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• Transcoding wmv file to mp4 using Jave

  17 mai 2013, par Fawkes

  I am trying to use Jave to convert a wmv file into h264(mp4).
  The final version created by Jave plays fine with VLC player but when I try to use it inside the HTML5 video tag, it is not able to play the file.

  I am guessing that the issue is with the attributes I am setting for the video attributes.

  Java Code :
  

      videoAttributes.setCodec("mpeg4");
  
      videoAttributes.setTag("mpeg4");
  
      videoAttributes.setBitRate(new Integer(5000));
  
      videoAttributes.setFrameRate(new Integer(30));
  
      videoAttributes.setSize(new VideoSize(512, 384));
  
      encodingAttributes.setVideoAttributes(videoAttributes);
  
      encodingAttributes.setFormat("mp4");

  HTML code :

      <video controls="true" width="400" height="200">
  
          <source src="path_to_converted_mp4_file" type="video/mp4"></source>
  
          Not Supported
  
      </video>

• Libav/FFmpeg and Google Summer of Code 2012

  26 avril 2012, par Multimedia Mike — General, ffmpeg, gsoc, gsoc2012, hevc, libav, opus, rtmp, ut video

  So, the projects are participating in the Google Summer of Code for the 2012 season. (While Libav is the project officially accepted to particular, I still refer to the projects because FFmpeg will also benefit).

  Here are the students, projects, and mentors for this summer :

  1. Andrew D’Addesio is working on an Opus Decoder, mentored by Justin Ruggles
  2. Guillaume Martres is working on an HEVC video decoder, mentored by Mashiat Sarker Shakkhar
  3. Jan Ekström is working on an LGPL Ut Video encoder, mentored by Kostya Shishkov
  4. Jordi Ortiz is working to rewrite avserver, mentored by Luca Barbato
  5. Samuel Pitoiset is working on an RTMP[E|S|T|TE] protocol implementation, mentored by Martin Storsjö

  Wish them luck– these are some ambitious projects.

• Releasing GME Players and Tools

  22 mai 2012, par Multimedia Mike — General, alsa, github, gme, pulseaudio, Python, sdl

  I just can’t stop living in the past. To that end, I’ve been playing around with the Game Music Emu (GME) library again. This is a software library that plays an impressive variety of special music files extracted from old video games.

  I have just posted a series of GME tools and associated utilities up on Github.

  Clone the repo and try them out. The repo includes a small test corpus since one of the most tedious parts about playing these files tends to be tracking them down in the first place.

  Players
  At first, I started with trying to write some simple command line audio output programs based on GME. GME has to be the simplest software library that it has ever been my pleasure to code against. All it took was a quick read through the gme.h header file and it was immediately obvious how to write a simple program.

  First, I wrote a command line tool that output audio through PulseAudio on Linux. Then I made a second program that used ALSA. Guess what I learned through this exercise ? PulseAudio is actually far easier to program than ALSA.

  I also created an SDL player, seen in my last post regarding how to write an oscilloscope. I think I have the A/V sync correct now. It’s a little more fun to use than the command line tools. It also works on non-Linux platforms (tested at least on Mac OS X).

  Utilities
  I also wrote some utilities. I’m interested in exporting metadata from these rather opaque game music files in order to make them a bit more accessible. To that end, I wrote gme2json, a program that uses the GME library to fetch data from a game music file and then print it out in JSON format. This makes it trivial to extract the data from a large corpus of game music files and work with it in many higher level languages.

  Finally, I wrote a few utilities that repack certain ad-hoc community-supported game music archives into... well, an ad-hoc game music archive of my own device. Perhaps it’s a bit NIH syndrome, but I don’t think certain of these ad-hoc community formats were very well thought-out, or perhaps made sense a decade or more ago. I guess I’m trying to bring a bit of innovation to this archival process.

  Endgame
  I haven’t given up on that SaltyGME idea (playing these game music files directly in a Google Chrome web browser via Google Chrome). All of this ancillary work is leading up to that goal.

  Silly ? Perhaps. But I still think it would be really neat to be able to easily browse and play these songs, and make them accessible to a broader audience.