A news report / news reel archive can save some costs by encoding as SDR (or even lower) with ~80kbps mono MP3 audio or somesuch, since most of everything past the intro jingle is human voice
- Opus would have MP3 beat for speech at lower bitrates as per the HydrogenAudio KB, Opus is transparent for speech at 32kbit/s with stereo speech being transparent at 40kbit/s. Beyond that, a typical bitrate for Opus audio on YT is something like 150kbit/s and that codec is transparent for music at 160-192kbit/s. Point being if one works in spoken word and they want to save as much space and bandwidth as possible while still sounding reasonable, 40-48kbit/s Opus would be the ideal audio codec for that as it would give transparent speech at half the bitrate of the 80kbit/s MP3 that's quoted here.