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I had been discarding FFmpeg's stderr with Stdio::null(). It says exactly what happens: an unimplemented "Reserved bit", then a negative bit-skip -- and the failing frame index is always the last one. bank packets frames fr/packet fails at VOICE_D_450 8 45.7 5.71 44 VOICE_D_452 7 29.4 4.21 28 VOICE_D_453 22 198.9 9.04 198 VOICE_D_454 29 287.5 9.92 287 So the previous entry's "the decodes are visibly partial" is wrong, and it was mine. I read "samples per input byte ranges 2.10-4.96" as truncation; it is ordinary XMA1 variable bitrate. Only the final frame of each stream is lost. The decode is essentially complete. The sample rate still does not converge. I tried the obvious repair -- counting the whole bank, leading region plus RIFF sub-waves, since the two split the audio very differently per bank. Two banks then agreed at a tidy ~2.1x ratio pointing near 22 kHz, and the third refuted it: implied rates are 39742, 20563 and 23108 Hz. So the container is identified, the decode is essentially complete, and the duration still does not reconcile -- which moves suspicion to the other side of the comparison. movie_subtitle::track_voice_cues returns (u32, f32) and I have been reading that f32 as SECONDS on the strength of the format notes describing mm:ss.cc cue text. If it is centiseconds, a frame index or a per-page offset, every "audio missing" verdict inherits the error. Recorded as the next thing to check, and to be checked BEFORE any more audio work. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PMRJjbxLqZtsb5Vb7KunPE