12 Apr
2013
12 Apr
'13
4:33 p.m.
Is there a way to detect pre-emphasis in a music file from the command line?
I recently came across a CD with pre-emphasis and, given that I have a load
of files on HD - some of which are from a company that is said to have used
pre-emphasis - I would like to check to see if it is used in any of these
files.
- Richard.
--
Richard Kimber
Political Science Resources
http://www.PoliticsResources.net/
12 Apr
12 Apr
9:41 p.m.
On Fri, Apr 12, 2013 at 03:33:26PM +0100, R Kimber wrote:
I recently came across a CD with pre-emphasis and,
given that I have a load
of files on HD - some of which are from a company that is said to have used
pre-emphasis - I would like to check to see if it is used in any of these
files.
If the copy was made from the analog outputs of a CD player then the
player will have applied de-emphasis so the file will be OK. If the
copy was made digitally it depends on the sofware used.
A pre-emphasised CD played without de-emphasis will sound unusually
bright. The pre-emphasis is roughly the same as a typical 'treble'
tone control set to +10 dB, so it should be pretty obvious.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
13 Apr
13 Apr
5:09 p.m.
On Fri, 12 Apr 2013 19:41:29 +0000
Fons Adriaensen wrote:
If the copy was made from the analog outputs of a CD
player then the
player will have applied de-emphasis so the file will be OK. If the
copy was made digitally it depends on the sofware used.
Not copied from analogue outputs.
A pre-emphasised CD played without de-emphasis will
sound unusually
bright. The pre-emphasis is roughly the same as a typical 'treble'
tone control set to +10 dB, so it should be pretty obvious.
Sure, but I want to check hundreds of files on a hard disk. Are you saying
that there is no tool that I can incorporate in a script to do this from the
command line? That's what I'm asking.
--
Richard Kimber
Political Science Resources
http://www.PoliticsResources.net/
6:19 p.m.
On Sat, Apr 13, 2013 at 04:09:01PM +0100, R Kimber wrote:
Such a tool would have to 'know' how something is supposed to
sound, i.e. what the expected average spectrum should be, and
then decide if a file is too bright or not. Apart from that,
once the CD is converted to a file there is no other way. So
you'll have to listen.
Anyway rather few CDs will have pre-emphasis, it is mainly
a thing from the early days when many players were limited
to 14 bits.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
A
pre-emphasised CD played without de-emphasis will sound unusually
bright. The pre-emphasis is roughly the same as a typical 'treble'
tone control set to +10 dB, so it should be pretty obvious.
Sure, but I want to check hundreds of files on a hard disk. Are you saying
that there is no tool that I can incorporate in a script to do this from the
command line? That's what I'm asking.
11:12 p.m.
On Sat, 13 Apr 2013 16:19:45 +0000
Fons Adriaensen wrote:
Such a tool would have to 'know' how something
is supposed to
sound, i.e. what the expected average spectrum should be, and
then decide if a file is too bright or not. Apart from that,
once the CD is converted to a file there is no other way. So
you'll have to listen.
Ah OK. I thought there was a flag in the meta data.
-Richard.
--
Richard Kimber
Political Science Resources
http://www.PoliticsResources.net/
11:29 p.m.
On Sat, Apr 13, 2013 at 10:12:03PM +0100, R Kimber wrote:
On Sat, 13 Apr 2013 16:19:45 +0000
Fons Adriaensen wrote:
On the CD that is so, there is a pre-emphasis flag in the Q
subcode and if you're lucky also in the TOC. Maybe some CD
ripping tools copy this data into the audio file, but I guess
most don't.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
Such a tool would have to 'know' how
something is supposed to
sound, i.e. what the expected average spectrum should be, and
then decide if a file is too bright or not. Apart from that,
once the CD is converted to a file there is no other way. So
you'll have to listen.
Ah OK. I thought there was a flag in the meta data.
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5 comments
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participants (2)
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Fons Adriaensen -
R Kimber