[Flac] Re: Converting to 1.1.4, help please!

[Josh Coalson]

flac -t (test mode) does everything flac -d (decode mode) does except
write the wav file, so it is faster than decoding a file to WAV but
still requires the whole FLAC file to be read.  if the file is still in
disk cache it will be pretty fast.

Josh


--- Brian Willoughby <brianw at sounds.wa.com> wrote:

> "reflac" seems like a decent script for being absolutely certain  
> about the conversion, but I can't help but think that it would run 5 
> 
> times faster without the "flac -t" and also using a single flac re- 
> encode without the intermediate WAV file.  I haven't done this  
> before, so I have no idea whether the metadata blocks would be  
> preserved more easily without the intermediate file.
> 
> Seems like Tim might want to rewrite "reflac" to do less, since  
> that's a really old computer.  Cutting out the intermediate WAV would
>  
> certainly reduce the disk access, which should speed things up a  
> lot.  And Josh hints that "flac -t" might be less needed now that  
> 1.1.4 is out.  I think "flac -t" is slow, but if it isn't then it  
> wouldn't hurt to have it in there, of course.
> 
> Brian W.
> 
> 
> On Apr 11, 2007, at 19:18, Jud White wrote:
> 
> You're right it decodes to WAV then re-encodes.. it uses flac option 
> 
> "-w" (warnings as error) and checks for error return codes.. if an  
> error occurs it restores the original file and reports the problem  
> when it fnishes or you ^C the program.. After re-encoding it deletes 
> 
> the wav, reads the original FLAC's metadata blocks (minus streaminfo 
> 
> and seektable) and writes them to the new FLAC file.. then it double 
> 
> checks the sample count in both flacs match (just in case), runs  
> "flac -t" on the new file to ensure the header and stream are in good
>  
> shape (in case of any probs in writing the metadata blocks), then it 
> 
> deletes the backup (if you have that option turned on).
> 
> I ran it on 50GB of FLAC (1700 files) on a Core 2 Duo 2.4GHz, 2GB of 
> 
> RAM and it took a long time.. not sure exactly because I interrupted 
> 
> it a lot but maybe around 10 hours.
> 
> The -r recursive means process subdirectories.. for example I have g:
> 
> \flac, g:\flac\a, g:\flac\b, etc .. so from g:\flac I just run it  
> with -r and it processors all the subdirs.
> 
> Tim wrote:
> > Hey Jud, Thanks!
> > I copied two of my FLAC folders (CDs) into a temp dir just to test 
> 
> > it out
> > and see if I could get it to run.
> > I put the four unzipped files into the dir folder and opened a cmd 
> 
> > window
> > using the same options you suggested:
> > "reflac -r -8 -nw -nb"
> >
> > It looks as though it first converts the files to WAV then re- 
> > encode them
> > into FLAC 1.1.4 then deletes the WAV, correct?
> >
> > I was worried that the tags might vanish, but when I opened the  
> > files in
> > both MP3Tag and Rio Manager all of the tags were there and correct.
> >
> > I understand the -8 -nb and -nw, but what exactly is -r
> "recursive"?
> >
> > Thanks again!
> >
> > Now the only question is how many days it will take to re-encode  
> > over 1200
> > CDs on a circa 2000 P4 (socket 723 I think) with 256MB RAM?
> >
> > Tim
> >
> >
> >> Hi Tim,
> >>
> >> I threw something together tonight that might help: http:// 
> >> cdtag.com/download/reflac.zip (freeware/open source)
> >>
> >> The command line syntax is pretty simple.. it'll be something like
>  
> >> this:
> >> reflac -r -8 -nw -nb
> >>
> >> Which is, respectively:
> >> recursive, compression level 8, no child windows, no backups
> >>
> >> Of course, set it to suit your own tastes.. I ran it on my own  
> >> collection and it did the trick.
> >>
> >> -Jud
> 
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