Saturday, January 29, 2011

cross-platform GUI starter project

Since MLT is now working on Mac OS X, Windows, Linux, and BSD, I added a cross-platform C++ Qt starter project to the git repository:

It is just a very simple media player with menu, toolbar, status bar, and video frame. The build system is qmake, which is very convenient to use with the cross-platform Qt Creator tool. The code includes the special OpenGL playout widget needed for Mac OS X. It is licensed under the liberal MIT open source license. On OS X, BSD, and Linux, it uses pkg-config to locate the MLT dependencies. Therefore, on OS X, the easiest way to get up and running is to use the mlt port. On Windows, a couple of extra steps are needed to copy files from the mlt build area to the Qt project build area.

Monday, January 24, 2011

Windows compatibility and parallelism merged

Just as 2010 came in strong, so does 2011! The work on Windows compatibility and the parallel consumer have been merged into master. I plan to release these after a month or so of additional testing.

version 0.6.2 released

This is just a minor release to address a few things prior to introducing major changes from other branches.

  • Added force_aspect_ratio property to pixbuf and qimage producers.
  • Added opacity handling in geometry property of the affine filter and transition.
  • Added use_normalised property to affine filter.
  • Added always_active property to affine transition.
  • Fix building on NetBSD.

Sunday, January 2, 2011

version 0.6.0 released

There were quite a few enhancements and changes including a minor interface change. Therefore, this release gets a jump in the versioning.


  • mlt_profile
    • Added (Y'CbCr) colorspace attribute.
    • Added mlt_profile_clone().
  • Added mlt_consumer_position() and Mlt::Consumer::position().
  • Added Mlt::Properties::wait_for(string).
  • Added a version API: mlt_version_get_int() and others.
  • Added Mlt::Producer::pause().
  • Added mlt_frame_write_ppm() for debugging.


  • Added automatic detection of profile from first input when profile not specified.
  • Now exits with error result when consumer fails fatally.


  • Added swfdec producer for Flash files including variables support. (Does not support audio.)
  • Added consumer for Blackmagic Design DeckLink SDI and Intensity HDMI.
  • Added Y'CbCr colorspace conversion and option to use full luma range.
  • Added (de)serialization of profile to XML.
  • Added support for #frame# variable to the data_show filter.
  • Added support for frei0r string parameters.
  • Make FFmpeg formats and codecs available as properties (not just stderr).
  • Try to load .xml file as MLT XML.
  • Added a consumer-sdl-paused event to sdl_preview.
  • Added a consumer-fatal-error event to avformat.
  • Change composite transition to default to progressive rendering; field-based rendering available only explicitly.