Index - O
| OggVorbisSpecmode1 | Sound.Wav |
| OggVorbisSpecmode1Plus | Sound.Wav |
| OggVorbisSpecmode2 | Sound.Wav |
| OggVorbisSpecmode2Plus | Sound.Wav |
| OggVorbisSpecmode3 | Sound.Wav |
| OggVorbisSpecmode3Plus | Sound.Wav |
| OKIADPCM | Sound.Wav |
| OlivettiADPCM | Sound.Wav |
| OlivettiCELP | Sound.Wav |
| OlivettiGSM | Sound.Wav |
| OlivettiOPR | Sound.Wav |
| OlivettiSBC | Sound.Wav |
| On2VP6On2Technologies | Sound.Wav |
| On2VP7On2Technologies | Sound.Wav |
| Onlive | Sound.Wav |
| originalDimensions | Sound.Wav |
| originalForm | Sound.Wav |
| originalMedium | Sound.Wav |
| originalProduct | Sound.Wav |