Le 2018-07-29 à 03:08 PM, Stefan Schreiber a écrit :
Citando Marc Lavallée <m...@hacklava.net>:
Excerpt from https://xiph.org/flac/faq.html#general__channels :
"FLAC supports from 1 to 8 channels per stream. Channels are only
grouped in FLAC to take advantage of interchannel correlation and to
define common channel assignments (like stereo L/R, 5.1 surround, et
cetera). When encoding a large number of independent channels it is
expected that they are coded separately and if required, multiplexed
together in a suitable container like Ogg or Matroska."
Good info.
But this is a bit typical as an “answer”: HOW would you code many
channels separately in Flac (available sw to use etc.), and how to
multiplex into a “suitable container”?
Ok, no problem for anybody else... I am supposed to see! 😇
(https://xiph.org/flac/ogg_mapping.html
They don’t explain this at all, unless you take the faq answer as a
definition.)
Best,
Stefan
P.S.: They just have to extend (too) old definitions.
As Fons says, the limit is a limit (paraphrasing Theresa May) - and
not justified from a current perspective.
A few years ago I hacked the opusenc command line tool to encode
channels without inter-channel correlation, because the correlations in
the Opus codec were programmed for specific multi-channel schemes,
limited to 8 channels. The "joint stereo" MP3 mode is an example of such
a scheme, where channels are internally converted before encoding (see:
https://en.wikipedia.org/wiki/Joint_%28audio_engineering%29).The Opus
codec now have an Ambisonics mode with new inter-channel correlation
schemes. I don't know if the fine Xiph developers can "just" extend the
definitions of FLAC, if a special Ambisonics mode would be required, and
to what extent the 8-channel limit (as a limit) is a political issue.
For the multiplexing of multiple streams in a suitable container, it is
left as an exercise. And if the issue is just disk space, file
compression softwares (zip, gzip, etc) are still valid tools.
Marc
Le 2018-07-29 à 02:20 PM, Fons Adriaensen a écrit :
On Sun, Jul 29, 2018 at 01:46:04PM -0400, Marc Lavallée wrote:
Easy to compile, support for FLAC, GPL3 license...
FLAC is supported for input only. The output is 9 channels,
and FLAC can't handle that. Never understood why they put
in that silly limit...
Ciao,
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