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Topic: Error by converting from 24bit/192khz FLAC file (Read 4801 times) previous topic - next topic
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Error by converting from 24bit/192khz FLAC file

I own a SONOS multi-room system. My media library ist send to SONOS by a Subsonic media server.
Unfortunately SONOS can't play 24bit/192khz audio files. So my 24bit/192khz FLAC files can't be played too.

The solution can be the subsonic build in flac-transcoder.

To not loose a lot of quality i plan to convert all the 24bit/192khz audio files on the media server by the flac-transcoder on the fly by the following 2 commands:

1. decoding the 24bit/192khz flac files into raw format:

>> flac -d --force-raw-format --endian=little --sign=signed file.flac -o file.raw

2. encoding the raw files into 16bit/48000khz flac files:

>> flac --fast --force-raw-format --endian=little --sign=signed --channels=2 --bps=16 --sample-rate=48000 file.raw -f -o file.converted.flac

Unfortunatelly i get only a noise flac output at 16bit/48khz. On the other hand, when ich do this conversation not with 24bit/192khz but with 16bit/44,1khz FLAC files i succeed the get 16bit/48khz.

Maybe this is a FLAC bug? Or have i a brain error...? 

Can you please help me out? Thank you in advance...

Error by converting from 24bit/192khz FLAC file

Reply #1 –
Quote from: Nordstern on
2. encoding the raw files into 16bit/48000khz flac files:

>> flac --fast --force-raw-format --endian=little --sign=signed --channels=2 --bps=16 --sample-rate=48000 file.raw -f -o file.converted.flac

Unfortunatelly i get only a noise flac output at 16bit/48khz.

You do not convert here. You ask flac to treat data in 24bit/192kHz format AS IF they were in 16bit/44.1kHz format. Of course it doesn't work.


Quote from: Nordstern on
On the other hand, when ich do this conversation not with 24bit/192khz but with 16bit/44,1khz FLAC files i succeed the get 16bit/48khz.

But such 'conversion' increases pitch and reduces duration of a track.

You need to resample the audio to 44.1 kHz and reduce its bit depth to 16 bits.

Error by converting from 24bit/192khz FLAC file

Reply #2 –
@Nordstern
flac alone does not help here because it has no build in resampler, SoX should be able to do what you want.

Edit: I have to admit i don't know much about the subsonic server you use so SoX may be no option. On my Logitech media server SoX transcoding can be configured for the streamers.
Is troll-adiposity coming from feederism?
With 24bit music you can listen to silence much louder!

Error by converting from 24bit/192khz FLAC file

Reply #3 –
Quote from: lvqcl on
You do not convert here. You ask flac to treat data in 24bit/192kHz format AS IF they were in 16bit/44.1kHz format. Of course it doesn't work.


That's they Point i did not see...    Thank you! I have to think about another way to do this, as no other lossless converter is available in the system (QNAP).

Error by converting from 24bit/192khz FLAC file

Reply #4 –
QNAP supports DLNA
If SONOS supports DLNA too, it will probably  handle the conversion on the fly
TheWellTemperedComputer.com

Error by converting from 24bit/192khz FLAC file

Reply #5 –
Quote from: Nordstern on
That's they Point i did not see...    Thank you! I have to think about another way to do this, as no other lossless converter is available in the system (QNAP).


Is your issue with the bit-depth or the sample-rate?
lossyWAV -q X -a 4 -s h -A --feedback 2 --limit 15848 --scale 0.5 | FLAC -5 -e -p -b 512 -P=4096 -S- (having set foobar to output 24-bit PCM; scaling by 0.5 gives the ANS headroom to work)