Bitrate and sampling rate issues in v4l2rtspserver-master about main HOT 2 OPEN

Opus supports 5 input sample rates 8k, 12k, 16k, 24k, and 48k. If you set the encoder to a 48k input sample rate and then feed it 44.1k sampled data it will accept it and just map it directly into the 48k space which will cause audio quality issues. If you set the input rate to 44.1k and output to 48k in lame it will resample the input to the 48k rate. Opus does have specific support for voice which gives it the possibility of delivering better voice legibility than mp3. NIST did some studies of various low bandwidth codecs testing for voice legibility in the presence of background noises which would typically be experienced by first responders. For instance alarms and sirens. Opus tested very well under these conditions. Even if it only produces equivalent sound quality as mp3 it will do so while using much lower bandwidth. I'm wrapping up a PR to upgrade the version wpa_supplicant because the version shipped with the cameras is vulnerable to KRACK attacks. I'll hopefully get that submitted tomorrow and then after the weekend start looking at getting some PRs submitted regarding the audio.