Re: What audio format do you usually use for speech contents?
Reply #6 –
If we are strictly talking speech... Opus v1.3.1 @ 13kbps (or Opus v1.2 @ 14kbps) is what I consider THE minimum I would personally use (although if one likes to play it a bit safer you could bump up the bit rate a bit). I can notice the difference from a higher quality source file but it's not that significant of a hit (say going from a 128kbps MP3 and thereabouts to Opus @ 13kbps) and saves you a lot of storage space and it is speech at the end of the day and not music, so I don't mind sacrificing some speech quality to save storage space.
so while I have not played with it too much, I can't imaging needing more than around 32-48kbps tops for speech only on Opus, even for those who prefer to have a bit higher quality speech but are not too concerned with total or near transparency.