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• Output a Java window as a webcam stream

  15 juin 2012, par Zac

  I would like to write a program perferably in Java that can display animated overlays on a screen.

  The screen will then be broadcast streamed over the internet using a separate program called x-split.

  A good way to do this would be to create a transparent window in java which will display animated files (with transparancy) and the output of this window (Its display) should ideally appear in the webcam device list so it can be easily picked up by x-split which will allow it to be arranged ontop of the game screen I'm currently broadcasting.

  An example program of this type would be one where a webcam image is displayed and "virtual glasses" overlayed over the image of a persons face which could then be transmitted as an output cam.

  I have found the java 6u10-translucent-shapes library to create the transparent window but I don't know how to stream it.

  I've read a few things to suggest that JMF and FFMpeg might be the way to go, but I'm not sure what to install and how.

  Any help or pointers to tutorials would be greatly appreciated.

• Set H264 high quality encoding in FFMPEG

  25 décembre 2015, par hiitiger

  I’m working on a function, using ffmpeg to encode a serial images to a MP4 file.
  I use H264 codec, and want to have a high quality output.

  Other things now goes well, but the video quality looks obvious loss.

  After some Google, I set codec context like this

  video_st = avformat_new_stream(oc, 0); 
  
  ....
  
  pVideoCodec  = avcodec_find_encoder(fmt->video_codec); //AV_CODEC_ID_H264
  
  ....
  
  avcodec_get_context_defaults3(video_st->codec, pVideoCodec);
  
  video_st->codec->codec_id =  fmt->video_codec;
  
  video_st->codec->width = m_outWidth;
  
  video_st->codec->height = m_outHeight;
  
  video_st->codec->time_base.den = m_fps;
  
  video_st->codec->time_base.num = 1;
  
  video_st->codec->pix_fmt = AV_PIX_FMT_YUV420P;
  
  
  
  AVDictionary *param = nullptr;
  
  av_dict_set(&param, "qp", "0", 0);
  
  av_dict_set(&param, "preset", "medium", 0);

  I also try to set bit_rate. But all turned out to be bad.

  I want a visually loss less output video.

  So what parameters should I set or anything else did I missed ?

• avutil/pixfmt : improve definition of AVColorRange

  18 septembre 2020, par Jan Ekström

  avutil/pixfmt : improve definition of AVColorRange
  As it was brought up that the current documentation leaves things
  
  as specific to YCbCr only, ICtCp and RGB are now mentioned.
  
  Additionally, the specifications on which these definitions of
  
  narrow and full range are defined are mentioned.
  This way, the documentation of AVColorRange should now match how
  
  most people seem to read interpret it at this point, and thus
  
  flagging RGB AVFrames as full range is valid not only according to
  
  common sense, but also the enum definition.
  

  • [DH] libavutil/pixfmt.h