Re: [SurroundSound] QUAD-FLACs are not in 4.0 but in 5.1

Razi, 

    It is possible that some of the programs used to generate these files generate a center channel and an LFE channel, regardless of whether there is any audio present on those channels.  In other cases, someone might have felt the need to generate a center channel from the front L and R, and maybe also generate a sub channel.    whatever the case, I would recommend you keep everything "as is" and not alter any of your files, as they may not play back right in the future (I've made this mistake).  

 - CP

-----Original Message-----
From: razi <ich.colonius@gmail.com>
To: SurroundSound <surroundsound@googlegroups.com>
Sent: Thu, Sep 26, 2019 10:00 am
Subject: [SurroundSound] QUAD-FLACs are not in 4.0 but in 5.1

Hi friends, since I´m a pensionare I have a bit more time to arrange my music-library. By this I noticed, that a lot of my multichannel-quad-files are not in 4.0 as aspected but mostly in 5.1.
Does anybody have an idea, what was the reason for that in former time? Imade, as an example, with ffmepg a channel-rearrangment in this way:

ffmpeg.exe -i "E:\DATEN\Downloads\Vom HUB\_SHARE\+++ Multi-Ch +++\VA - Surround Master [FLAC 5.1 24-96]\101 Strings - Bacharach Webb.flac" -filter_complex "channelmap=map=FL-FR|FR-FL|SL-SL|SR-SR:channel_layout=quad(side)" new.flac

 -or-

ffmpeg.exe -i "E:\DATEN\Downloads\Vom HUB\_SHARE\+++ Multi-Ch +++\VA - Surround Master [FLAC 5.1 24-96]\101 Strings - Bacharach Webb.flac" -filter_complex "channelmap=map=FL-FR|FR-FL|SL-BL|SR-BR:channel_layout=quad" new.flac

I think, it depends on your speaker configuration, what kind of mapping you will use. I tried both and doesn´t hear differences.

A reason could be, that my AV-receiver switched the BACK-channels to the SIDE-channels. My speaker configuration is as follows: 5.1.4

A further positive result is, the the space you need will reduce: 1.633.762.617 Bytes --> 1.175.328.464 Bytes in my example.

The topic above is about PCM (mostly FLAC), but it seems, the are similar files in DTS, but there would it be a bit more difficlut ...

Who has more background knowledge in this field?

Razi

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