rtpopuspay: add DTX support
If enabled, the payloader won't transmit empty frames.
Can be tested using: opusenc dtx=true bitrate-type=vbr ! rtpopuspay dtx=true
If enabled, the payloader won't transmit empty frames.
Can be tested using: opusenc dtx=true bitrate-type=vbr ! rtpopuspay dtx=true