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4th November 2009, 12:28 | #1 | Link |
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MeGUI - Audio too loud
When I was using analog audio on my computer I've nerver mind the audio volume of the videos encoded with MeGUI, but after switch to digital connection with my HT I've noticed that the audio is too loud and with some saturation.
Since I use different sources to encode is hard to guess how to propper normalise the audio, my videos are encoded with x264 DXVA-HD-HQ + Nero AAC LC 64Kbps. Normally what I do now is to use "wavegain" with the follow command: Code:
wavi.exe job1.avs AUDIO.wav Found PCM audio: 2 channels, 48000 Hz, 16 bits, 346.680000 seconds. Writing WAV file "AUDIO.wav"... WAV file written successfully. Code:
wavegain -l -f audio.log -y AUDIO.wav Analyzing... Gain | Peak | Scale | New Peak |Left DC|Right DC| Track | | | |Offset | Offset | -------------------------------------------------------------- +4.39 dB | 12211 | 1.66 | 20241 | 0 | 0 | AUDIO.wav Applying Gain of +4.39 dB to file: AUDIO.wav WaveGain Processing completed normally Code:
neroAacEnc.exe -cbr 64000 -lc -if AUDIO.wav -of "AUDIO.m4a" Code:
del AUDIO.wav Thanks. |
4th November 2009, 18:55 | #3 | Link |
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For multichannel materials you still can use 'peaks'.
Normalizing audio by 'peaks' you can get errors with some audio materials that need reduction. The idea is to add an option for automatic normalization with stereo audio. |
5th November 2009, 01:39 | #4 | Link | |
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Quote:
Only if you select values over 100% you can get errors.
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6th November 2009, 12:35 | #5 | Link | |
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Quote:
Boosting levels to 0dB might not make the audio clip, but don't forget that it will if it get processed or filtered by EQ for example, that is exactly what is happening with the defaul value of 100%. The problem is that the tool is not smart enought to decide the propper gain value, instead of a fixed 100% peak. You might read something called intersample peaks: http://en.wikipedia.org/wiki/DBFS |
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6th November 2009, 13:39 | #6 | Link | ||
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I'm sure, but if you aren't you can put the desired value.
Quote:
Quote:
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6th November 2009, 14:15 | #7 | Link | ||
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What is best?
What I desire or what should be done properly? Quote:
Quote:
And in cases like this a more sofisticated software as mentioned before, it is, justifiable. |
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6th November 2009, 18:51 | #9 | Link |
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Here it is:
http://www.4shared.com/file/14747352...les-MeGUI.html Original sample.avs script: Code:
DirectShowSource("E:\video.avi") Trim (191,1090).fadeout(5) Code:
wavi.exe sample.avs AUDIO - Original.wav Found PCM audio: 2 channels, 48000 Hz, 16 bits, 30.063375 seconds. Writing WAV file "AUDIO - Original.wav"... WAV file written successfully. AUDIO - MeGUI.mp4 is the source encoded with MeGUI with 'peak' at 100% with profile "Nero AAC LC 64Kbps". AUDIO - wavegain.mp4 is the source normalized with wavegain and encoded with neroAacEnc. This are the command used to make the last sample: wavegain Code:
wavegain -l -f audio.log -y AUDIO - wavegain.wav Analyzing... Gain | Peak | Scale | New Peak |Left DC|Right DC| Track | | | |Offset | Offset | -------------------------------------------------------------- +2.30 dB | 12089 | 1.30 | 15754 | 0 | 0 | AUDIO.wav Applying Gain of +2.30 dB to file: AUDIO - wavegain.wav WaveGain Processing completed normally Code:
neroAacEnc.exe -cbr 64000 -lc -if "AUDIO - wavegain.wav" -of "AUDIO - wavegain.mp4" ************************************************************* * * * Nero AAC Encoder * * Copyright 2008 Nero AG * * All Rights Reserved Worldwide * * * * Package build date: Sep 17 2008 * * Package version: 1.3.3.0 * * * * See -help for a complete list of available parameters. * * * ************************************************************* Processed 29 seconds... |
7th November 2009, 01:31 | #10 | Link |
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Seems a problem with your HT settings.
The Normalized 100% don't have any problem, only is 6 dB loud, but without clips. Many users claim for more volume and you want less. Is dificult satisfy to everybody. BTW, I never recommend use the Normalize function, only when use a downmix or experiment low volume. This track have -25 dB RMS and don't need amplify the volume. Cheers
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7th November 2009, 10:07 | #11 | Link | |||
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I don't think so, unless the person that listen to the file has some hearing loss any one can notice that the audio is saturated and if you EQ that, it will distort.
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Is impossible to only use a reference value like 100%, 90% etc. You are deciding this values by guess instead of what you really need. Again, depending on the source that you are working with you need to cut the volume to a certain level and not 'always' boost, like this example. Code:
Analyzing... Gain | Peak | Scale | New Peak |Left DC|Right DC| Track | | | |Offset | Offset | -------------------------------------------------------------- -6.01 dB | 32517 | 0.50 | 16278 | 0 | 0 | AUDIO.wav Applying Gain of -6.01 dB to file: AUDIO.wav WaveGain Processing completed normally Wavegain is opensource, anyone can download the source and add support for multichannel audio if this is the case. Quote:
One can't decide without a tool to analyze and apply the propper values. This track was an example, not all captures has this value since I capture from DTV, VHS, Hi8, DV, Betacam etc. |
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7th November 2009, 12:09 | #12 | Link |
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- I'm not a MeGUI developper, only a user. Then I say only my opinion.
- Everybody can listen your samples. Normalize never boost, only amplify, all dynamic range, until the max volume without distort. - I know ReplayGain/WaveGain longtime ago, and I don't agree with the criterion (RMS values) used to calculate the recommended gain. For me is not the same a ballade and a hard rock. - And everybody is free to use the soft desired. For me the ReplayGain/WaveGain concept is not recommended for movie audio tracks.
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