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Resampling of lossless audio files depending on samplerate
I would like to be able to resample lossless audio files (FLAC, WAV etc.) to a different samplerate. The reason for this is that not all DACs support all samplerates. Depending on the DAC I want to be able to downsample hirez files to a samplerate that the DAC can process. The resampling should be in integer ratio, as non integer ratio resampling uses more processor power at a given level of accuracy. An example profile.xml entry to do this would look something like this:
<Transcoding>
<Audio targetContainer="lpcm" aSamplerate="44100">
<Matches container="flac" aSamplerate="88200"/>
<Matches container="wavpack" aSamplerate="88200"/>
<Matches container="flac" aSamplerate="176400"/>
<Matches container="wavpack" aSamplerate="176400"/>
</Audio>
<Audio targetContainer="lpcm" aSamplerate="48000">
<Matches container="flac" aSamplerate="96000"/>
<Matches container="wavpack" aSamplerate="96000"/>
<Matches container="flac" aSamplerate="192000"/>
<Matches container="wavpack" aSamplerate="192000"/>
</Audio>
</Transcoding>
To maximise the quality of the resampling, ffmpeg should make use of sox for the resampling if possible. https://trac.ffmpeg.org/wiki/FFmpeg%20and%20the%20SoX%20Resampler
Thanks a lot
Comments (8)
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Account Deleted -
Account Deleted - edited description
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Account Deleted - edited description
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Account Deleted - edited description
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Account Deleted - edited description
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repo owner Similar issue to this: http://forum.serviio.org/viewtopic.php?f=7&t=18268&p=98182#p98182
Thinking it could be better to have these resampling rules hardcoded to keep the profiles clean (as DLNA only supports 44.1 and 48 for LPCM)
Something like:
if(targetContainer == LPCM) { if(file.samplerate in (44.1 / 88.2 / 176.4 / 352.8kHz )) { targetSamplerate = 44.1KHz } else if (file.samplerate in (48 / 96 / 192 / 384kHz)) { targetSamplerate = 48KHz } }
How does that sound?
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Account Deleted Sounds brilliant. See my post on Serviio Forum [http://forum.serviio.org/viewtopic.php?f=7&t=18268&p=98182#p98182] (User jacobacci)
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Account Deleted +1.
I noticed on the Sony BDP-S370 that FLAC files with a sample rate > 48,000hz don't show up unless a rule is added to match the FLAC container and transcode all such files to LPCM with a supported sample rate (e.g. 48,000hz). I've only tried 44,100hz, 48,000hz, 96,000hz, 176,400hz sample rate files so far.
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