Opus encoding fixes
The MR contains the following changes.
- To warn ( rather than rb_debug ) for various error scenarios while setting the encoding style of the gstreamer encoder element.
- Replace deprecated properties for
opusenc
encoder.
Refer: https://bugzilla.gnome.org/show_bug.cgi?id=744909
Refer: https://bugzilla.gnome.org/show_bug.cgi?id=756282
Closes: #1634 (closed)
- Add constrained vbr support and enable it for opus encoder alone for the moment.