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Improve ffmpeg command to transcode flac (#99)

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* Improve ffmpeg command to transcode flac

The command previously suggested forced the output sample rate to 48 kHz, even if the input was lower, at 44.1 kHz. 
This new command lets `ffmpeg` select the appropriate output sample rate to minimize conversion. 
Documentation: https://www.ffmpeg.org/ffmpeg-filters.html#aformat-1

* Update transcoding command

- Support more sample rates and bit depths.
- Add note about S1
This commit is contained in:
Laurent le Beau-Martin
2022-03-09 23:06:56 -05:00
committed by GitHub
parent 9b3df4ce1a
commit 192f65a56b
1 changed files with 8 additions and 2 deletions
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@@ -209,10 +209,16 @@ In this case you could set;
BNB_SUBSONIC_CUSTOM_CLIENTS="audio/flac"
```
This would result in 2 players in Navidrome, one called 'bonob', the other called 'bonob+audio/flac'. You could then configure a custom flac transcoder in Navidrome that re-samples the flacs to a sonos supported format, ie [Using something like this](https://stackoverflow.com/questions/41420391/ffmpeg-flac-24-bit-96khz-to-16-bit-48khz);
This would result in 2 players in Navidrome, one called 'bonob', the other called 'bonob+audio/flac'. You could then configure a custom flac transcoder in Navidrome that re-samples the flacs to a sonos supported format, ie [Using something like this](https://stackoverflow.com/questions/41420391/ffmpeg-flac-24-bit-96khz-to-16-bit-48khz) or [this](https://stackoverflow.com/questions/52119489/ffmpeg-limit-audio-sample-rate):
```bash
ffmpeg -i %s -af aresample=resampler=soxr:out_sample_fmt=s16:out_sample_rate=48000 -f flac -
ffmpeg -i %s -af aformat=sample_fmts=s16|s32:sample_rates=8000|11025|16000|22050|24000|32000|44100|48000 -f flac -
```
**Note for Sonos S1:** [24-bit depth is only supported by Sonos S2](https://support.sonos.com/s/article/79?language=en_US), so if your system is still on Sonos S1, transcoding should convert all FLACs to 16-bit:
```bash
ffmpeg -i %s -af aformat=sample_fmts=s16:sample_rates=8000|11025|16000|22050|24000|32000|44100|48000 -f flac -
```
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