GLMixer Code

Added request for OpenGL extension GL_EXT_gpu_shader4 as required.

Creation of the SessionSwitcher class to control the transitions independently from the output render window. This allows to RECORD transitions. The new process is implemented into the rendering manager and this required quite some changes in the rendering process. Some sanity fixes have been made on the way.

Added two masks (horizontal and vertical bars). Fixed a recording bug.

Improvement of GL updating mechanism by making glRenderWidget (child also) instances update simultaneously on a static global clock (QTimer).

Ensure compatibility with different versions of ffmpeg lib (avcodec & avformat).

Fixed memory management (use av_free instead of free), and adapt code to avoid DEPRECATED avcodec and swscale functions.

Edited wiki page Compilation through web user interface.

Edited wiki page Compilation through web user interface.

No need for QElapsedTimer which is not available in all versions of Qt : using QTime is enough.

Improvement of the recording of the output: implementation of a THREAD for performing the avcodec encoding, using a queue of pictured filled from opengl and encoded in parallel. Added warning for low frame rate recording.