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• How to change subtitle's color & add background to it with mencoder/ffmpeg command line tools ?

  4 septembre 2014, par AliGH

  I want to burn a subtitle file with .srt format in Persian (-utf8) into a video file with .mp4 format using mencoder. I’m using ubuntu 14.04. This command works for the simple task of burning subtitle on video file :

  sudo mencoder input.mp4 -sub subtitle.srt -utf8 -o output.mp4 -oac pcm -ovc lavc

  Now I want to change the color and font size of subtitle, and also add background for the subtitle. I’ve seen some commands here, like -ass-color <value></value> , -sub-bg-color but They don’t work together. -sub-bg-color works when I import the .srt file, and -ass-color works with .ass format. Also I don’t want to convert .srt files to .ass.
  Does anyone know how can I complete this line of command to do these changes I mentioned above ?

  Any equal command in ffmpeg is also wellcomed. I’m using mencoder just to avoid messing up with ffmpeg compiling process.

• Revision e590e087d5 : Fix target frame size setting, for 1pass cbr. Only use layered average size if

  13 février 2014, par Marco Paniconi

  Changed Paths :
   Modify /examples/vpx_temporal_scalable_patterns.c

  
   Modify /vp9/encoder/vp9_ratectrl.c

  
  
  Fix target frame size setting, for 1pass cbr.

  Only use layered average size if number_temporal_layers > 1.

  Also removed unneeded commented-out line, and change some parameter
  setting in vpx_temporal_scalable_patterns.c

  Change-Id : Ic86e43e7daf0313e8c5a4aba1497299158111955

• FFMPEG Stream series of pictures over network

  11 septembre 2015, par Commodore63

  I would like to generate video frames on one computer and stream them to another computer to be manipulated and displayed. I want to do this programatically, because the source images are generated from a 3rd party c++ library and on the receiving end I want to manipulate the images before displaying them. I have been pulling my hair out trying FFMPEG. I got the encoding example to work, but am not sure what to do after that. I have just about googled everything i could think of but cannot figure out which FFMPEG library/function to call once I have a stuffed AVPacket. It seems that I need to use either the AVIO or AVFormat or the muxer but it is not clear how to initialize and get them working. I would appreciate any help you could offer.

  To provide some context I have the example ’decoding_encoding.c’ which is provided with ffmpeg working. Here is the spot that I am struggling with :

          /* encode the image */
  
          ret = avcodec_encode_video2(c, &pkt, frame, &got_output);
  
          if (ret < 0) {
  
              fprintf(stderr, "Error encoding frame\n");
  
              exit(1);
  
          }
  
  
  
          if (got_output) {
  
              printf("Write frame %3d (size=%5d)\n", i, pkt.size);
  
              fwrite(pkt.data, 1, pkt.size, f);
  
  
  
              //
  
              // instead of writing to a file, i want to stream to a network
  
              // What do I need to do with pkt to do that?
  
              //
  
              av_free_packet(&pkt);
  
          }

  Most documentation (and the Dranger tutorial) focus on reading and writing files. I do not need to use a file. I want to stream video over a network. It seems like I need AVFormat and AVio but I jsut can’t figure out how they fit together.