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aacPlus CODEC Pre-Processing... https://forums.stereotool.com/viewtopic.php?f=8&t=305 |
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Author: | SuperH [ Fri Dec 12, 2008 11:35 pm ] |
Post subject: | Re: aacPlus CODEC Pre-Processing... |
The "slushiness" I am referencing is CODEC related. The processing scheme that I've been working on -- using your DSP -- is trying to reduce the slushiness that is inherent to low bitrate HE-AAC (aacPlus). I don't know how old you are, or what your career ambitions are, but in my opinion, there is room for a fourth major player in the audio processing arena. We have Orban, Omnia, and Neural Audio now (and countless other little "guys"). There's room for an HVZ! Seriously, we need equipment from people who LISTEN to music! The fact that you've designed a software application "plug-in" that is comparable -- and better in many areas, than audio equipment that costs several thousands of dollars (often tens of) blows my mind. Keep up the good work! |
Author: | SuperH [ Mon Jan 05, 2009 4:08 pm ] |
Post subject: | Re: aacPlus CODEC Pre-Processing... |
Hey... wanted to give an update. I changed the way I'm processing audio completely. This seems to do a better job with handling the artifacts. http://superh.dyndns.org:8000/listen.pls CODEC: aacPlus V2/Parametric Stereo/40kbps/44.1kHz As always, feedback is awesome. HVZ: Your software is amazing! Update: I found I was able to drop the bitrate to 40kbps without sacrificing substantial quality. |
Author: | SuperH [ Sun Feb 08, 2009 7:20 pm ] |
Post subject: | Re: aacPlus CODEC Pre-Processing... |
So... go ahead and give'er a listen! The idea is to optimize aacPlus at low bitrates, so the top two links are the important ones: http://superh.dyndns.org:8000/listen.m3u 40kbps aacPlus V2 (Parametric Stereo) 44.1kHz http://superh.dyndns.org:8000/test.m3u 32kbps aacPlus V1 (Stereo) 44.1kHz Here is 128kbps MP3 for reference: http://superh.dyndns.org:8000/high.m3u 128kbps MP3 (Stereo) 44.1kHz I think I attacked most of the annoying artifacts without coloring the audio too much. It's always a work in progress, but I'm extremely content with this. Audio is very dynamic, yet normalized. I hate how much I have to manipulate the stereo image to kill so many artifacts. That's not as true as I'd like it. Code: [Common] Pre amplifier=5 Post amplifier=0.75 Extra loudness=1 Hard limit output=1 Process for low latency=1 Mode=Advanced [Noise Gate] Enabled=1 Difference=0 Noise level=2.200000048 [Singleband Compressor] Enabled=0 Difference=0 Maximum volume=1.5 Maximum value=24576 Attack speed=0.00009 Decay speed=0.100000001 Above Top Limiter=0 [Pre Compressor] Enabled=1 Difference=0 Delay enabled=0 Maximum volume - Band 1=40010 Maximum volume - Band 2=5500 Attack speed - Band 1=0.000002059 Attack speed - Band 2=0.000002059 Decay speed - Band 1=0.0004578 Decay speed - Band 2=0.0004578 [Multiband Compressor] Enabled=1 Difference=0 Delay enabled=0 Very high quality enabled=1 Maximum volume - Band -1=4410 Maximum volume - Band 0=4070.000244141 Maximum volume - Band 1=4400 Maximum volume - Band 2=3100 Maximum volume - Band 3=3250 Maximum volume - Band 4=5650 Maximum volume - Band 5=3550 Maximum volume - Band 6=2700 Maximum volume - Band 7=3100 Maximum volume - Band 8=3950 Attack speeds linked=1 Attack speed - Band -1=0.000027837 Attack speed - Band 0=0.000027837 Attack speed - Band 1=0.000027837 Attack speed - Band 2=0.000027837 Attack speed - Band 3=0.000027837 Attack speed - Band 4=0.000027837 Attack speed - Band 5=0.000027837 Attack speed - Band 6=0.000027837 Attack speed - Band 7=0.000027837 Attack speed - Band 8=0.000027837 Decay speeds linked=1 Decay speed - Band -1=0.002081846 Decay speed - Band 0=0.002081846 Decay speed - Band 1=0.002081846 Decay speed - Band 2=0.002081846 Decay speed - Band 3=0.002081846 Decay speed - Band 4=0.002081846 Decay speed - Band 5=0.002081846 Decay speed - Band 6=0.002081846 Decay speed - Band 7=0.002081846 Decay speed - Band 8=0.002081846 Above Top Limiter=1 Clipping enabled=1 Postprocessing enabled=1 Relative clip position - Band -1=2.508771658 Relative clip position - Band 0=2.508771658 Relative clip position - Band 1=2.508771658 Relative clip position - Band 2=1.857142687 Relative clip position - Band 3=1.857142687 Relative clip position - Band 4=1.352941036 Relative clip position - Band 5=1 Relative clip position - Band 6=0.801801801 Relative clip position - Band 7=0.709401608 Relative clip position - Band 8=0.801801801 Final limiter value=0.5 Final limiter decay speed=0.000239358 Final limiter clipping=0.307189584 Equalizer enabled=1 Equalize before multiband-compression=0 Equalizer position - Band -1=1.702702761 Equalizer position - Band 0=1.702702761 Equalizer position - Band 1=1.352941036 Equalizer position - Band 2=1 Equalizer position - Band 3=1 Equalizer position - Band 4=1 Equalizer position - Band 5=1 Equalizer position - Band 6=1 Equalizer position - Band 7=1 Equalizer position - Band 8=1 [Stereo] Enabled=1 Delay enabled=0 Difference=0 Center bass=1 AZIMUTH limit=75.61000061 AZIMUTH change speed=0.300000012 Image phase amplifier=1.600000024 Image phase amplifier maximum angle=90 Image phase amplifier maximum separation strength=75.169998169 Image width amplifier=0.75 Extra phase shift=0 Mono or stereo only=-1 [Channel Delay] Enabled=0 Left Delay=0 [Output Filter] Enabled=1 Lowpass filter=16500 Highpass filter=20 [Final Pre-Limiter] Enabled=1 Difference=0 Pre-amp=1.230895996 Response time=0.025 [Final Limiter] Enabled=1 Difference=0 Pre-amp=1.595456004 Response time=0.0125 [FM Transmitter] Enabled=0 Pre-emphasize=0 Pre-emphasis time=50 Output is pre-emphasized=0 Stereo encoder enabled=0 RDS encoder enabled=0 Pilot signal volume=9 RDS signal volume=4.5 FM overdrive volume=1 RDS PS text=2s:STEREO/2s:TOOL/<1=1.5s,2..-2=2t,-1=1.5s:WWW.STEREOTOOL.COM RDS RadioText text=60s:Stereo Tool: Professional Audio Processing - www.stereotool.com/30s:Stereo Tool by Hans van Zutphen, 1999-2008 - www.stereotool.com RDS PTY=0 RDS PI=65535 RDS Alternative frequency 1=0 RDS Alternative frequency 2=0 RDS Alternative frequency 3=0 RDS Alternative frequency 4=0 RDS Alternative frequency 5=0 RDS Alternative frequency 6=0 RDS Alternative frequency 7=0 RDS Alternative frequency 8=0 RDS Alternative frequency 9=0 RDS Alternative frequency 10=0 RDS Alternative frequency 11=0 RDS Alternative frequency 12=0 RDS Alternative frequency 13=0 RDS Alternative frequency 14=0 RDS Alternative frequency 15=0 RDS Alternative frequency 16=0 RDS Alternative frequency 17=0 RDS Alternative frequency 18=0 RDS Alternative frequency 19=0 RDS Alternative frequency 20=0 RDS Alternative frequency 21=0 RDS Alternative frequency 22=0 RDS Alternative frequency 23=0 RDS Alternative frequency 24=0 RDS Alternative frequency 25=0 RDS TP=0 RDS TA=0 RDS Music=1 RDS Artificial Head=0 RDS Compressed=1 RDS Dynamic PTY=0 RDS RadioText Enabled=1 RDS ClockTime Enabled=1 FM Transmitter Calibration Enabled=0 MPX Oversampling mode=Follow main Quality setting FM Transmitter Calibration - Volume 20 Hz=1 FM Transmitter Calibration - Volume 40 Hz=1 FM Transmitter Calibration - Volume 80 Hz=1 FM Transmitter Calibration - Volume 160 Hz=1 FM Transmitter Calibration - Volume 320 Hz=1 FM Transmitter Calibration - Volume 640 Hz=1 FM Transmitter Calibration - Volume 1280 Hz=1 FM Transmitter Calibration - Volume 2560 Hz=1 FM Transmitter Calibration - Volume 5120 Hz=1 FM Transmitter Calibration - Volume 10240 Hz=1 FM Transmitter Calibration - Volume 19000 Hz=1 FM Transmitter Calibration - Volume 23000 Hz=1 FM Transmitter Calibration - Volume 28000 Hz=1 FM Transmitter Calibration - Volume 33000 Hz=1 FM Transmitter Calibration - Volume 38000 Hz=1 FM Transmitter Calibration - Volume 43000 Hz=1 FM Transmitter Calibration - Volume 48000 Hz=1 FM Transmitter Calibration - Volume 53000 Hz=1 FM Transmitter Calibration - Volume 57000 Hz=1 FM Transmitter Calibration - Phase shift 20 Hz=0 FM Transmitter Calibration - Phase shift 40 Hz=0 FM Transmitter Calibration - Phase shift 80 Hz=0 FM Transmitter Calibration - Phase shift 160 Hz=0 FM Transmitter Calibration - Phase shift 320 Hz=0 FM Transmitter Calibration - Phase shift 640 Hz=0 FM Transmitter Calibration - Phase shift 1280 Hz=0 FM Transmitter Calibration - Phase shift 2560 Hz=0 FM Transmitter Calibration - Phase shift 5120 Hz=0 FM Transmitter Calibration - Phase shift 10240 Hz=0 FM Transmitter Calibration - Phase shift 19000 Hz=0 FM Transmitter Calibration - Phase shift 23000 Hz=0 FM Transmitter Calibration - Phase shift 28000 Hz=0 FM Transmitter Calibration - Phase shift 33000 Hz=0 FM Transmitter Calibration - Phase shift 38000 Hz=0 FM Transmitter Calibration - Phase shift 43000 Hz=0 FM Transmitter Calibration - Phase shift 48000 Hz=0 FM Transmitter Calibration - Phase shift 53000 Hz=0 FM Transmitter Calibration - Phase shift 57000 Hz=0 [Direct soundcard access] Enabled=0 Device ID=Microsoft Sound Mapper Volume=1 Buffer size=1 Send to Winamp=Nothing ASIO Override channel 1=4 ASIO Override channel 2=5 [Low latency output] Enabled=0 Device ID= Volume=1 Buffer size=0.079999998 ASIO Override channel 1=2 ASIO Override channel 2=3 |
Author: | hvz [ Mon Feb 09, 2009 11:37 pm ] |
Post subject: | Re: aacPlus CODEC Pre-Processing... |
Impressive, not bad at all considering the low bitrate! I have 3 minor tips: 1. I think the noise gate is set a bit too agressive. (Of course, it could be that this helps the encoder, in which case you should leave it as it is) 2. I noticed that you have "Low latency" processing enabled - if you need it, great, but if you don't, turning it off will (slightly) improve the sound quality. Although I doubt that the difference will be noticeable. 3. About the Stereo filtering: The "Limit" (90 degrees) slider causes artifacts. My own experience is that I'm getting better results with Limit set to 180 degrees, and "max phase" at 30-40 %. Again, this may be different when using very low bitrate encoding. I'll see if I can improve this in a future version (but I've tried it before and I didn't manage to). |
Author: | SuperH [ Tue Feb 10, 2009 2:57 am ] |
Post subject: | Re: aacPlus CODEC Pre-Processing... |
Thanks! I forgot about the Low Latency setting. I was using it to better analyze the effects. The noise processing too -- -- I removed a bunch of noisy (hissy) tracks, and forgot to back that off a bit. I'm trying to use that to make the change in multiband levels not noticeable. You know -- the hiss sound that changes with the multiband. I started with the width set at 180 degrees, but I was losing a lot of information with that setting -- it's the fault of the CODEC. Notably, the cowbell in Funkytown by Lipps Inc and the guitars in Radar Love by Golden Earring would completely disappear. aacPlus is a fun CODEC if you want to make your encoder do some funky stuff, that's for sure. I'll keep working on it. Thanks for the feedback! Tweaked on processing. http://superh.dyndns.org:8000/listen.pls Switched CODEC: aacPlus/Parametric Stereo/40kbps/44.1kHz |
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