post #16 of 199
1/28/08 at 11:51pm
Aren't you comparing a WAV to an M4A there? Perhaps I am missing something. But of course those files are going to be very different: one is compressed one isn't. Decode that M4A to a WAV and compare the WAV files.
"C:\MED_Docs\Music\01 Take It Easy 2.flac"
"C:\MED_Docs\Music\01 Take It Easy.flac"
No differences in decoded data found.
Here are the results after converting the M4A (ALAC) file to a WAV:
"C:\Users\Phil\Desktop\Vivaldi_ Four Seasons\01 Vivaldi_ Four Seasons, Op. 8_1, R.wav"
"C:\Users\Phil\Music\EAC extracted music\Antonio Vivaldi\The Four Seasons\Antonio Vivaldi - The Four Seasons Op. 8 - 01 - La Primavera (the Spring), Allegro.wav"
differences found: 16987797 sample(s), starting at 2.1626531 second(s), peak: 0.9897766 at 20.1665760 second(s), 1ch
Identical results. So apparently Foobar uncompresses the ALAC data anyway before it does a bit-compare.
IPodPJ, you are obviously doing something wrong when encoding.
EAC does not have a built-in FLAC encoder. It uses the user-defined external encoder for FLAC files. The "bitrate" drop-down on the "Compression options" has no effect when using an external encoder.
I just tested this myself to be sure:
Take It Easy - encoded using EAC/FLAC external encoder with the "bitrate" option set to 32kbps.
Take It Easy 2 - encoded using EAC/FLAC external encoder with the "bitrate" option set to 1024kbps.
Other command line options: -6 -V -T "ARTIST=%a" -T "TITLE=%t" -T "ALBUM=%g" -T "DATE=%y" -T "TRACKNUMBER=%n" -T "GENRE=%m" -T "COMMENT=%e" %s -o %d
Here is the result from Foobar bit-compare:
I'm fairly sure you are doing something wrong. I just ripped a track in iTunes to ALAC and WAV and compared them in foobar:
Comparing: "J:\iTunes\Roky Erickson\Don't Slander Me (Reissue)\01 Don't Slander Me.wav" "J:\iTunes\Roky Erickson\Don't Slander Me (Reissue)\01 Don't Slander Me.m4a" No differences in decoded data found.
|I put in a classical CD today that my neighbor loaned me, Antonio Vivaldi, Four Seasons. When I played it straight from my computer's CD player it sounded fantastic. Then I encoded it in ALAC through iTunes (as I have done with most albums in the past, even though I play them through Foobar) and it sounded like garbage. All the high end was missing. And it wasn't semi-obvious. It was so obvious a 90% deaf person could tell the difference. Even the little spectrum analyzer in Foobar was not bouncing up and down at more than half of the way from left to right. But when the CD was playing, the spectrum analyzer was bouncing up and down all the way from left to right (20Hz - 20kHz). So obviously iTunes' ALAC encoding rolls off a ton of audio data.|
ALAC isn't lossless. If it were, the file data (and therefore how it sounds) would be identical to the verified, extracted audio data that EAC grabs from a CD.