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Vance IngallsandClaude Opus 5
58cea07547
The float fixtures beside this are hand-built canonical 44-byte headers. ffmpeg's pcm_f32le writes an 18-byte `fmt ` chunk plus a `fact` chunk, putting `data` at offset 92 — so every float assertion here would still have passed if the parser could not read a real sub-mix at all. An unreadable file returns false, which the caller reads as "no automation here" and drops the group's envelope silently. Verified empirically first: the tag is 3 (WAVE_FORMAT_IEEE_FLOAT), not 0xFFFE EXTENSIBLE, and the data offset lands 4-aligned. The parser was already right; nothing here was covering it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>