Video: Extract and save poster image
In HTML5 video, there's a poster attribute on the tag, it contains
the URL to an image that should be shown initially before the
player has started.
POSTER IMAGE DIMENSIONS
Fetch from encoded video. It's available on the instantiated
VideoThumbnailer in the dst\_data after encoding the video.
EXTRACTING THE IMAGE
We should perhaps use the VideoThumbnailer. IIRC it's possible to
pass custom dimensions to it.
defect → enhancement
bitesized added; bite-sized removed