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Add intermediate quality options: 32-40 kbit/s with ≥20 kHz sample rate for Opus

Open
  • Is something wrong?
#197 0 comments 2 reactions 0 assignees View on GitHub

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
35/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
android, kotlin
Domain
audio-video-rtc, mobile

Research direction

Start by finding where the app defines recording quality presets and configures the Opus encoder. Check how the existing 64 kbit/s at 48 kHz option is represented and how preset choices reach the encoder. Done means adding 32 kbit/s at 24 kHz and 40 kbit/s at 24 kHz options while retaining the existing 64 kbit/s at 48 kHz option.

Written by the indexing model from the issue text.

Description

feature request
Checklist
  • I made sure that there are no existing issues - open or closed - to which I could contribute my information.
  • I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
  • I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
  • I have taken the time to fill in all the required details. I understand that the request will be dismissed otherwise.
  • This issue contains only one feature request.
  • I have read and understood the contribution guidelines.
Feature description

I would like to be able to set sample rate to >=20 kHz for any bitrate in range 32-40 kbit/sec.

Why do you want this feature?

I would like to make voice recordings transparent, without noticeable quality degradation.

At the moment I am forced to select 64 kbit/sec.

I am quite sure that opus codec can encode voice transparently at 32 kbit/sec given possibility to do so: if #196 is fixed and sampling rate set to >=20 kHz. Even without fixing #196 at 40 kbit/sec CBR opus should be quite good.
See https://wiki.hydrogenaudio.org/index.php?title=Opus for instance for confirmation.

Enabling higher sampling rate for 32 kbit/sec will allow me to reduce size of my audio recordings 2x times.

Additional information

No response

Proposed implementation

Add quality presets:

  • 32 kbit/s @ 24 kHz (Voice High Quality)
  • 40 kbit/s @ 24 kHz (Voice Premium)
  • Keep existing 64 kbit/s @ 48 kHz option
Dominant language
Kotlin
Stars
1k
Forks
98
Avg merge
2d 2h
Merged PRs (30d)
14

Getting set up

First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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