[C2] Bluetooth sound quality decreases while playing

REPRODUCIBILITY: 80% (often)
OSVERSION: 5.0.0.21
HARDWARE: Reeder S19 Max Pro S - s19mps - s19mps - 1.0.0.15 - aarch64
UI LANGUAGE: Deutsch (user: de_DE, os: de_DE.utf8)
REGRESSION: not specified

DESCRIPTION:

When playing Music over Bluetooth-Output you can hear that the sound-quality (Bitrate) seems to decrease often while playing. It sounds like you lower the Output-Samplingrate and can be detected in mid to high Frequencys that sound a little bit distorted.

While my old Sony Xperia X Compact with official SFOS suffers the same bug, the Community-Port of XZ2 Compact doesn’t had this bug.

This bug is indepentend from the connected Bluetooth-Audio. I can reproduce it with my Sony WF-C500 In-Ear-Speakers and with LG Media-NAV Evolution Car-Audio. Pressing Pause and Play fixed it for a small Time-Window. It seems to be triggered more often when the CPU or GPU is under heavy load.

The Distance from the Bluetooth-Audio-Device to the C2 doesn’t change, so i can sort out this as an issue.

PRECONDITIONS:

STEPS TO REPRODUCE:

  1. Connect to Bluetooth-Audio Unit like Headphone
  2. Start Jolla Mediaplayer
  3. Play a Song
  4. Wait until Sound-Quality decreases
  5. Pressing Pause and Play fixed it for a small Time-Window

EXPECTED RESULTS:

Bitrate and Sound-Quality stays the same

ACTUAL RESULTS:

Sound-Quality decreases.

MODIFICATIONS:

  • Patchmanager: no
  • OpenRepos: yes
  • Chum: yes
  • Other: none specified

ADDITIONAL INFORMATION:

Device Owner User: defaultuser
Home Encryption: enabled

the initial version of this bug report was created using Bugger 0.9.10+git7
1 Like

I noticed something similar during calls also.

It seems to be dramatically better with the 5.0.0.29 update. Jolla removed unnecessary logging in the background, which could be the cause of higher I/O and CPU usage, and thus improved/made it more solid while streaming. However, this is just a personal guess and observation.

I will observe it further and will report back then.