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Add metadata value for presence of audio channel in video blobs by brenogazzola...
source link: https://github.com/rails/rails/pull/42392
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Summary
When working with video files it is often useful to know if the file has an audio channel or not, since any ffmpeg command that includes a filter for audio will fail otherwise.
This PR uses information already extracted by probe_from in video_analyzer to add an boolean named audio to the metadata that is set to true is the file contains an audio channel, and false if it doesn't.
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