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The corpus said 0.14 s is "far too short for the spoken line". That is a judgement about audio, and audio judgements cannot be made in this container. The subtitle tracks settle it without listening: each carries cue START times, and a subtitle that appears at t seconds cannot sit inside a clip shorter than t. FFmpeg-measured (not estimated from a compression ratio -- the first version of this example used an 8:1 guess, which is not good enough to hang a conclusion on): hokyu_LS_s02A D_450 cue 4.00 s audio 1.41 s MISSING hokyu_LS_s09A D_451 cue 3.70 s audio 1.81 s MISSING hokyu_LS_s02H D_453 cue 4.70 s audio 0.07 s MISSING hokyu_DS_s13A D_452 cue 0.00 s audio 1.21 s no signal hokyu_DS_s07H D_454 cue 0.00 s audio 0.21 s no signal Three of five are decisive; the other two have their only cue at 0.0 s and say nothing either way. So something is genuinely missing from these banks -- established independently of the leading-region work, and measured rather than felt. The fmt-variation probe I recorded as the next step is INCONCLUSIVE and is written up as such: 36 combinations over VOICE_D_453's 22-packet leading region all produced 0 PCM bytes, including ones that should be equivalent to the crate's own synth_xma1_fmt, which does parse. So the probe tested my hand-built fmt chunk, not the hypothesis, and it is NOT evidence that the region is non-XMA. The retry should use the crate's helper. Artifact: examples/voice_len_vs_subs.rs. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PMRJjbxLqZtsb5Vb7KunPE