More > JRiver Media Center 23 for Windows
Request change in handling of multi-channel
thecrow:
I can think of at least 3 different 7.1 surround formats:
1) Left, Center, Right, Left Side, Right Side Left Rear, Right Rear and Sub
2) Left, Inner Left, Center, Inner Right, Right, Left Surround, Right Surround and Sub
3) Left Height, Left, Center, Right, Right Height, Left Surround, Right Surround and Sub
All have an LFE
RD James:
--- Quote from: kr4 on February 08, 2018, 06:03:01 pm ---Yes, it is behaving as intended. I am not disputing it but, as you point out, it is not behaving appropriately in all instances for all people.
--- End quote ---
I think you're misunderstanding the problem. There is nothing for Media Center to fix; you need to select the appropriate number of output channels for your device (5.1 / 7.1) if you are using a DAC rather than an AVR or Sound Card (or an AVR/Sound Card which lacks support for formats like 4.0).
Then Media Center handles the channel mapping rather than passing it through as-is for the device to handle.
dtc:
--- Quote from: thecrow on February 09, 2018, 07:58:25 am ---I can think of at least 3 different 7.1 surround formats:
1) Left, Center, Right, Left Side, Right Side Left Rear, Right Rear and Sub
2) Left, Inner Left, Center, Inner Right, Right, Left Surround, Right Surround and Sub
3) Left Height, Left, Center, Right, Right Height, Left Surround, Right Surround and Sub
All have an LFE
--- End quote ---
Pretty sure the Inner and Height channels are not typically stored in a 7.1 file. The are usually generated within the receiver. They can be stored in a higher level file format.
Here is the normal order in a file for a 7.1 file
1 Front Left - FL
2 Front Right - FR
3 Front Center - FC
4 Low Frequency - LF
5 Surround Left - SL
6 Surround Right - SR
7 Back Left - BL
8 Back Right - BR
Note that the terms Surround (or Side) and Back sometimes get interchanged. But the 5/6 positions are for the speakers in a typically 5.1 setup and the 7/8 positions are for the additional speakers in a 7.1 setup, which are typically behind the listener.
Fitzcaraldo215:
--- Quote from: Hendrik on February 08, 2018, 06:48:45 pm ---I don't think this is true. The default channel layout for 6 channels without any layout indication is 5.1, and I also checked the DSD input plugin just in case it might override this - it does not.
--- End quote ---
I have not tested this recently. But, I clearly had a channel mismatch problem when using Source Number of Channels when playing Mch SACDs into a USB DAC. Kal and quite a few others here and in other forums did too. Changing the output to 5.1 fixed it in all cases I am aware of for both 5.0 and 5.1 files.
As I said previously, I determined this by observing the instaneous channel-by-channel level indicators in my Exasound driver. It has been awhile, and I am not sure if the problem occurred on 5.0 or 5.1 files. I recall that one was OK and the other was not. Note also that I was using JR bass management, which might or might not have affected the issue. Also, I was using Dirac Live DAP at the time, now VST plugin, on my PC ahead of the Exasound driver in the signal path. It is doubtful that Dirac had an effect on channel misalignment.
I have no idea what was happening before that into an Integra prepro via HDMI, where I did not use bitstreaming but used JR bass management. It might or might not have been the same. But, others have reported a similar issue using Mch processors, again fixed by using 5.1 as the output parameter. If they were doing bass management in the processor, misassigment of the sub channel might not be noticeable, since the deep bass would still be redirected to the sub by the processor's bass management.
RD James:
--- Quote from: Fitzcaraldo215 on February 09, 2018, 10:26:10 am ---I have not tested this recently. But, I clearly had a channel mismatch problem when using Source Number of Channels when playing Mch SACDs into a USB DAC. Kal and quite a few others here and in other forums did too. Changing the output to 5.1 fixed it in all cases I am aware of for both 5.0 and 5.1 files.
--- End quote ---
Then the issue is that your DAC does not handle the unmapped input correctly, not that Media Center is doing anything wrong.
As I explained earlier in this topic, this is because DACs are typically 'dumb' devices that map channels 1:1 while AVRs and Sound Cards will remap channels automatically based on the input format.
Media Center will do that remapping itself if your playback device does not support it, if you select a specific output format such as 5.1 or 7.1 rather than "source channels".
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