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• 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.

• avcodec/utils : only warn when passed invalid lowres value

  5 août 2016, par Aman Gupta

  avcodec/utils : only warn when passed invalid lowres value
  This makes it easier to use the lowres option when dealing with input
  
  files in different codecs. If the codec doesn’t support lowres=1 for
  
  instance, it will throw a warning and use lowres=0 instead of erroring
  
  out completely.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/utils.c