More > JRiver Media Center 21 for Windows
NEW: Volume Leveling uses the additional Headroom provided by Internal Volume
mwillems:
--- Quote from: lisbethfox on August 13, 2015, 09:17:13 am ---Jim can you clarify what exactly means?
Thanks
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The change corrects two issues with volume leveling:
1) Previously volume leveling would perform a clipping check before applying the volume leveling adjustment, but the check was done before internal volume was applied. That meant that, in effect, any music or video that needed a volume leveling adjustment greater than zero with a peak at or near zero would not get the correct volume leveling applied. Volume leveling now takes the additional headroom created by internal volume into account, so that (headroom permitting) audio and video that need a positive adjustment can receive one.
2) Additionally as part of JRiver's downmixing, video with a peak level near zero would receive significant attenuation to avoid clipping caused by summing several channels into a smaller number of channels. This was done transparently (i.e. it didn't show up as a volume reduction in the audio path). This created the effect that a stereo downmix of a 5.1 video was significantly quieter than other stereo content JRiver played. To create a more level volume, volume leveling now takes into account any extra headroom created by internal volume and uses that to reverse the volume reduction created by the downmix. As a result, with adequate internal volume headroom, volume leveling makes downmixed multi-channel audio closer in volume level to stereo audio and stereo video.
In both cases if you have internal volume maxed out, you should see no changes in behavior (it scales appropriately as volume is reduced).
lisbethfox:
--- Quote from: mwillems on August 13, 2015, 09:28:38 am ---I'm not Jim, but I was active in the threads where this change was discussed. The change corrects two issues with volume leveling:
1) Previously volume leveling would perform a clipping check before applying the volume leveling adjustment, but the check was done before internal volume was applied. That meant that, in effect, any music or video that needed a volume leveling adjustment greater than zero with a peak at or near zero would not get the correct volume leveling applied. Volume leveling now takes the additional headroom created by internal volume into account, so that (headroom permitting) audio and video that need a positive adjustment can receive one.
2) Additionally as part of JRiver's downmixing, video with a peak level near zero would receive significant attenuation to avoid clipping caused by summing several channels into a smaller number of channels. This was done transparently (i.e. it didn't show up as a volume reduction in the audio path). This created the effect that a stereo downmix of a 5.1 video to be significantly quieter than other stereo content JRiver played. To create a more level volume, volume leveling now takes into account any extra headroom created by internal volume and uses that to reverse the volume reduction created by the downmix. As a result, with adequate internal volume headroom, volume leveling makes downmixed multi-channel audio closer in volume level to stereo audio and stereo video.
In both cases if you have internal volume maxed out, you should see no changes in behavior (it scales appropriately as volume is reduced).
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Ok makes alot of sense. I don't use JRiver's internal volume control (yet, I think I probably will in the future) but I do have some other questions and you seem to know what you're talking about. Would you mind if I PM'd you?
JimH:
It would be nice if you can use this new thread on this subject. That way discussion benefits everyone.
The build thread should be used for reporting known bugs only.
mwillems:
--- Quote from: lisbethfox on August 13, 2015, 10:57:24 am ---Ok makes alot of sense. I don't use JRiver's internal volume control (yet, I think I probably will in the future) but I do have some other questions and you seem to know what you're talking about. Would you mind if I PM'd you?
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Lisbeth, feel free to ask in this thread (or start a new one) if you have any internal volume questions. To improve the forum as a resource we try to have technical discussions out in the open, and reserve PMs for private info.
I use internal volume exclusively in my setups for a lot of reasons, and am pretty familiar with the ups and downs, so fire away.
lisbethfox:
At the moment I use a receiver thats confirmed in its pure direct mode to do nothing to process the sound to create bi amped front outputs for a 5.1 rig. In the future I'm moving to a studio interface and many many more channels. However that would mean needing to control volume in software and not in hardware passively (my ideal goal but I don't want to build a 16ch passive volume control). Mainly what I'm wondering is what exactly internal volume / gain does when it comes to 'room correction'. I currently do nothing in room correction other than generation of sub signals since I have passive gain controls on my array of amps, however when its enabled i still see 'overflow' on some films (which I can confirm disappear if it or any sort of dsp is disabled, including my simple copy l to rl and r to rr to create a bi amp) show up if I have "flatline overflows" on and with clipping protection it can stick at 100 on alot of tracks which really should not be anywhere near that level. Do you know why this happens? Im sure its not worrying as it often doesn't sound bad. Just trying to better understand it for when I move to internal volume.
Thanks
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