6d280360e3
ADV.wmv carries ONE audio stream and it is wmapro 5.1, not XMA. Any framing of the intro's audio as only 'which of three voice streams to ship' was missing the bed. Aligned the 148 s capture against that track (envelope r 0.769 against a median of -0.001, refined to +224 samples, r 0.900) and solved capture = g x movie + residual per channel. The gain is 0.600 on every channel -- a uniform -4.44 dB, a mixer setting rather than a fit artefact. LFE reproduces to -115.73 dBFS, 72 dB down, which is what rules out codec difference as the explanation for the other residuals. FC is the exception: the movie explains NOTHING of it (-0.09 dB), and the movie's own FC is 91.6 % silent. The residual is three signals, not one: a front pair (r 0.918), a rear pair (r 0.929), and a centre whose partner LFE is empty. The FC residual spans 34 dB across 100 ms frames -- bursty, not steady noise. That CONFIRMS the corpus's 5.1 reading, which voice-three-streams-are-concurrent recorded as not established, and it confirms the specific detail it offered: that the mono-in-stereo stream is 'a centre paired with a silent LFE'. Measured from the output with no access to the stream contents. Also corrects my own census page: it labelled channels with the ALSA permutation [0,1,4,5,2,3] from the recipe page, which does NOT apply to this capture. The 6x6 matrix was computed assuming no order, every row's max falls on a distinct movie channel, and the answer is the identity -- so the census's 'BR is 82 % silent' was really LFE, reconciling with the movie's own 80.64 % silent LFE. Reach: one boot, one movie; which XMA context is front/centre/rear is not determined, only that the residual occupies those positions; and whether 0.600 is a fixed constant or a volume setting is unknown. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
43 lines
2.2 KiB
Plaintext
43 lines
2.2 KiB
Plaintext
# What the game emits over the boot intro, decomposed against the movie's own track.
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#
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# 2026-08-30. Capture: docs/re/structures/intro-audio-output-census.md
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# Reference: ffmpeg -i /disc/dat/movie/ADV.wmv -map 0:a:0 -f f32le -ar 48000 -ac 6
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#
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# ADV.wmv carries ONE audio stream: wmapro, 48000 Hz, 5.1, 384 kb/s. Not XMA.
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#
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# ALIGNMENT (energy envelope, 100 Hz, summed over channels = permutation-invariant)
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# movie begins +6.63 s into the capture; envelope r = 0.7692
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# control: peak 0.7692, 99.9th pct 0.6241, median -0.0009
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# refined by sample-level correlation to +224 samples, r = 0.900
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#
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# CHANNEL MAP -- measured, not assumed. Every row's max is a distinct movie
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# channel, i.e. a genuine permutation, and it is the IDENTITY:
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# cap ch0->FL +0.899 ch1->FR +0.935 ch2->FC +0.185
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# cap ch3->LFE +1.000 ch4->BL +0.960 ch5->BR +0.971
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# 🔴 The ALSA order [0,1,4,5,2,3] documented in audio-capture-alsa-file-tee.md
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# does NOT apply to this capture. See the doc for what that corrected.
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#
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# DECOMPOSITION capture = 0.600 x movie + residual (80 s from movie t=20 s)
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# ch gain r cap rms resid rms resid/cap
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# FL 0.600 +0.905 -21.86 -29.28 -7.43 dB
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# FR 0.600 +0.935 -20.28 -29.29 -9.02 dB
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# FC 0.597 +0.146 -25.18 -25.27 -0.09 dB <- movie explains NOTHING
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# LFE 0.600 +1.000 -43.66 -115.73 -72.06 dB <- exact to precision
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# BL 0.600 +0.956 -24.89 -35.46 -10.58 dB
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# BR 0.600 +0.964 -24.02 -35.49 -11.47 dB
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#
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# RESIDUAL STRUCTURE -- residual vs residual correlation
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# FL FR FC LFE BL BR
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# FL +1.000 +0.918 +0.017 +0.001 +0.009 +0.004
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# FR +0.918 +1.000 +0.034 +0.001 +0.015 +0.014
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# FC +0.017 +0.034 +1.000 +0.000 +0.385 +0.378
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# LFE +0.001 +0.001 +0.000 +1.000 +0.000 -0.000
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# BL +0.009 +0.015 +0.385 +0.000 +1.000 +0.929
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# BR +0.004 +0.014 +0.378 -0.000 +0.929 +1.000
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#
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# Three coherent groups: a FRONT pair (0.918), a REAR pair (0.929), and a
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# CENTRE whose partner LFE is empty. That is three stereo streams in 5.1.
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#
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# FC residual 100 ms frame levels: median -53.9 dB, p90 -19.9 dB,
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# dynamic range 34.0 dB -- bursty, not steady noise.
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