[flac-dev] Define 6.1 and 7.1 channel mappings

[Martijn van Beurden]

Hi guys,

While updating the FLAC website I just found out the Xiph directshow 
filters already implement a certain channel mapping. I found this bug: 
https://trac.xiph.org/ticket/1657 It seems, from the bug report, that 
they use FL, FR, FC, LFE, BL, BR, SL, SR.

On 22-01-13 08:19, Brian Willoughby wrote:
> On Jan 17, 2013, at 21:41, Ralph Giles wrote:
>> On 13-01-17 7:26 PM, Brian Willoughby wrote:
>>> I vote for documenting the --channel-map option in the --help
>> Do you ever use --channel-map yourself, or recommend it to clients?
>
> Professional surround mastering is delivered on very specific media,
> and FLAC is not an option (to my knowledge).
>
> I use FLAC for archival of original recordings, and I document the
> channel order along with the other details of the recording. I
> recommend the same practice to anyone. FLAC works best with mono and
> stereo. Only stereo can take advantage of compression options that
> share channels. More than two channels in a FLAC does not really
> offer any space savings beyond what you would get with multiple mono
> FLAC files. But if you do archive 8-channels recordings, you'd be
> well advised to document more than just the channel mapping.
>
> Actually, there's quite a large world of possibilities. There are
> recording devices, archival methods, media exchange standards for
> mastering, and only after all of those stages is there delivery to
> the consumer. I'm not aware of any surround material being delivered
> in FLAC yet, neither to mastering houses or consumers. It seems that
> surround is mostly limited to Dolby Digital, DTS, and is limited to
> DVD and BD (Blu-ray Disc). I have seen some new things popping up,
> but many of them look really ugly in one aspect or another.
>
> Are you aware of FLAC being used apart from recording devices (1 to 8
> channels), archival (multiple mono and stereo), computer audio, or
> consumer stereo audio? It seems that there are two areas where
> surround FLAC could take off (mastering formats and consumer media).
>
> Brian
>
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