Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2013-03-05 Thread rsdio
On Jan 1, 2013, at 13:02, Ralph Giles wrote: > On 12-10-12 4:47 AM, Erik de Castro Lopo wrote: >> I've read through this thread and it didn't really come to any >> conclusion. Can we try again and make a decision this time? > > Anyone else have thoughts on this? I'd like to get this added > befo

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2013-01-26 Thread Erik de Castro Lopo
Martijn van Beurden wrote: > 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

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2013-01-26 Thread 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 Willough

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2013-01-21 Thread Brian Willoughby
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 medi

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2013-01-17 Thread Ralph Giles
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? -r ___ flac-dev mailing list flac-dev@xiph.org http://lists.xiph.org/mail

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2013-01-17 Thread Ralph Giles
On 13-01-17 7:26 PM, Brian Willoughby wrote: > I vote for documenting the --channel-map option in the --help I suspect it's undocumented because 'none' is the only implemented argument, which is a way to work around the defined channel map signalling. I.e. it doesn't make interoperable files. -r

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2013-01-17 Thread Brian Willoughby
I vote for documenting the --channel-map option in the --help I don't like the idea of rejecting a multichannel file merely for mapping, so there should be a documented option plus an error message pointing to the option. This should compare to the WAVE and AIFF errors where the utility sugg

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2013-01-17 Thread Ralph Giles
On 13-01-01 4:36 PM, Tim W. wrote: > - 4 channels: left, right, back left, back right (FL FR BL BR) > - 5 channels: left, right, center, back/surround left, back/surround right > (FL FR FC BL BR or FL FR FC SL SR, same order so doesn't matter) > - 6 channels: left, right, center, LFE

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2013-01-03 Thread Martin Leese
"Stephen F. Booth" wrote: ... > http://msdn.microsoft.com/en-us/library/windows/hardware/gg463006.aspx > hasn't been updated since 2007 so I may have been looking at an old > document. The document you cite is the Mircosoft standard; its usual URL is: http://msdn.microsoft.com/en-us/windows/hardwa

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2013-01-02 Thread Ralph Giles
On 13-01-02 3:16 PM, Stephen F. Booth wrote: > I think we may be butting up against an area where the standards aren't clear. That's the conclusion I came to. Earlier today I looked through http://read.pudn.com/downloads122/ebook/519453/EIA-CEA-861-B.pdf, which defines speaker configurations for

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2013-01-02 Thread Stephen F. Booth
Tim's proposal seems reasonable but it conflicts with the FLAC documentation that says the channel ordering follows SMPTE/ITU-R recommendations. I think we may be butting up against an area where the standards aren't clear. ITU-R BS.2159-4 (http://www.itu.int/dms_pub/itu-r/opb/rep/R-REP-BS.21

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2013-01-02 Thread Erik de Castro Lopo
Tim W. wrote: > I'm personally in favor of mapping (1) as it doesn't vary between 6.1/7.1, > and is fully compatible with the WAVEFORMATEXTENSIBLE specification. I'm in favour of Tims proposal and intent to apply Ralph's patch to implement this unless someone comes up with a really good reason no

[flac-dev] Define 6.1 and 7.1 channel mappings

2013-01-01 Thread Tim W.
I apologize for the terribly long message, but here goes. - First, regarding existing tools that I now about. libavcodec and users (e.g. HandBrake): - if there are 6 channels or less, the layout is s

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2013-01-01 Thread Ralph Giles
On 12-10-12 4:47 AM, Erik de Castro Lopo wrote: > I've read through this thread and it didn't really come to any > conclusion. Can we try again and make a decision this time? Anyone else have thoughts on this? I'd like to get this added before the 1.3.x release. Especially helpful would be resear

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2012-10-12 Thread Erik de Castro Lopo
Ralph Giles wrote: > The FLAC format specification never defined the semantics of 7- and > 8-channel files, which has caused some pain for some years now. > > Attached is a patch to define them. I don't know if this follows > "follows SMPTE/ITU-R recommendations," but it follows common tool > pra

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2012-09-24 Thread Stephen F. Booth
On Sunday, September 23, 2012 at 2:04 PM, Ralph Giles wrote: > On Fri Sep 21 16:31:21 2012, Stephen F. Booth wrote: > > > 6.1: L R C LFE Ls Rs Cs (MPEG 6.1 A layout) I should have been clearer with the labels I was using: L = Left R = Right C = Center LFE = Low frequency effects Ls = Left surroun

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2012-09-23 Thread Ralph Giles
On Fri Sep 21 16:31:21 2012, Stephen F. Booth wrote: > 6.1: L R C LFE Ls Rs Cs (MPEG 6.1 A layout) Having read a bit more: This matches the WAV (or USB) order if you map Ls (Left Surround?) to Back Left and Rs (Right surround) to Back Right, instead of mapping them to Side Left and Side Right a

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2012-09-21 Thread Ralph Giles
On Fri Sep 21 16:31:21 2012, Stephen F. Booth wrote: > 6.1: L R C LFE Ls Rs Cs (MPEG 6.1 A layout) I'm confused. WAV puts the rear centre before everything but 'Front left of center' and 'Front right of center'. Are you saying you prefer the extra front channels to to side/rear surround, or th

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2012-09-21 Thread Stephen F. Booth
I like the idea of standardizing the channel maps. I would suggest the following channel orderings: 6.1: L R C LFE Ls Rs Cs (MPEG 6.1 A layout) 7.1: L R C LFE Ls Rs Rls Rrs (MPEG 7.1 B layout) I think this more closely matches what Apple has done and what the default WAVE channel order is

Re: [flac-dev] Define 6.1 and 7.1 channel mappings

2012-09-21 Thread Justin Ruggles
On 09/21/2012 05:22 PM, Ralph Giles wrote: > The FLAC format specification never defined the semantics of 7- and > 8-channel files, which has caused some pain for some years now. > > Attached is a patch to define them. I don't know if this follows > "follows SMPTE/ITU-R recommendations," but it fo

[flac-dev] Define 6.1 and 7.1 channel mappings

2012-09-21 Thread Ralph Giles
The FLAC format specification never defined the semantics of 7- and 8-channel files, which has caused some pain for some years now. Attached is a patch to define them. I don't know if this follows "follows SMPTE/ITU-R recommendations," but it follows common tool practice. I chose the set of surrou