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Topic: SACD to FLAC (Read 34812 times) previous topic - next topic
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Re: SACD to FLAC

Reply #50
Thanks for your help, I think I'm good to go.
I found this little standalone app which says the files are clean : Lossless Audio Checker
Tommy

Re: SACD to FLAC

Reply #51

Still, the output from dbpoweramp is larger than from foobar2000 for about 100%.
The SACD ISO (3.16 GB) converted to FLAC tracks with foobar2000 is (835 MB).
Converted with dbpoweramp the output is (1.64 GB).
I used compression level 5 in both programs.
Is there any way to check if the conversations are really lossless ?
As say they aren't lossless.
For filesize, I would say that the huge difference is probably a consequence of a different sampling rate. Check both converted file in foobar2000: are they 88200 Hz, 176400 Hz?

foobar2000's SACD plug-in allows you to change several options: sampling rate, but also some filters and also volume boost.
A few years ago I converted a SACD to FLAC 88.2 KHz with all possible filters/options.
The FLAC size varied from 900 MB (Direct, 64 fp 30 KHz lowpass) to 1.29 GB (installable FIR, 60 KHz lowpass) for a same sampling rate. It's 40% more!
The more you keep the dithered noise from SACD the more the FLAC size inflates.

Anyway if you absolutely want losslessly convert SACD, the better is to use WavPack lossless. From my experience size is similar to FLAC conversion (sometimes less, sometimes more with basic conversion options : 88200 KHz, fb2k default options). But for conveniance/compatibility FLAC is still better.

Re: SACD to FLAC

Reply #52
Thanks for your help, I think I'm good to go.
I found this little standalone app which says the files are clean : Lossless Audio Checker
This tool can't help you for the SACD —>FLAC (or any DSD —>PCM) scenario. It was created to check if FLAC files downloaded on the web are converted from MP3/AAC/…

Re: SACD to FLAC

Reply #53
To help to makes the things clearer, SACD is coded as: 2.822.400 Hz but in 1 bit only. For comparison, CD is 44.100 Hz but 16 bit.
FLAC can not handle 2.822.400 Hz/1bit. To convert any SACD stream to FLAC, a software must first reduce the 2.822.400 Hz to something more common : 44.100, 48.000, 88200, 96000, 192000Hz, and boost the resolution to 16 bit, 24 bit or why not 32 bit.
This process is not lossless: 2.822.400/1bit won't never be identical to 192.000 Hz/24bit. Therefore it's lossy (but with no audible consequences if you worry about it).
If you convert a DFF, DSF or WV (DSD) file to any lossless format, foobar2000 will warn you (because FLAC is intended to be lossless processing, and the DFF —> FLAC can't be lossless). But if you convert to MP3 or any other lossy format, foobar2000 won't warn you (because MP3/AAC are always lossy conversion).

Re: SACD to FLAC

Reply #54
That explains the difference in size I guess, foobar2000 compared to dbpoweramp and foobar2000 WavPack conversion.
I also get the warning message for WavPack which makes me think that there is no lossless conversion from SACD ISO possible.


foobar2000 SACD ISO to FLAC :



dbpoweramp DFF to FLAC :



foobar2000 SACD ISO to WV :



In addition I would like to know how I can view the sample rate for a audio file in foobar2000 ?
Tommy

Re: SACD to FLAC

Reply #55
As explained above SACD -> PCM (FLAC, WV, WAV) is never "lossless" because they are not equivalent. The difference, however, is not audible.
In addition I would like to know how I can view the sample rate for a audio file in foobar2000 ?
Right-click on the file and select "Properties". Isn't this displayed in foobar2000 status bar? You can also add a column to your playlist to display %samplerate%


 

Re: SACD to FLAC

Reply #57
If I have understood well, "someone" is asking for PDM/PWM lossless (and, why not, lossy) codecs...

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