1. A device, comprising: a memory to store instructions; and a processor coupled to the memory, wherein responsive to executing the instructions, the processor performs operations comprising: detecting an occurrence of a textual phrase in closed captioning data of video media content as a detected occurrence; obtaining an audio segment corresponding to the textual phrase as a selected audio segment; computing a phonetic transcription for the selected audio segment as a computed transcription; selecting, from a speech recognition library, one or more identified phonetic transcriptions associated with the textual phrase, wherein the speech recognition library comprises audio pronunciation data for the textual phrase and identified phonetic transcriptions of the textual phrase; comparing the computed transcription with the one or more identified phonetic transcriptions from the speech recognition library; determining if the computed transcription differs from the one or more identified phonetic transcriptions from the speech recognition library; and responsive to determining that the computed transcription differs from the one or more identified phonetic transcriptions, adding the computed transcription and the textual phrase to the audio pronunciation data in the speech recognition library.