Thumbnail & preview for video and audio files

[MrOrz]

Current media variant settings: https://github.com/cofacts/rumors-api/blob/4b00d586e44cb6aa15c858e9c945b8ea4c67d3bc/src/graphql/mutations/CreateMediaArticle.js#L61-L82

• Current logic only generates variants for images
• We need to modify the logic to handle video and hopefully audio
• Need to determine a size for thumbnail (website & LINE bot list page) & preview (website detail before login)
• ffmpeg is already included, so just use it :)

[MrOrz]

ffmpeg is quite CPU intensive. New proposal is to use Transcoding API + Google cloud function that listens on GCS change.

• Detail: https://g0v.hackmd.io/aJqHn8f5QGuBDLSMH_EinA#Video-summarization-for-thumbnails
• Initial Proposal: https://g0v.hackmd.io/@cofacts/meetings/%2FucUXvnqbRBmsD6YGkmdYvg