codec-string

decode the codec= string in a media mime type

supports

• HEVC (hvc1, hev1)
• AVC (avc1)
• AAC (mp4a)
• AV1 (av01)
• E-AC3 (ec-3) - no processing required
• VP9 - see https://www.webmproject.org/vp9/mp4/
• EVC - refer annex E.9 of ISO/IEC 14496-15:2019 Amd.2
• VVC - refer annex E.6 of ISO/IEC 14496-15:2019 Amd.2
• MPEG-H
• AVS3