).

  I downloaded FFMPEG and installed it, then ran a command to examine the file. Results posted here. Does this mean that FFMPEG has found the codec and I can convert it ? and has anyone any suggestions on what to convert it to ?

  Many thanks

  ffmpeg -i C:\Users\PAW\Videos\Resolve\untitled.mov
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Users\PAW\Videos\Resolve\untitled.mo
  
  v':
  
  
  
    Metadata:
  
  
  
      major_brand     : qt
  
      minor_version   : 512
  
      compatible_brands: qt
  
      encoder         : Lavf57.25.100
  
  
  
  Duration: 01:09:43.81, start: 0.000000, bitrate: 390431 kb/s
  
      Stream #0:0(eng): Video: dnxhd (DNXHR 444) (AVdh / 0x68645641), yuv444p12le(
  
  tv, bt709/unknown/unknown), 1280x720, 388894 kb/s, 59.94 fps, 59.94 tbr, 60k tbn
  
  , 60k tbc (default)
  
  
  
      Metadata:
  
        handler_name    : Core Media Data Handler
  
        timecode        : 01:00:00:00
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s1
  
  6, 1536 kb/s (default)
  
      Metadata:
  
        handler_name    : Core Media Data Handler
  
      Stream #0:2(eng): Data: none (tmcd / 0x64636D74)
  
      Metadata:
  
        handler_name    : Core Media Data Handler
  
        timecode        : 01:00:00:00