Resuming loaded the file from the start and sought on FileLoaded. By
then mpv's demuxer had begun reading ahead from the beginning, so the
blocks the seek wanted queued behind ones fetched to be thrown away.
Player::play_from sets mpv's start option instead, and puts it back
once the file has loaded.
VideoStream::warm_resume fetches, beside the two edge blocks, the block
the resume position falls in, estimated from the running time saved
with the watch state. A video's bitrate is uneven, so it can land a
block off; then it is one block for nothing, against a round trip saved
when it lands.
- a page fades in over 140 ms when the page changes, rather than cutting
- Ctrl+S in the player saves the frame, without subtitles, to
Pictures/proton-stream as "Title S01E04 12-34.png"
- right-click a library tile to play or resume it, mark it watched or
unwatched, download it, change its match, or take it off Continue
watching
- mpv's demuxer-cache-time is shaded on the seek bar, so it shows
whether a jump lands in what is already read ahead
- paused-for-cache shows a spinner over the picture and in the controls