xiph / xiph/opus

Compatibility issues: 1.3.1 encoder (on Ubuntu 20.04) with 1.1.2 decoder (on Ubuntu 18.04)

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C
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Description

Hi all,

TL;DR: Encoding with 1.3.1 Opus encoder and decoding with 1.1.2 Opus decoder results in extremely bad / distorted audio.

When we encode the audio with 1.3.1 Opus encoder (on 20.04), and decode it with 1.1.2 Opus decoder (on 18.04) - we get very distorted sound.
When we manually cloned the Opus git repo, and built v1.1.2 on the 20.04 machine - the resulting sound quality was good.

  1. Do you know why we are experiencing the distorted / bad quality audio? Are 1.3.1<>1.1.2 incompatible (I didn't find any such note in the Opus documentation)
  2. Can I somehow change the 1.3.1 encoder configurations, so that it's compatible with a 1.1.2 decoder?
  3. Is there a way to install 1.3.1 on 18.04 OR 1.1.2 on 20.04, without manually cloning the git repo and building?

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

No source file, test, or entry point is named. Start by reproducing the distorted audio across the stated Opus and Ubuntu version pairs and compare the manually built v1.1.2 result; done means determining whether the versions are incompatible, whether an encoder configuration restores compatibility, or whether a supported installation path exists.

Written by the indexing model from the issue text.

Assessment

Tech stack
c, ubuntu
Domain
audio-video-rtc
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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