[LAU] Advice for validating quality

[Justin Smith]

On Sat, May 10, 2008 at 6:41 AM, Julien Claassen <julien at c-lab.de> wrote:
> Hello!
>   I can only reliably comment on one aspect: Clipping and volume:
> ecasound -i input.wav -o null -ev
>   Will give a long statistic and the last line of that says something like:
> (audiofx) Max gain without clipping, all: 1.69677.
>   that means with:
> ecasound -i input.wav -o output.wav -ea:169.677
>   you can amplify your file to full volume without having clipping.
>   You could alternatively use some normalising software like:
> ecanormalize input.wav
>   If it tells you the the file is already normalised, it means (in 99 of 100
> cases), that there is clipping.
>   Other interactive ways might be some graphical analysing software, take a
> look at linuxaudio.org or at Dave's page linux-sound.org, they should list
> enough software in this field.
>   For glitches I don't know, listen, perhaps some fft-based piece of software
> exists, which could find possible glitches, by finding "broken waves", with
> methods of mathematical analysis.
>   HTH.
>   Kindest regards
>          Julien
>
> --------
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>
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For software caused glitches: ardour has an option to stop recording
if jack has an xrun (an xrun being the most likely kind of software
glitch). I would turn this option on when recording, and if a track is
interrupted in the middle somewhere, re-record starting at that track.
For post-production mastering (which you need to get the most out of
your raw recorded material) there is jamin, but how to do
post-production mastering is a bit too big a topic for an email (as I
understand it, there are plenty of folks out there which will offer
you multiple-year courses in the subject for a considerable fee).