There are several reasons why an audio transcription could be missing:
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Unavailable for real-time bidding (RTB) creatives: Audio transcriptions are not provided for RTB creatives.
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Missing or undetectable language code: The system could not detect the language code, or it was not included in the creative's metadata.
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Failed video transcription: If the system encountered an error while attempting to transcribe the video creative, the transcription will be unavailable.
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Video creative lacks transcribable audio: The video creative may not contain audio suitable for transcription, such as silent videos or those with only background music.