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Thread: Apple Lossless [Apple Open Source Encoder / Decoder]

  1. #1
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    Apple Lossless [Apple Open Source Encoder / Decoder]

    We have updated our codecs to use Apples released code.

    <now released (as part of R14.3)>
    Last edited by Spoon; 09-06-2012 at 07:08 AM.

  2. #2

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    Re: Apple Lossless [Apple Open Source Encoder / Decoder]

    Hi Spoon,

    Sorry dumb question, but is this beta?

    Thanks

  3. #3

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    Re: Apple Lossless [Apple Open Source Encoder / Decoder]

    refalac64 is still faster, what encoder is used for this?

    https://sites.google.com/site/qaacpage/news

  4. #4
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    Re: Apple Lossless [Apple Open Source Encoder / Decoder]

    Apples own Encoder is used.

    This is the beta.

  5. #5
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    Re: Apple Lossless [Apple Open Source Encoder / Decoder]

    Updated 1st December

    Works with multi channel (more than 2) now.

  6. #6

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    Re: Apple Lossless [Apple Open Source Encoder / Decoder]

    I have a problem when using the beta ALAC codec to encode 5.1 multi channel files. When I encode 5.1 files with high frequencies or sample size (96 kHz or 48 kHz / 24 bits), the resulting ALACs have negative chunk offsets in STCO box. I could upload samples ALAC files if it can help (but they are quite big).

  7. #7
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    Re: Apple Lossless [Apple Open Source Encoder / Decoder]

    What size is the file, > 2GB or > 4GB?

  8. #8

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    Re: Apple Lossless [Apple Open Source Encoder / Decoder]

    All files I used for my tests (including WAV source files) take less than 350 mb.

  9. #9
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    Re: Apple Lossless [Apple Open Source Encoder / Decoder]

    What exactly do you mean "negative chunk offsets"? STCO specification quite clearly says that the offsets are unsigned integers so they cannot be negative, am I right?

  10. #10

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    Re: Apple Lossless [Apple Open Source Encoder / Decoder]

    As you probably know values are negative if we convert them to signed integers, and they are very big integers if they are unsigned. Here is a screenshot :


  11. #11
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    Re: Apple Lossless [Apple Open Source Encoder / Decoder]

    Thanks for the report, I think I have a good idea what the issue is. An update correcting it will be posted shortly.

  12. #12
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    Re: Apple Lossless [Apple Open Source Encoder / Decoder]

    Update 5th January 2012

    Bug Fix to Apple Lossless Encoder where for certain audio types (5.1 24 bit) the wrong value could be written to STCO

    Download update as first message.

  13. #13

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    Re: Apple Lossless [Apple Open Source Encoder / Decoder]

    Thanks, I do not have STCO problem anymore.

  14. #14
    dBpoweramp Enthusiast Nubben's Avatar
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    Re: Apple Lossless [Apple Open Source Encoder / Decoder]

    Hi - does this beta codec add the meta data before the other data so to optmise for streaming? Will a dBpa ripped version differ in any way from an iTunes ripped file?

    Thanks!

    Nubben

  15. #15
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    Re: Apple Lossless [Apple Open Source Encoder / Decoder]

    Tags are written before the data.

    dBpoweramp will at least tell you if the track contains ripping errors...

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