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IDProjectCategoryView StatusLast Update
0006302MMW v4Conversion/Levelingpublic2012-03-25 23:35
ReporterTeknojunkyAssigned To 
PriorityhighSeveritymajorReproducibilityalways
Status resolvedResolutionno change required 
Product Version3.2.1 
Target Version4.1 
Summary0006302: conversion ALAC ---> FLAC is not lossless
DescriptionWhen testing conversion of apple lossless files (m4a) with CueTools + AccurateRip, the MM converted flac files are no longer 'accurate'. However conversion of same files with dbpoweramp, the flac files remain accurate.

reproduction steps
- start with apple lossless rip of cd that is verified accurate by cue tools (mine was originally ripped with dbpoweramp cd ripper to ALAC and verified accurate during rip, and post-rip by cuetools)
- convert ALAC files to FLAC files with mediamonkey
- test FLAC files with cue tools, cue tools reports disk not present in database

also tested with foobar 1.0, right click flac files in foobar > utilities > verify with accurate rip = AccurateRip verification failed: Not a correct gapless rip
Additional Informationfoobar > bit comparison also failed on some tracks (but some are good)
TagsNo tags attached.
Fixed in build

Activities

michal

2012-02-19 10:13

developer   ~0030456

Last edited: 2012-02-19 10:21

I cannot reproduce any data loss. I converted WAV -> ALAC -> FLAC -> WAV and the WAV files have every bit of data the same. I don't know where could be the problem...

peke

2012-02-20 02:25

developer   ~0030459

@Teknojunky and Michal
Is there any difference in files eg. Data chunks or Chunk numbers content. I new in the past that some calculated CRCs wrom whole file and not from Data part?

michal

2012-02-20 08:23

developer   ~0030461

Last edited: 2012-02-20 08:23

The only difference in my case was in metadata, MediaMonkey wrote itself as encoder.

peke

2012-03-25 23:35

developer   ~0030771

I can confirm that. Setting as No change required.