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cf7f9573a2
The parakeet-specific word accessors can return stale initialisation data (model name, binary blobs) for segments with no real speech. Add isValidWord() to filter out words that have: - empty or whitespace-only text - U+FFFD replacement characters (from binary data scrubbing) - negative timestamps - zero duration (end <= start) Also skip empty segments entirely when they have no recognisable content (empty text AND no valid words), preventing spurious subtitle entries like '00:45:33,592 --> 00:45:33,592 parakeet@rH\u000b\ufffdI'. Applies to both AudioTranscription and AudioTranscriptionStream. Signed-off-by: fqscfqj <fqscfqj@outlook.com>