Knowledge Base

Opus Encoding

Last Updated: Jan 26, 2017 11:04AM GMT

Recording

Audio Notetaker now records in the standardised Opus audio encoding system (standardised by the Internet Engineering Task Force - IETF). It is particularly suitable for Audio Notetaker as it combines technology from both audio (perceptual) and speech (voice modelling) encoders, giving the best possible quality for speech whilst coping perfectly with general audio as well. It uses Variable Rate Coding, which means that if there's not much sound to encode, it doesn't waste space encoding it - perfect for Audio Notetaker which doesn't care if the encoding rate is fixed or not. So all in all, it gives the best file-size/quality tradeoff possible. This will make quite a difference when uploading your ran files to and from the Cloud, attaching them to emails etc

 

But that isn't the only reason we have adopted it as our internal audio format for version 3. Unlike all other audio compression standards, it has a royalty-free license scheme. This means there are no barriers to anyone and everyone adopting the standard in their web-browsers, operating systems etc. Indeed, it has only been standardised since September 2012, and already Mozilla supports it in Firefox, and Cisco and Google are supporting it in various products. Unlike the current inconsistent support for the various audio formats across browsers, operating systems & media players, we expect Opus to be fully supported on all of these within a year or two. This means the audio in your ran files will always be usable without further conversion - even if right now you may have to convert to wma/m4a on export, if your favourite media player doesn't yet support opus.

 

Importing Audio

By default ALL audio files are converted to Audio Notetaker's internal format, Opus, on import. You can disable this;  go to App Menu > System > Settings > Audio Files. 

 

Conversion

We also use Speech Quality Conversion  (Fast Conversion on Mac) as default which doubles the conversion speed, creating smaller files, and makes little difference to the quality of your recordings. You may find that the quality of recordings of more subtle sounds such as musical instruments is affected.You can set the convert to Music Quality Conversion which will take longer to convert but will produce better quality, larger files.

Contact Us

  • Phone UK: 0113 8150222
  • Phone US: +1.202.657.4332
  • Skype: sonocent

Search

Recent Discussions

Ajax-loader-small
http://assets1.desk.com/
false
audionotetaker
Loading
seconds ago
a minute ago
minutes ago
an hour ago
hours ago
a day ago
days ago
about
true
Invalid characters found
/customer/en/portal/articles/autocomplete
There was an error contacting Get Satisfaction
View All
0
discussions
replies
Questions
Ideas
Problems
Praise