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Flac 2 channels to Flac 8.1 channels
h2g-vaka
post Jan 24 2014, 22:27
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Hello guys,

my old HDD died and with him my MP3 320kbps music collection. I decide to go with Flac now as it is lossless compression file. Thing is i was able to find only 2 channels and 1.2.1 encoded Flac files. I'm interested what's the difference between 1.2.1 and 1.3 encoded files? If there are some goods with 1.3 can i convert/encode to 1.2.1 to 1.3, and can i convert 2 channel Flac to 8.1 Flac? And how can i do that?

Thank you.
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o-l-a-v
post Jan 25 2014, 00:37
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QUOTE (h2g-vaka @ Jan 24 2014, 22:27) *
what's the difference between 1.2.1 and 1.3 encoded files?

1.3 is the stable version over 1.2.1. Both will do. There is not much difference in size (We are talking kBs of difference), so no point in converting 1.2.1 into newer 1.3. They are the same when compatibility is taken into consideration, if that's your concern.

QUOTE (h2g-vaka @ Jan 24 2014, 22:27) *
can i convert 2 channel Flac to 8.1 Flac?

Why on earth would you do that? The information of 8.1 channels is lost when downsampled to 2. There is no point in doing that. It would be a bit like converting mp3 to a lossless format. You will gain nothing but larger file size, the information is already lost.
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Makaki
post Jan 25 2014, 05:17
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You can update 1.2.1 files to 1.3.0 files (or any other update in the future). But between these two versions the difference is negligible. Actually the difference is "none" except for the version string now saying it was encoded with "1.3.0". The changelog clearly states no changes to the FLAC format.

Now there is one potential for saving space. If the files were encoded at a lesser compression level, you could re-encode them using 8 (best).

I use this command
CODE
flac -V --best -f *.flac


The -f is the important thing here, as it allows to re-encode the file in place. Internally the file will be decoded and re-encoded with the new settings. This is lossless.

This post has been edited by Makaki: Jan 25 2014, 05:18
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Porcus
post Jan 25 2014, 10:33
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QUOTE (Makaki @ Jan 25 2014, 05:17) *
The -f is the important thing here, as it allows to re-encode the file in place. Internally the file will be decoded and re-encoded with the new settings. This is lossless.


But is it safe? (Against power outages blah blah blah ...?)


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ktf
post Jan 25 2014, 11:19
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QUOTE (h2g-vaka @ Jan 24 2014, 22:27) *
and can i convert 2 channel Flac to 8.1 Flac?

Well first, there's not really a point into upconverting as far as I know. Still, if it had any benefit, FLAC has max 8 channels, so 7.1 is the maximum. Finally, 8.1 is a pretty odd format, 5.1, 7.1 and 9.1/9.2 are much more common. Why 8.1?
QUOTE (Porcus @ Jan 25 2014, 10:33) *
But is it safe? (Against power outages blah blah blah ...?)

Yes, it is. FLAC does not encode in-place, it encode to yourfilename.flac-fla'cenc (or something like that, I'm not sure what it is precisely). After the encoding is complete, the original file is deleted and the new one is renamed to replace the original. It would be a bit odd if is was designed for everything to be as safe as possible this part was forgotten, right?


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