Get parameter defaults from frei0r.
Merge pull request #15 from eddrog/master

register jack ports before activating client
Fix build on libav master by adopting new API constants.
pixbuf: let begin property be passed as a query string parameter
fix query string on producer specification preventing extension mapping
pixbuf: support alt. query syntax begin:value for melt
qimage: let begin property be passed as a query string parameter
calc image size as largest of two image size calculation methods
Fix kdenlivetitle producer position
Fix indentation
Merge pull request #17 from j-b-m/master

Fix kdenlivetitle producer position
fix leak on allocated sax context
reorder startup/stopping preroll thread
partially fix leak of service allocated in on_start_xxx
producer_xml: fix leak of consumer service
producer_xml: fix proper initialization of consumer
Extend fix for audio encoding distortion to flush stage. (3576437)
Aspect ratio fix in affine transition.
Fix uninitialized pointer read. (coverity-743163)
Fix dereference before null check. (coverity-743162)