22.9 azspeech transcribe video
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Consider the use case of wanting to transcribe a YouTube video for an audio impaired colleague. The video can be downloaded from YouTube using youtube-dl:
We can use youtube-dl to download the audio from a YouTube video:
youtube-dl --extract-audio --audio-format wav --output "myvid.%(ext)s" https://www.youtube.com/watch?v=AZKcl4-tcuoAlternatively we can download the video to then manually extract the audio using ffmpeg ourself, as explained in the GNU/Linux Survival Guide. In our example we explicitly ask for an mp4 rather than the default webm format. Either would do and ffmpeg will extract the audio as required.
To extract the audio from the video using ffmpeg:
It is then straightforward to transcribe the wav file, saving the output into the text version:
If the video is in Indonesian, for example, then a better result will be obtained with:
With a pipeline, the current implementation of the transcribe command will not wait for the audio to complete, and so the pipeline will not be successful.
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