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Author Topic: MP3 Bit depth = 64(?)  (Read 2800 times)

shAf

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MP3 Bit depth = 64(?)
« on: September 19, 2013, 06:59:26 am »
I have a number of mp3 music files that show in MC with a bit depth of '64', which cannot be, else the file size would be much larger.  Is this number measured somehow by MC, or is MC simply reading a metatag?
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cheerios from the Avalon Peninsula, Newfoundland

Matt

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Re: MP3 Bit depth = 64(?)
« Reply #1 on: September 19, 2013, 08:46:15 am »
Update Library From Tags will put '16' in the 'Bitdepth' field for MP3 (as will doing a fresh import).

However, keep in mind:
http://wiki.jriver.com/index.php/Audio_Bitdepth#Bitdepth_of_Lossy_Formats
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JohanJooste

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Re: MP3 Bit depth = 64(?)
« Reply #2 on: November 18, 2013, 12:44:10 am »
Tx for the Interesting link Matt, quite usefull. I do have a question though. I've ripped a 24Bit CD (as printed on the Disc and album cover)
by Artist Ken Hensley using the Uncompressed WAV encoder, but when I checked in the MC Library its listed the Bitdepth as 16 and not 24. ?

Please could you advise and shed some light on this.

Thank you
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shAf

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Re: MP3 Bit depth = 64(?)
« Reply #3 on: November 18, 2013, 04:45:18 am »
Quote from: JohanJooste on November 18, 2013, 12:44:10 am
... I've ripped a 24Bit CD ... using the Uncompressed WAV encoder, but when I checked in the MC Library its listed the Bitdepth as 16 and not 24. ?
...

I believe the WAV format is 16bit by definition(?)  Besides, an equivalent WAV files would be unnecessarily large without compression.  You really want to use the lossless compression available from FLAC or ALAC ...
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cheerios from the Avalon Peninsula, Newfoundland

JohanJooste

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Re: MP3 Bit depth = 64(?)
« Reply #4 on: November 18, 2013, 06:44:44 am »
Tx shAf, thing is far as I know iPod Classic 160GB does not play FLAC files, not sure of the ALAC files though. Another issue is the size of the library
currently ±30k songs all imported and tagged in WAV format. Will research this further. regards
 
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Awesome Donkey

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Re: MP3 Bit depth = 64(?)
« Reply #5 on: November 18, 2013, 09:03:21 am »
Quote from: JohanJooste on November 18, 2013, 06:44:44 am
thing is far as I know iPod Classic 160GB does not play FLAC files, not sure of the ALAC files though.

Yes it can play Apple Lossless.
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shAf

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Re: MP3 Bit depth = 64(?)
« Reply #6 on: November 18, 2013, 09:47:28 am »
Quote from: Awesome Donkey on November 18, 2013, 09:03:21 am
Yes it can play Apple Lossless.
... but it will not play 24bit ALAC (... leastwise the standard player will not, but JRemote will play them without transcoding, FLAC too, but that would need JRemote connecting to the media server))
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cheerios from the Avalon Peninsula, Newfoundland

Vincent Kars

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Re: MP3 Bit depth = 64(?)
« Reply #7 on: November 18, 2013, 01:14:59 pm »
Quote from: JohanJooste on November 18, 2013, 12:44:10 am
I've ripped a 24Bit CD (as printed on the Disc and album cover)

Wouldn’t be surprised if you are (one of the many) victims of some marketing blurb.
It probably says 24 bits recording and this might very well be true as almost all recordings are made in 24 bits.

However, if it is an audio CD, the bit depth is 16 bit. If not, it won’t play on a CD player as 16 bit / 44 kHz is the audio CD standard.
If you have a CD player, play the disk. If it does play, it is 16 bits.
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Vincent Kars

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Re: MP3 Bit depth = 64(?)
« Reply #8 on: November 18, 2013, 01:17:37 pm »
Quote from: shAf on November 18, 2013, 04:45:18 am
I believe the WAV format is 16bit by definition(?)

No, FLAC supports
FLAC supports linear PCM audio:
• 4 – 32 bits fixed point word
• 1 Hz to 655,350 Hz sample rate in 1 Hz increments
• 1 – 8 channels
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6233638

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Re: MP3 Bit depth = 64(?)
« Reply #9 on: November 18, 2013, 04:54:27 pm »
Quote from: JohanJooste on November 18, 2013, 12:44:10 am
I do have a question though. I've ripped a 24Bit CD (as printed on the Disc and album cover)
by Artist Ken Hensley using the Uncompressed WAV encoder, but when I checked in the MC Library its listed the Bitdepth as 16 and not 24. ?
A CD cannot be 24-bit. The "24-bit" marketing means that the CD was mastered in 24-bit, and noise shaping was probably used when converting it to 16-bit for the CD format. (to get you more than 96dB dynamic range)
This will get you better quality than a completely 16-bit workflow, but it's really just marketing.
HDCD's will also give you 16-bit audio when you rip them, but it is possible to extract the full 20-bit signal from them using third-party tools. (I use dBpoweramp) They will be stored as "24-bit" files containing 20-bits of data though.
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Listener

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Re: MP3 Bit depth = 64(?)
« Reply #10 on: November 18, 2013, 05:13:06 pm »
Quote from: JohanJooste on November 18, 2013, 12:44:10 am
Tx for the Interesting link Matt, quite usefull. I do have a question though. I've ripped a 24Bit CD (as printed on the Disc and album cover)
by Artist Ken Hensley using the Uncompressed WAV encoder, but when I checked in the MC Library its listed the Bitdepth as 16 and not 24. ?

Please could you advise and shed some light on this.

Thank you

All CDs have 16 bit samples.  The "24bit" printed on the album cover refers to the sample size used in the recording or editing process.

WAV versus Flac has nothing to do with this issue.

Bill
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JohanJooste

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Re: MP3 Bit depth = 64(?)
« Reply #11 on: November 20, 2013, 01:58:07 am »
Tx for all the feedback and please excuse my ignorance. If the 24bit sample size was used in the recording or editing process
shouldnt it be listed as 24bit in MC instead of 16Bit? is it fair to assume then that SACD recordings will also be listed as 16 bit ?
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6233638

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Re: MP3 Bit depth = 64(?)
« Reply #12 on: November 20, 2013, 02:38:37 am »
A CD can only store 16-bit, 44.1kHz data. Being "mastered in 24-bit" does not change the fact that the disc can only store 16-bit data.
 
An HDCD can store 20-bit, 44.1kHz data - but it will be ripped as 16-bit by default.
You then need to process the file to extract the extra 4 bits. (though it will be stored in a 24-bit container) This is to maintain compatibility with regular CD players.
 
SACDs are often hybrid discs with a 16-bit, 44.1kHz CD layer, and a 1-bit, 2.8224MHz SACD layer. (DSD)
Computers can only read the CD layer - the only way to rip the SACD layer is to use a hacked PlayStation 3.
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