Bug in azid makes LOUD noises in start/end of soundtrack [Archive]

SvenBent

6th July 2006, 06:12

I got this ac3 movie soundtrack.
when i play the file in MPC, the file plays fine with god volume and no noise.
But this is what happens when i try to decode to PCM .wav with azid 1.9

E:\DVD-rip\Macross Plus>azid_P4.exe -a -c normal -s dpl2 -F wav24 00.ac3 00.ac3.wav
Azid AC3 Decoder 1.9 (build 922) -- for Intel Pentium 4
Copyright (C) 1997-2003 By Midas <midas@egon.gyaloglo.hu>

[00:00:00.000] +------------------------------+
[00:00:00.000] | |
[00:00:00.000] | AC-3 DECODER CORE |
[00:00:00.000] | v1.9 (b922) |
[00:00:00.000] | for Intel Pentium 4 |
[00:00:00.000] | |
[00:00:00.000] | (C) 1997-2003 By Midas |
[00:00:00.000] | <midas@egon.gyaloglo.hu> |
[00:00:00.000] +------------------------------+
[00:00:00.000] +------ SETTINGS -----
[00:00:00.000] | Input channel configuration:
[00:00:00.000] | Left : None compression, +0dB gain
[00:00:00.000] | Center : None compression, +0dB gain
[00:00:00.000] | Right : None compression, +0dB gain
[00:00:00.000] | Sur Left : None compression, +0dB gain
[00:00:00.000] | Sur Right: None compression, +0dB gain
[00:00:00.000] | LFE : None compression, +0dB gain
[00:00:00.000] | Output configuration: 2/0
[00:00:00.000] | Ch0 [Left ]: Normal compression, +0dB gain
[00:00:00.000] | Ch1 [Right ]: Normal compression, +0dB gain
[00:00:00.000] | Output Dual mono mode: Stereo
[00:00:00.000] | Output Stereo mode: Dolby Pro Logic II
[00:00:00.000] | LFE levels: To LR -3.0dB, To LFE -INF
[00:00:00.000] | Center mix level: BSI
[00:00:00.000] | Surround mix level: BSI
[00:00:00.000] | Dialog normalization: No
[00:00:00.000] | Rear channels filtering: No
[00:00:00.000] +---------------------
[00:00:00.000] +------ BSI -----
[00:00:00.000] | Bitrate: 448 kbit (48 kHz)
[00:00:00.000] | Mode: Complete Main (CM)
[00:00:00.000] | Audio mode: 3/2 L,C,R,SL,SR+LFE
[00:00:00.000] | Center mix level: -6.0dB
[00:00:00.000] | Surround mix level: +0dB
[00:00:00.000] | Dialogue level: -27dB
[00:00:00.000] | Stream: Copyright protected, Original stream
[00:00:00.000] +----------------
[00:00:00.000] W7: Downmix overflow (0: +12.2dB)
[00:00:00.005] W7: Downmix overflow (1: +18.2dB)
[00:00:00.010] W7: Downmix overflow (0: +16.5dB)
[00:00:00.016] W7: Downmix overflow (1: +19.8dB)
[00:00:00.021] W7: Downmix overflow (0: +16.1dB)
[00:00:00.026] W7: Downmix overflow (1: +15.6dB)
[00:00:00.032] W7: Downmix overflow (0: +17.7dB)
[00:00:00.037] W7: Downmix overflow (1: +18.2dB)
[00:00:00.042] W7: Downmix overflow (0: +16.5dB)
[00:00:00.048] W7: Downmix overflow (1: +19.8dB)
[00:00:00.053] W7: Downmix overflow (0: +16.1dB)
[00:00:00.058] W7: Downmix overflow (1: +15.6dB)
[00:00:00.064] W7: Downmix overflow (0: +17.7dB)
[00:00:00.069] W7: Downmix overflow (1: +18.2dB)
[00:00:00.074] W7: Downmix overflow (0: +16.5dB)
[00:00:00.080] W7: Downmix overflow (1: +19.8dB)
[00:00:00.085] W7: Downmix overflow (0: +16.1dB)
[00:00:00.090] W7: Downmix overflow (1: +15.6dB)
[00:00:00.096] W7: Downmix overflow (0: +17.7dB)
[00:00:00.101] W7: Downmix overflow (1: +18.2dB)
[00:00:00.106] W7: Downmix overflow (0: +16.5dB)
[00:00:00.112] W7: Downmix overflow (1: +19.8dB)
[00:00:00.117] W7: Downmix overflow (0: +16.1dB)
[00:00:00.122] W7: Downmix overflow (1: +15.6dB)
[00:00:00.128] W7: Downmix overflow (0: +17.7dB)
[00:00:00.133] W7: Downmix overflow (1: +18.2dB)
[00:00:00.138] W7: Downmix overflow (0: +16.5dB)
[00:00:00.144] W7: Downmix overflow (1: +19.8dB)
[00:00:00.149] W7: Downmix overflow (0: +16.1dB)
[00:00:00.154] W7: Downmix overflow (1: +15.6dB)
[00:00:00.160] W7: Downmix overflow (0: +17.7dB)
[00:00:00.165] W7: Downmix overflow (1: +18.2dB)
[00:00:00.170] W7: Downmix overflow (0: +16.5dB)
[00:00:00.176] W7: Downmix overflow (1: +19.8dB)
[00:00:00.181] W7: Downmix overflow (0: +16.1dB)
[00:00:00.186] W7: Downmix overflow (1: +15.6dB)
[00:00:00.192] W7: Downmix overflow (0: +17.7dB)
[00:00:00.197] W7: Downmix overflow (1: +18.2dB)
[00:00:00.202] W7: Downmix overflow (0: +16.5dB)
[00:00:00.208] W7: Downmix overflow (1: +19.8dB)
[00:00:00.213] W7: Downmix overflow (0: +16.1dB)
[00:00:00.218] W7: Downmix overflow (1: +15.6dB)
[00:00:00.224] W7: Downmix overflow (0: +17.7dB)
[00:00:00.229] W7: Downmix overflow (1: +18.2dB)
[00:00:00.234] W7: Downmix overflow (0: +16.5dB)
[00:00:00.240] W7: Downmix overflow (1: +19.8dB)
[00:00:00.245] W7: Downmix overflow (0: +16.1dB)
[00:00:00.250] W7: Downmix overflow (1: +15.6dB)
[00:00:00.256] W7: Downmix overflow (0: +17.7dB)
[00:00:00.261] W7: Downmix overflow (1: +18.2dB)
[00:00:00.266] W7: Downmix overflow (0: +16.5dB)
[00:00:00.272] W7: Downmix overflow (1: +19.8dB)
[00:00:00.277] W7: Downmix overflow (0: +16.1dB)
[00:00:00.282] W7: Downmix overflow (1: +15.6dB)
[00:00:00.288] W7: Downmix overflow (0: +17.7dB)
[00:00:00.293] W7: Downmix overflow (1: +18.2dB)
[00:00:00.298] W7: Downmix overflow (0: +16.5dB)
[00:00:00.304] W7: Downmix overflow (1: +19.8dB)
[00:00:00.309] W7: Downmix overflow (0: +16.1dB)
[00:00:00.314] W7: Downmix overflow (1: +15.6dB)
[00:00:00.320] W7: Downmix overflow (0: +17.7dB)
[00:00:00.325] W7: Downmix overflow (1: +18.2dB)
[00:00:00.330] W7: Downmix overflow (0: +16.5dB)
[00:00:00.336] W7: Downmix overflow (1: +19.8dB)
[00:00:00.341] W7: Downmix overflow (0: +16.1dB)
[00:00:00.346] W7: Downmix overflow (1: +15.6dB)
[00:00:00.352] W7: Downmix overflow (0: +17.7dB)
[00:00:00.357] W7: Downmix overflow (1: +18.2dB)
[00:00:00.362] W7: Downmix overflow (0: +16.5dB)
[00:00:00.368] W7: Downmix overflow (1: +19.8dB)
[00:00:00.373] W7: Downmix overflow (0: +16.1dB)
[00:00:00.378] W7: Downmix overflow (1: +15.6dB)
[00:00:00.384] W7: Downmix overflow (0: +17.7dB)
[00:00:00.389] W7: Downmix overflow (1: +18.2dB)
[00:00:00.394] W7: Downmix overflow (0: +16.5dB)
[00:00:00.400] W7: Downmix overflow (1: +19.8dB)
[00:00:00.405] W7: Downmix overflow (0: +16.1dB)
[00:00:00.410] W7: Downmix overflow (1: +15.6dB)
[00:00:00.416] W7: Downmix overflow (0: +17.7dB)
[00:00:00.421] W7: Downmix overflow (1: +18.2dB)
[00:00:00.426] W7: Downmix overflow (0: +16.5dB)
[00:00:00.432] W7: Downmix overflow (1: +19.8dB)
[00:00:00.437] W7: Downmix overflow (0: +16.1dB)
[00:00:00.442] W7: Downmix overflow (1: +15.6dB)
[00:00:00.448] W7: Downmix overflow (0: +17.7dB)
[00:00:00.453] W7: Downmix overflow (1: +18.2dB)
[00:00:00.458] W7: Downmix overflow (0: +16.5dB)
[00:00:00.464] W7: Downmix overflow (1: +19.8dB)
[00:00:00.469] W7: Downmix overflow (0: +16.1dB)
[00:00:00.474] W7: Downmix overflow (1: +15.6dB)
[00:00:00.480] W7: Downmix overflow (0: +17.7dB)
[00:00:00.485] W7: Downmix overflow (1: +18.2dB)
[00:00:00.490] W7: Downmix overflow (0: +16.5dB)
[00:00:00.496] W7: Downmix overflow (1: +19.8dB)
[00:00:00.501] W7: Downmix overflow (0: +16.1dB)
[00:00:00.506] W7: Downmix overflow (1: +15.6dB)
[00:00:00.512] W7: Downmix overflow (0: +17.7dB)
[00:00:00.517] W7: Downmix overflow (1: +18.2dB)
[00:00:00.522] W7: Downmix overflow (0: +16.5dB)
[00:00:00.528] W7: Downmix overflow (1: +19.8dB)
[00:00:00.533] W7: Downmix overflow (0: +16.1dB)
[00:00:00.538] W7: Downmix overflow (1: +15.6dB)
[00:00:00.544] W7: Downmix overflow (0: +17.7dB)
[00:00:00.549] W7: Downmix overflow (1: +18.2dB)
[00:00:00.554] W7: Downmix overflow (0: +16.5dB)
[00:00:00.560] W7: Downmix overflow (1: +19.8dB)
[00:00:00.565] W7: Downmix overflow (0: +16.1dB)
[00:00:00.570] W7: Downmix overflow (1: +15.6dB)
[00:00:00.576] W7: Downmix overflow (0: +17.7dB)
[00:00:00.581] W7: Downmix overflow (1: +18.2dB)
[00:00:00.586] W7: Downmix overflow (0: +16.5dB)
[00:00:00.592] W7: Downmix overflow (1: +19.8dB)
[00:00:00.597] W7: Downmix overflow (0: +16.1dB)
[00:00:00.602] W7: Downmix overflow (1: +15.6dB)
[00:00:00.608] W7: Downmix overflow (0: +17.7dB)
[00:00:00.613] W7: Downmix overflow (1: +18.2dB)
[00:00:00.618] W7: Downmix overflow (0: +16.5dB)
[00:00:00.624] W7: Downmix overflow (1: +19.8dB)
[00:00:00.629] W7: Downmix overflow (0: +16.1dB)
[00:00:00.634] W7: Downmix overflow (1: +15.6dB)
[00:00:00.640] W7: Downmix overflow (0: +17.7dB)
[00:00:00.645] W7: Downmix overflow (1: +18.2dB)
[00:00:00.650] W7: Downmix overflow (0: +16.5dB)
[00:00:00.656] W7: Downmix overflow (1: +19.8dB)
[00:00:00.661] W7: Downmix overflow (0: +16.1dB)
[00:00:00.666] W7: Downmix overflow (1: +15.6dB)
[00:00:00.672] W7: Downmix overflow (0: +22.7dB)
[00:38:56.640] W7: Downmix overflow (0: +12.2dB)
[00:38:56.645] W7: Downmix overflow (1: +18.2dB)
[00:38:56.650] W7: Downmix overflow (0: +16.5dB)
[00:38:56.656] W7: Downmix overflow (1: +19.8dB)
[00:38:56.661] W7: Downmix overflow (0: +16.1dB)
[00:38:56.666] W7: Downmix overflow (1: +15.6dB)
[00:38:56.672] W7: Downmix overflow (0: +17.7dB)
[00:38:56.677] W7: Downmix overflow (1: +18.2dB)
[00:38:56.682] W7: Downmix overflow (0: +16.5dB)
[00:38:56.688] W7: Downmix overflow (1: +19.8dB)
[00:38:56.693] W7: Downmix overflow (0: +16.1dB)
[00:38:56.698] W7: Downmix overflow (1: +15.6dB)
[00:38:56.704] +------ STATS -----
[00:38:56.704] | Decoded frames: 73022
[00:38:56.704] | Peak signal level: +22.7dB
[00:38:56.704] | Ch0: +22.7dB - 22632 overflows
[00:38:56.704] | Ch1: +19.8dB - 21807 overflows
[00:38:56.704] +------------------
[00:00:00.000] +------ SETTINGS -----
[00:00:00.000] | Input channel configuration:
[00:00:00.000] | Left : None compression, +0dB gain
[00:00:00.000] | Center : None compression, +0dB gain
[00:00:00.000] | Right : None compression, +0dB gain
[00:00:00.000] | Sur Left : None compression, +0dB gain
[00:00:00.000] | Sur Right: None compression, +0dB gain
[00:00:00.000] | LFE : None compression, +0dB gain
[00:00:00.000] | Output configuration: 2/0
[00:00:00.000] | Ch0 [Left ]: Normal compression, -22.7dB gain
[00:00:00.000] | Ch1 [Right ]: Normal compression, -22.7dB gain
[00:00:00.000] | Output Dual mono mode: Stereo
[00:00:00.000] | Output Stereo mode: Dolby Pro Logic II
[00:00:00.000] | LFE levels: To LR -3.0dB, To LFE -INF
[00:00:00.000] | Center mix level: BSI
[00:00:00.000] | Surround mix level: BSI
[00:00:00.000] | Dialog normalization: No
[00:00:00.000] | Rear channels filtering: No
[00:00:00.000] +---------------------
[00:00:00.000] +------ BSI -----
[00:00:00.000] | Bitrate: 448 kbit (48 kHz)
[00:00:00.000] | Mode: Complete Main (CM)
[00:00:00.000] | Audio mode: 3/2 L,C,R,SL,SR+LFE
[00:00:00.000] | Center mix level: -6.0dB
[00:00:00.000] | Surround mix level: +0dB
[00:00:00.000] | Dialogue level: -27dB
[00:00:00.000] | Stream: Copyright protected, Original stream
[00:00:00.000] +----------------
[00:38:56.704] +------ STATS -----
[00:38:56.704] | Decoded frames: 73022
[00:38:56.704] | Peak signal level: +0dB
[00:38:56.704] | Ch0: +0dB
[00:38:56.704] | Ch1: -2.8dB
[00:38:56.704] +------------------

as you can see. Domething with A LOT of volume seems to be there in the start and the end according to aizd.

Playing back the PCM .wav gives offcouse a very low volume due to the volume adjustments. but also the file has a noise in the start and end that mpc didn't produce when playing the ac3 file.

Is there a way to fix this. or to replace the firts and last couples of frames with "empty" ones?

Gew

14th February 2012, 21:06

I can confirm this issue. However, it seems to be an issue with only a small number of AC3's. I've processed plenty, and this is the first where the issue is found.

X:\MYDVD>azid.exe AudioFile_81.ac3 audio.wav
Azid AC3 Decoder 1.9 (build 922)
Copyright (C) 1997-2003 By Midas <midas@egon.gyaloglo.hu>

[00:00:00.000] +------------------------------+
[00:00:00.000] | |
[00:00:00.000] | AC-3 DECODER CORE |
[00:00:00.000] | v1.9 (b922) |
[00:00:00.000] | |
[00:00:00.000] | (C) 1997-2003 By Midas |
[00:00:00.000] | <midas@egon.gyaloglo.hu> |
[00:00:00.000] +------------------------------+
[00:00:00.000] +------ SETTINGS -----
[00:00:00.000] | Input channel configuration:
[00:00:00.000] | Left : None compression, +0dB gain
[00:00:00.000] | Center : None compression, +0dB gain
[00:00:00.000] | Right : None compression, +0dB gain
[00:00:00.000] | Sur Left : None compression, +0dB gain
[00:00:00.000] | Sur Right: None compression, +0dB gain
[00:00:00.000] | LFE : None compression, +0dB gain
[00:00:00.000] | Output configuration: 2/0
[00:00:00.000] | Ch0 [Left ]: Normal compression, +0dB gain
[00:00:00.000] | Ch1 [Right ]: Normal compression, +0dB gain
[00:00:00.000] | Output Dual mono mode: Stereo
[00:00:00.000] | Output Stereo mode: Dolby Pro Logic
[00:00:00.000] | LFE levels: To LR -3.0dB, To LFE -INF
[00:00:00.000] | Center mix level: BSI
[00:00:00.000] | Surround mix level: BSI
[00:00:00.000] | Dialog normalization: No
[00:00:00.000] | Rear channels filtering: No
[00:00:00.000] +---------------------
[00:00:00.000] +------ BSI -----
[00:00:00.000] | Bitrate: 192 kbit (48 kHz)
[00:00:00.000] | Mode: Complete Main (CM)
[00:00:00.000] | Audio mode: 2/0 L,R
[00:00:00.000] | Surround mode: Unknown
[00:00:00.000] | Dialogue level: -27dB
[00:00:00.000] | Mixlevel: 105dB SPL
[00:00:00.000] | Roomtype: Small root, flat monitor
[00:00:00.000] | Stream: Copyright protected, Original stream
[00:00:00.000] +----------------
[00:00:00.000] W7: Downmix overflow (1: +21.2dB)
[00:00:00.005] W7: Downmix overflow (0: +22.7dB)
[00:00:00.010] W7: Downmix overflow (1: +23.8dB)
[00:00:00.016] W7: Downmix overflow (1: +22.6dB)
[00:00:00.021] W7: Downmix overflow (1: +23.6dB)
[00:00:00.026] W7: Downmix overflow (0: +22.8dB)
[00:00:00.032] W7: Downmix overflow (1: +28.8dB)
[01:14:34.880] W7: Downmix overflow (1: +21.2dB)
[01:14:34.885] W7: Downmix overflow (0: +22.7dB)
[01:14:34.890] W7: Downmix overflow (1: +23.8dB)
[01:14:34.896] W7: Downmix overflow (1: +22.6dB)
[01:14:34.901] W7: Downmix overflow (1: +23.6dB)
[01:14:34.906] W7: Downmix overflow (0: +22.8dB)
[01:14:34.912] +------ STATS -----
[01:14:34.912] | Decoded frames: 139841
[01:14:34.912] | Peak signal level: +28.8dB
[01:14:34.912] | Ch0: +26.2dB - 2597 overflows
[01:14:34.912] | Ch1: +28.8dB - 2574 overflows
[01:14:34.912] +------------------

Here's a sample from the very beginning of my file.

http://www.qfpost.com/download.do?get=9b05b7dbe96495b7a25729af683dd85a

I tried run the same AC3 through a simple "eac3to.exe audiofile_81.ac3 audio.wav". Works a charm, no artifacts introduced. Has anyone got a clue what this is coming from with Azid? Known issue? I'd be thankful for threads and reference. Oh, I hope you guys don't consider it "thread necromancy" to bump this thread after almost six years. It just felt like the right thing to do, instead of posting a new thread.

Cheers!