App Cloud
- Overview and general topics
- Product Updates
- Glossary
- The App Cloud SDK
- Creating an app template
- Tutorials
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- Development tips and best practices
- Packaging a template
- Creating apps from a template
- Publishing an app
- Delivering ads
- Push Notifications
- Analytics
- Managing users and accounts
Player Debugger
Resources
Creating Audio-Only Renditions for Low-Bandwidth Delivery
If you are delivering video to low-bandwidth devices, such as mobile phones using mobile networks, consider creating a rendition for your videos that has no video track, only an audio track. Apple, for example, recommends that videos used in iOS applications should provide an audio-only rendition at 40 kbps audio bitrate.
Because customized transcode settings are available only to Video Cloud Pro and Enterprise publishers, this information is not relevant for Video Cloud Express publishers.
To create an audio-only rendition setting:
- Add a rendition to your transcode settings, as described in the Adding or Removing Renditions section of Setting Your Transcoding Settings.
- Check the Audio Only box in the transcode settings.
- Select H264 for the Codec and H264_BASELINE for the Codec Profile.
- Select M2TS for the Video Container.
- Set the Audio Bitrate to 40 kbps.
- Make sure Two Pass is not checked.
- The Video Bitrate, Width, and Height settings are not relevant for an audio-only rendition, but you still need to set them to at least the minimum values: Video Bitrate 96 kbps, Width 50 and Height 50.
- Click Save Changes.
Once you have set your transcode settings to include an audio-only renditions, then every time you upload a video, whether you use the Media module, FTP batch provisioning, or the Media API, the video will include an audio-only rendition along with the other multi-bitrate renditions that are created.
Your existing video content will not automatically have an audio-only rendition; to create audio-only renditions for your existing videos, you need to re-encode them. See Re-encoding Existing Videos.
Delivering audio-only renditions
When an audio-only rendition is played back on an Apple iOS device, the QuickTime player is displayed. In a Flash player, a black video display is shown.
Related Information
For related information, see:
