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openwebrx/README-FORK.md
DevBench 5206e5b0ae DAB+ audio: WAV default for all sample rates (24/32/48 kHz), stereo input fix 
- Default: dablin -w so ffmpeg reads rate and channels from WAV header;
  all DAB+ services (24/32/48 kHz, mono/stereo) play at correct speed.
- Fallback: OPENWEBRX_DAB_USE_WAV=0 uses PCM path with
  OPENWEBRX_DAB_INPUT_RATE (24000|32000|48000).
- Fix: treat dablin output as stereo (-ac 2); mono caused consistently
  slow playback.
- Optional OPENWEBRX_DAB_CAPTURE_RAW=1 for raw PCM capture (PCM path).
- README-FORK.md: document env vars and behaviour.
2026-02-06 02:14:19 +00:00

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dom-robinson/openwebrx fork – DAB+ sample rate fix

This is a clone of dom-robinson/openwebrx with branch feature/dab-audio-fix containing improvements over upstream jketterl/openwebrx PR #419: Fix DAB+ audio sample rate issues using ffmpeg resampling.

What’s in this branch

  • owrx/dab/dablin.py – DAB+ audio fix with automatic handling of all sample rates (24/32/48 kHz) and mono/stereo:
    • Default (WAV path): dablin -w so ffmpeg reads sample rate and channel count from the WAV header; resample to 48 kHz stereo. All DAB+ services play at correct speed without configuration.
    • Fallback (PCM path): Set OPENWEBRX_DAB_USE_WAV=0 and optionally OPENWEBRX_DAB_INPUT_RATE=24000|32000|48000 if WAV causes issues. Optional OPENWEBRX_DAB_CAPTURE_RAW=1 tees raw PCM to /tmp/dablin_capture.raw for analysis.
    • Critical fix: Treat dablin output as stereo (-ac 2) when using PCM; using mono caused consistently slow playback.
  • docker/scripts/install-dependencies.sh – Add sox to static packages.
  • Dockerfile.hotfix – Optional image that builds dablin from source and applies the dablin.py patch.

Environment variables (optional)

Variable Default Description
OPENWEBRX_DAB_USE_WAV 1 Use dablin WAV output so rate/channels are automatic. Set 0 to use PCM path with fixed rate.
OPENWEBRX_DAB_INPUT_RATE 32000 Only when OPENWEBRX_DAB_USE_WAV=0: input rate 24000, 32000, or 48000.
OPENWEBRX_DAB_CAPTURE_RAW unset Set to 1 to tee raw PCM to /tmp/dablin_capture.raw (PCM path only, for analysis).

Push this branch to the fork

From this directory, with GitHub auth set up:

git push -u origin feature/dab-audio-fix

After pushing, the fork on GitHub will list the branch and you can open or update a PR to jketterl/openwebrx, or build images from it.