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  1. #1
    Senior Member
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    Transcode and upsample at once?

    I want to transcode FLAC to WAV and upsample the output to 96K. First I changed FLAC output to Disabled under Advanced->File Types, so that all FLAC files will be forced to transcode to WAV. Then I added a custom-convert.conf file. The content of the file is:

    flc pcm * *
    # FT:{START=--skip=%t}U:{END=--until=%v}D:{RESAMPLE=-r %d}
    [flac] -dcs $START$ $END$ -- $FILE$ | [sox] -q -t wav - -t wav - rate -b 85 -Lv 96k

    The conversion appears to work, but my Transporter is still thinking the output is 44.1K instead of 96K, so the playback is run with the wrong clock. How do I tell TP that the output is 96K?

  2. #2
    Senior Member pippin's Avatar
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    Are you trying to use up as much bandwidth as possible or what is this good for?
    Upsampling 44.1 material to 96k will at best gain you nothing but more likely just degrade your sound quality.
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  3. #3
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    I want to test the sonic quality of SBT+EDO. So far, server side decode of FLAC instead of client side decode on SBT has provent to be better sounding for redbook material.

    I want to see if taking it to 96K would make it sound even better.

  4. #4
    Senior Member
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    Aug 2011
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    Quote Originally Posted by Kuro View Post
    I want to test the sonic quality of SBT+EDO. So far, server side decode of FLAC instead of client side decode on SBT has provent to be better sounding for redbook material.

    I want to see if taking it to 96K would make it sound even better.
    Do you mean decoding FLAC and WAV on the LMS server by setting Server Setting -> Advanced -> File types -> setting decoder to disabled except for PCM?.

    I heard setting decoding on server is really not beneficial.

  5. #5
    Senior Member
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    Quote Originally Posted by lake_eleven View Post
    Do you mean decoding FLAC and WAV on the LMS server by setting Server Setting -> Advanced -> File types -> setting decoder to disabled except for PCM?.

    I heard setting decoding on server is really not beneficial.
    Yes, one can use File Types to disable native FLAC streaming and this forces the server to do the decoding and stream in WAV.

    It does make a difference in sound for Touch. You do need high resolution system to hear it. I use SBT+EDO and outputs to Anedio D2 DAC via USB. I used Stax electrostatic headphones and I can clearly hear the improvements (ie: vocal is more velvety/emotional, transient and bass dynamics are faster).

  6. #6
    Junior Member
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    May 2012
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    I suppose if you don't hear it this merely proves your system is not high-end enough?

  7. #7
    Senior Member Soulkeeper's Avatar
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    Quote Originally Posted by Willakan View Post
    I suppose if you don't hear it this merely proves your system is not high-end enough?
    Of course. Kuro says xe can hear it, thus it's objective fact (unlike blind testing which is only part of a conspiracy to make everybody prefer cheap portable cassette players). Right?

  8. #8
    Senior Member Mnyb's Avatar
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    If hearing obvius differences, check if replay gain/smart gain is enabled ? disable it and try again .

    There could a valid reason, some vierdo audiophile DAC's may themselves work better with certain sample rates eg 24/96, I would consider such product broken..
    What comes to mind is some NOS DAC's without filter urgh.
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  9. #9
    Senior Member
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    Can we get back to the topic on how to upsample FLAC to 24/96 and outputs it in WAV?

    Whether someone can hear the sonic improvement is a very subjective thing. It depends on the gear, the plackback materials and your hearing.

  10. #10
    Senior Member
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    I doubt that this is doable within the transcoding framework. It just wasn't designed with that sort of flexibility in mind.

    One thing I do know is that you don't want the output type in SoX to be WAV if PCM is the target. You need to use the output type 'raw' in SoX, as the Squeezebox will be expecting a headerless stream. With type WAV you're probably hearing a click at the beginning of each track, which is the WAV header being played.

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