Lynne's compiled musings

https://github.com/cyanreg https://pars.ee/@lynne

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IRC: Lynne

20-10-06

Low bitrate white noise?

"Every collection of random bits is white noise.".

"Every collection of random bits is a valid Opus packet.".

But is every collection of random bits a valid Opus packet which decodes to white noise1? Here are two volume-reduced2 16kbps samples.

Encoded white noise (volume set to 5.37%) Random bytes (volume set to 0.28%)

Clearly not.

  1. Yes, in a VoIP context signalling an Opus packet is silence via the flag will cause the comfort noise generator to produce noise, but it won't be white.
  2. Volume was reduced without transcoding via the opus_metadata FFmpeg BSF.
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