[Flac] FLAC: getting compression level using metaflac

Brian Willoughby brianw at sounds.wa.com
Thu Jul 5 10:02:59 PDT 2007

The compression level is really only just a convenient shortcut for  
humans to use when creating a flac file.  The real values used during  
compression include Max LPC order, blocksize, Rice partition order  
(min,)max, exhaustive model search flag, and mid-side or Adaptive mid- 
side coding flags.  As you can see, there are a lot of parameters and  
options, to the compression level just represents common  
combinations.  You can't store the level in the metadata because you  
can create a tuned flac file without any compression level at all.   
Another thing to consider is that compression level 8 is not always  
the best for every file.

Brian Willoughby
Sound Consulting

On Jul 5, 2007, at 02:41, Harry Sack wrote:
> Why isn't the compression level added in a metadata block by the  
> flac encoder itself (just like the encoder version)? In this way  
> all programs that read the file can see what compression level was  
> used.
> thx
> 2007/7/4, Scot Thompson <scot.thompson at cox.net>:
> This has been asked many times.  The answer is no.  I suggest  
> saving the compression level into a tag for future reference, but  
> that won't help you with files you get from unknown locations.
> From: flac-bounces at xiph.org [mailto:flac-bounces at xiph.org] On  
> Behalf Of Harry Sack
> Sent: Wednesday, July 04, 2007 7:14 AM
> To: flac at xiph.org
> Subject: [Flac] FLAC: getting compression level using metaflac
> Hi FLAC list!
> I have a question (maybe a strange one) about getting the  
> compression level (0-8) using metaflac.
> So I want to know for a given FLAC file what compression level was  
> used to compress that file.
> I tried using the --list option but this doesn't give any  
> information about this.
> Is there a way to get the compression level of a given FLAC file  
> using metaflac or another tool?
> thx

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