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• Passing pointer to thread via message_loop

  21 août 2016, par Mohammad Abu Musa

  I am using FFMPEG to encode a video, I got a green screen for the packets which I think it means I am getting empty buffer. I suspect I am passing the parameters wrong. I want help in getting the parameters passed correctly.

      vpx_codec_iter_t iter = NULL;
  
      const vpx_codec_cx_pkt_t *pkt;
  
      // copy the pixels into our "raw input" container.
  
      int bytes_filled = avpicture_fill(&pic_raw, data, AV_PIX_FMT_YUV420P, out_width, out_height);
  
      if(!bytes_filled) {
  
          Logger::Log("Cannot fill the raw input buffer");
  
          return;
  
      }
  
  
  
      if(vpx_codec_encode(&codec, &raw, frame_cnt, 1, flags, VPX_DL_REALTIME))
  
            die_codec(&codec, "Failed to encode frame");
  
  
  
      while( (pkt = vpx_codec_get_cx_data(&codec, &iter)) ) {
  
          switch(pkt->kind) {
  
              case VPX_CODEC_CX_FRAME_PKT:
  
                  glb_app_thread.message_loop().PostWork(callback_factory_.NewCallback(&EncoderInstance::write_ivf_frame_header, pkt));
  
                  glb_app_thread.message_loop().PostWork(callback_factory_.NewCallback(&EncoderInstance::WriteFile, pkt));
  
                  break;
  
              default:break;
  
          }
  
      }

  for the event handler

  void EncoderInstance::WriteFile(int32_t result, const vpx_codec_cx_pkt_t *pkt){
  
      lock_file_.Acquire();
  
      (void) fwrite(pkt->data.frame.buf, 1, pkt->data.frame.sz, outfile);
  
      Logger::Log("Packet written");
  
      lock_file_.Release();
  
  
  
  }

  My question is, am I passing the argument pkt correctly ? or should I put these packets into a queue then let the writeFile function work on the queue.

• FFMPEG Green Screen from raw pictures

  21 août 2016, par Mohammad Abu Musa

  I am writing a screen recorder, I get raw data from Chrome and I want to covert it to webm files. I manged successfully to export the videos with the correct periods but the issue that I get a green screen instead of the screen capture. I am not sure what could be wrong.

  Is it writing to file ? or passing the parameters to fwrite function ?

  void EncoderInstance::OnGetFrame(int32_t result, pp::VideoFrame frame) {
  
      if (result != PP_OK)
  
          return;
  
  
  
      const uint8_t* data = static_cast<const>(frame.GetDataBuffer());
  
      pp::Size size;
  
      frame.GetSize(&amp;size);
  
      uint32_t buffersize = frame.GetDataBufferSize();
  
  
  
  
  
      if (is_recording_) {
  
          vpx_codec_iter_t iter = NULL;
  
          const vpx_codec_cx_pkt_t *pkt;
  
          // copy the pixels into our "raw input" container.
  
          int bytes_filled = avpicture_fill(&amp;pic_raw, data, AV_PIX_FMT_YUV420P, out_width, out_height);
  
          if(!bytes_filled) {
  
              Logger::Log("Cannot fill the raw input buffer");
  
              return;
  
          }
  
  
  
          if(vpx_codec_encode(&amp;codec, &amp;raw, frame_cnt, 1, flags, VPX_DL_REALTIME))
  
                die_codec(&amp;codec, "Failed to encode frame");
  
  
  
          while( (pkt = vpx_codec_get_cx_data(&amp;codec, &amp;iter)) ) {
  
              switch(pkt->kind) {
  
                  case VPX_CODEC_CX_FRAME_PKT:
  
                      glb_app_thread.message_loop().PostWork(callback_factory_.NewCallback(&amp;EncoderInstance::write_ivf_frame_header, pkt));
  
                      glb_app_thread.message_loop().PostWork(callback_factory_.NewCallback(&amp;EncoderInstance::WriteFile, pkt));
  
                      break;
  
                  default:break;
  
              }
  
          }
  
  
  
          frame_cnt++;
  
      }
  
  
  
      video_track_.RecycleFrame(frame);
  
      if (need_config_) {
  
          ConfigureTrack();
  
          need_config_ = false;
  
      } else {
  
          video_track_.GetFrame(
  
                  callback_factory_.NewCallbackWithOutput(
  
                          &amp;EncoderInstance::OnGetFrame));
  
      }
  
  }
  
  </const>

• html5 video wont play ANY mp4 encodes on ipad

  9 septembre 2016, par nickg

  Im trying to embed a mp4 on a page with the HTML5 video tag. Everything works fine on Desktop but nothing will work on an iPad Version 9.3.4.
  I have the mime types in an .htaccess file. I’ve tried various encodes with handbrake, Miro and FFmpeg conversions.

  Even sample videos like at w3schools and videojs don’t play.
  The video will play if i actually sync it to the iPad, but nothing works over the web. An older iPad actually plays mp4s through the HTML5 video player.
  I’m ready to throw this POS iPad through a window.

   <video autoplay="false" width="320" height="240" controls="true">
  
    <source src="http://webnamehere.com/video/bunny.mp4" type="video/mp4; codecs=&quot;avc1.42E01E, mp4a.40.2&quot;">
  
  
  
  Your browser does not support the video tag.
  
  </source></video>

  Has anyone found a way to fix this ? Is there ANY encoding that this thing will actually play ? Thank you in advance for any help.