[Abcde-users] "CD backups" produced with "abcde -1 -o flac -a default, cue" sometimes miss the first few frames

[Nicolas Boullis]

On Mon, Sep 30, 2013 at 09:58:50PM -0500, Charles Steinkuehler wrote:
> On 9/29/2013 8:43 AM, Nicolas Boullis wrote:
> > Hi,
> > 
> > Sorry for asking, but I'd really love to see this problem fixed. Is 
> > there anything I should do? Should I create an issue on Google code?
> 
> What problems are you seeing?  I wrote what I believe is the basis for
> the existing one-track ripping to flac with a cue file feature.  It
> works fine for me, but I haven't merged with the upstream abcde in a
> while (ok, a *LONG* while) so there could definitely be something broken.
> 
> Do you have particular CDs that cause issues?  IIRC, the main key to
> getting this to work correctly was to not pass a track number to the
> cdrecord, but use sectors or a "grab everything" short-hand when ripping
> one track.  If you use track numbers, the disk start and end can be
> messed with by the table of contents, and you won't get the 'hidden'
> audio on certain CDs.

I have issues with most (but not all) discs I tried.

The simplest way to reproduce the problem is to encode a whole disc in 
flac format with embedded cuesheet, and then use this "CD backup" as a 
source to re-encode it in a single flac file with embedded cuesheet.
The second backup will fail.

Another way to experience the problem is by using musicbrainz as the 
CDDBMETHOD. The lookup will succeed with the original CD but will fail 
with the "CD backup" as source.

Here is the cuesheet for a disc I experience the problem with (cuesheet 
embedded in the flac file, I don't have the original CD with me).

As I understand it, those problems are because the first 33 frames of 
the disc (before the beginning of the first track) were not ripped.

Looking at the source code in
  http://code.google.com/p/abcde/source/browse/trunk/abcde
(lines 2939 to 2959), nothing is done to rip the disc before the 
beginning of the first track. The patch I sent solved this for me with 
cdparanoia and flac inputs.


Cheers,

-- 
Nicolas Boullis
-------------- next part --------------
FILE "/media/sdb1/Musique/Ace_Of_Base-Happy_Nation_(U.S._Version)/Happy_Nation_(U.S._Version)_[CD].flac" FLAC
  TRACK 01 AUDIO
    INDEX 00 00:00:00
    INDEX 01 00:00:33
  TRACK 02 AUDIO
    INDEX 01 03:34:48
  TRACK 03 AUDIO
    INDEX 01 07:26:18
  TRACK 04 AUDIO
    INDEX 01 11:24:63
  TRACK 05 AUDIO
    INDEX 01 14:37:20
  TRACK 06 AUDIO
    INDEX 01 18:22:13
  TRACK 07 AUDIO
    INDEX 01 21:42:70
  TRACK 08 AUDIO
    INDEX 01 25:59:70
  TRACK 09 AUDIO
    INDEX 01 29:52:33
  TRACK 10 AUDIO
    INDEX 01 33:46:53
  TRACK 11 AUDIO
    INDEX 01 38:00:15
  TRACK 12 AUDIO
    INDEX 01 41:56:18
  TRACK 13 AUDIO
    INDEX 01 45:37:28
  TRACK 14 AUDIO
    INDEX 01 49:49:60
  TRACK 15 AUDIO
    INDEX 01 54:08:10
REM FLAC__lead-in 88200
REM FLAC__lead-out 170 153136956