More > JRiver Media Center 29 for Windows
LFE Mixing: Question and potential Enhancement
stewart_pk:
Apologies for the size of the images above.
I tried to make them smaller but nothing seemed to work.
One can zoom out with their browser to see them completely.
Hendrik:
As I said above, the LFE channel being within 10dB of full scale would be expected in a low-frequency heavy piece (that is mastered relatively loudly, most video content uses a lower reference level these days, because standards). The 10dB boost would serve no purpose if there always would be enough headroom to just boost the signal digitally - because then why would you not just encode it at the intended level and forget about this complexity?
Just a brief glance at my video library, the LFE channel being a similar volume to the main channels is entirely normal. Its not supposed to be 10dB quieter.
stewart_pk:
--- Quote from: Hendrik on June 11, 2022, 11:37:42 pm ---As I said above, the LFE channel being within 10dB of full scale would be expected in a low-frequency heavy piece (that is mastered relatively loudly, most video content uses a lower reference level these days, because standards). The 10dB boost would serve no purpose if there always would be enough headroom to just boost the signal digitally - because then why would you not just encode it at the intended level and forget about this complexity?
Just a brief glance at my video library, the LFE channel being a similar volume to the main channels is entirely normal. Its not supposed to be 10dB quieter.
--- End quote ---
I repeat my request has nothing to do with VIDEO audio and everything to do with AUDIO audio.
But to answer your question, I think and this is just my take on the standard for VIDEO audio to master LFE 10dB less than all other channels was decided upon for safety, so that the end user has some protection for their subwoofer although this is of course negated by AVR's and processors automatically boosting the LFE by 10dB anyway. Perhaps more likely it was decided upon for the very reason of downmixing because if the downmixing algorithm doesn't factor in the mutiplication of the LFE being mixed into multiple channels the LFE will become too loud. JRSS is doing the correct thing for VIDEO audio, no problem.
But and to repeat again there is seemingly no standard for AUDIO audio and it seems some content creators will use the VIDEO audio standard as a guide but some have ignored it as shown in my previous example. I inspected another of my DVD-Audio discs and this time the LFE peaked about -13.471dB and significantly less than the L and R channels which peak at about 0dB. So this particular disc very much appears to be mastered expecting the LFE channel to be raised by 10dB so that it would peak at -3.471dB.
EnglishTiger:
--- Quote from: stewart_pk on June 12, 2022, 12:41:01 am ---
But and to repeat again there is seemingly no standard for AUDIO audio and it seems some content creators will use the VIDEO audio standard as a guide but some have ignored it as shown in my previous example. I inspected another of my DVD-Audio discs and this time the LFE peaked about -13.471dB and significantly less than the L and R channels which peak at about 0dB. So this particular disc very much appears to be mastered expecting the LFE channel to be raised by 10dB so that it would peak at -3.471dB.
--- End quote ---
How do you know it was mastered expecting the LFE channel to be raised by 10dB so that it would peak at -3.471dB? Maybe it was mastered that way because either the mixing or mastering engineer wanted the LFE values to be lower than for the other channels.
Media Players can only react to the information fed to them from the actual media and since their is no Relevant Standard for AUDIO nobody is capable of developing a platform that alters the input data based on assumptions made by anyone other than the people who were responsible for the creation of that Media.
stewart_pk:
--- Quote from: EnglishTiger on June 12, 2022, 06:10:32 am ---How do you know it was mastered expecting the LFE channel to be raised by 10dB so that it would peak at -3.471dB? Maybe it was mastered that way because either the mixing or mastering engineer wanted the LFE values to be lower than for the other channels.
--- End quote ---
I don't know and this is the whole premise of this thread.
JRSS assumes it does know and well and truly applies that 10dB boost when downmixing. ;)
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version