Add support for audio-only recordings
Example: https://video.ethz.ch/lectures/d-infk/2022/autumn/252-0217-00L/fc05824c-39fa-47f6-94cf-19a59f08004b.html
Currently we just skip them.
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Example: https://video.ethz.ch/lectures/d-infk/2022/autumn/252-0217-00L/fc05824c-39fa-47f6-94cf-19a59f08004b.html
Currently we just skip them.