Local Navigation
- S&G Home
- S&G About
- Accessibility
- Design & Editorial
- Infrastructure
- Policy
- Red Button
-
Technical
- Application Development
- Audio-Video Standard
- Barlesque Implementation
- Browser Support
- C++ Coding
-
Clickthrough (Go-) Tracking
- Cookies
- CSS
- Database Design & Development
- Downloads
- File Extensions
- File Serving
-
.htaccess
- JavaScript
- Maps
- Multimedia Plug-ins
- Perl Coding
- RSS
- Semantic Mark-up
-
Sitemaps Guide
- XHTML Integrity
- XML
- XSSI (eXtended Server Side Includes)
- Glossary
- Contacts
Audio Standards Table v1.55
1. Audio standards
| AUDIO | band | Codec | Max bit/ sample rates | Min bit/ sample rates | Comments |
|---|---|---|---|---|---|
| Realplayer/Helix | nb | G2-v10 | 44 kbps/ 32 kHz | 8.5 kbps/ 11.025 kHz (speech only) | You MUST include at least a 32kbps and 20kbps substream |
| Windows Media/Audio (WMA) | nb | WMA v9 | 48 kbps/ 32 kHz | 8.5 kbps/ 11.025 kHZ (speech only) | You MUST include at least a 32kbps and 20kbps substream (check with SBS) |
| Realplayer/Helix (stereo) | bb | v9/10 | 96 kbps/ 44.1 kHz | na | Single Rate |
| Realplayer/Helix (mono) | bb | v9/10 | 64 kbps/ 44.1 kHz | na | Single Rate |
| Windows Media/Audio (WMA) (stereo) | bb | WMA v9 pro | 96 kbps/ 44.1 kHz | na | Single Rate |
| Windows Media/Audio (WMA) (mono) | bb | WMA v9 pro | 64 kbps/ 44.1 kHz | na | Single Rate |
2. Video standards
| VIDEO | band/ aspect ratio | Codec | Max bit rate | Frame size | Frame rate | Comments |
|---|---|---|---|---|---|---|
| Realplayer/ Helix | nb ws (16:9) | v9/10 | 80 kbps | 256 x 144 | 15 fps | Any narrowband stream over 34kbps MUST include a 34kbps substream (multiple bit rate) |
| Windows Media (WMV) | nb ws (16:9) | WMV V9 Pro | 80 kbps | 256 x 144 | 15 fps | Any narrowband stream over 34kbps MUST include a 34kbps substream (multiple bit rate – check with SBS) |
| Realplayer/ Helix | bb ws (16:9) | v9/10 | 225 kbps (single rate) | 400 x 224 | 25 fps | If you are using the NM Broadband console then you SHOULD use 384x216 |
| Windows Media (WMV) | bb ws (16:9) | WMV V9 Pro | 225 kbps (single rate) | 400 x 224 | 25 fps | If you are using the NM Broadband console then you SHOULD use 384x216 |
| 4:3 settings are deprecated – 16:9 should be used where possible | ||||||
| Realplayer/ Helix | nb (4:3) | v9/10 | 80 kbps | 192 x 144 | 15 fps | Any narrowband stream over 34kbps MUST include a 34kbps substream (multiple bit rate) |
| Windows Media (WMV) | nb (4:3) | v9 pro | 80 kbps | 192 x 144 | 15 fps | Any narrowband stream over 34kbps MUST include a 34kbps substream (multiple bit rate – check with SBS) |
| Realplayer/ Helix | bb (4:3) | v9/10 | 225 kbps (single rate) | 320 x 240 | 25 fps | |
| Windows Media (WMV) | bb (4:3) | v9 pro | 225 kbps (single rate) | 320 x 240 | 25 fps | |
3. Download – audio
| MP3 (stereo music) | dn | dn pcm | 128 kbps/ 44.1 kHz | CBR |
|---|---|---|---|---|
| Mp3 (mono speech) | dn | dn pcm | 64 kbps/ 44.1 kHz | CBR |
| AAC (stereo music) | dn | dn pcm | 128 kbps/ 44.1 kHz | CBR – AAC files MUST only be used with a counterpart MP3 file |
| AAC (mono speech) | dn | dn pcm | 64 kbps/ 44.1 kHz | CBR – AAC files MUST only be used with a counterpart MP3 file |
4. Download – Video (Flash)
See also section 3.6 of the Multimedia Plug-in Content Standards
| Flash | Download only | v7 or later | 225 kbps |
5. Key
- dn pcm
- download podcast maker
- ws
- wide screen
- fps
- frames per second
- kbps
- kilo bit per second
- na
- not applicable
- nb
- narrowband
- bb
- broadband
- CBR
- constant bitrate
- SBS
- Siemens Business Services (in this case Internet Operations)
bbc.co.uk navigation
BBC links
BBC © 2013 The BBC is not responsible for the content of external sites. Read more.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.