INTERACT FORUM
More => Old Versions => JRiver Media Center 26 for Windows => Topic started by: Armak on July 08, 2020, 01:36:39 pm
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Hello, after using Convert Format to convert a track in a sacd iso to dff, the dff file has a lower bitrate as you can see in the screenshot. Is it possible to maintain the original bitrate? Can I convert it to flac instead, without loss in quality? Thank you
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how did you convert it?
i use a separate tool that simply extracts. it does not re-encode. it can output dff or dsf, the latter supports tags.
https://www.sonore.us/iso2dsd.html
some SACDs have stereo and multichannel versions. they are different sizes and i would expect different bitrates. perhaps the tool you used converted to PCM as an intermediate step?
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I did the conversion using Convert Format in JRiver's Advanced Tools menu. I also converted it using isotodsd, with the same results.
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All DSD conversions in MC and other apps go through a PCM stage in the middle, so DSD > PCM > DSD which is a lossy conversion. Otherwise, bitrate outside of lossy formats like MP3, AAC, etc. doesn't really matter.
If you're extracting DFF files from a SACD ISO, I'd recommend using sacd_extract instead as there's no conversion involved, it extracts the data from a SACD ISO into individual DFF (or DSF if you want metadata) files. It's 1:1 of the data on the original ISO, with no PCM conversions done at all.
https://github.com/setmind/sacd-ripper
GUI for it: https://github.com/setmind/SACDExtractGUI
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iso2dsd uses sacd extract (it is just a java based front end)
if he is getting the same results as when using media center, are you sure MC goes through a PCM stage?
can always hash both conversions (MD5) and see if the files truly are the same
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As far as I know, iso2dsd uses the "original" sacd_extract, not the setmind fork where the issue with pops at the beginning of DSF files is fixed, among other things. If you're intending to split/extract SACD ISOs to DSF files, it's something to be mindful of. Of course if you're using DFF files, this won't be an issue for you (but why would you use DFF files over DSF files, when DSF files support metadata?).
And before you say it, yes, I know the latest "original" sacd_extract release (and latest Github comments) is supposed to have the DSF pop fixed, but it's actually not. It's only fixed in the setmind fork of sacd_extract right now.
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Thank you for your suggestions...I did a conversion with iso2dsd in dsf format and it has the same bitrate as the dff file, but it supports metatags so i 'll stick with this for now