Encoding digital silence can result in very low-level noise
In a scenario where speech is followed by digital silence (for example in a VoIP application where the user might mute their microphone), and DTX is disabled, it seems that the Opus encoder (and/or decoder) generates very low-level noise. I am not sure whether this is a known, and potentially expected/desired behaviour, but I thought I would report it anyway. It feels that it would be nice if the transcoded output in this case could still be pure silence. Could you please comment? Many thanks.
Steps to reproduce (environment: Linux Ubuntu 18.04 64-bit, Opus 1.3.1): ./autogen.sh ./configure --enable-fixed-point --disable-doc --with-pic ./opus_demo voip 16000 1 64000 speech_and_silence.raw speech_and_silence_output.raw