c2ff2e8b17
Simplify-pass follow-up on the #68157 salvage (regression-neutral \u2014 the old temp-file version was equally bare): capture ffmpeg's -loglevel error output so a CalledProcessError carries the real message, and log it at the voice-input catch site. Parity with transcription_tools' ffmpeg call sites. Live-verified: forced ffmpeg failure produces the captured message in the exception.