get ImageDesc from VideoDesc
clean get video metadatas
first opengl display
update player
adding metadata factoring, and easy clock
stating increase read performances
Merge branch 'develop' of github.com:MarcAntoine-Arnaud/avTranscoder into develop

Conflicts:
	app/SConscript
Merge branch 'develop'

Conflicts:
	app/SConscript
clean read, using same InputFile for streams, need to bufferize if read stream
refactoring player code in C++
start adding seek in file
adapt Transcoder to opening minimal number of files
remove print message
addin dummy input file for silence audio generating
asdding profile managment and method to get delayed coded frames
seek before and after get properties on media
minor refactoring
Merge branch 'master' of github.com:MarcAntoine-Arnaud/avTranscoder
removing some build warnings and some pointer to references
update config file for drone io