10. A computer-implemented method for processing narration audio data, the computer-implemented method comprising: as implemented by one or more computing devices configured with specific executable instructions, causing display of at least a portion of transcript text comprising words to be narrated by a user; receiving initial narration audio data comprising words of the displayed transcript text narrated by the user; storing the received initial narration audio data in an audio data file; aligning each word of the initial narration audio data with the corresponding word of the transcript text; receiving an indication of a portion of the transcript text to be re-recorded based at least in part on a selection by the user of one or more words within a displayed portion of the transcript text, wherein the selected one or more words indicate the portion of the transcript text to be re-recorded; receiving replacement narration audio data corresponding to the portion of the transcript text to be re-recorded; and incorporating the replacement narration audio data into the audio data file, such that the audio data file comprises (a) at least a portion of the initial narration audio data before the one or more words, (b) the replacement narration audio data corresponding to the one or more words, and (c) at least a portion of the initial narration audio data after the one or more words.
12. The computer-implemented method of claim 10 , wherein aligning each word of the initial narration audio data with the corresponding word of the transcript text comprises determining a starting byte in the initial narration audio data of the corresponding word of the transcript text.