Re: Recovering playback state of multiple playlists and over multiple sessions

[Yuchen Pei]

Mike Kazantsev <mk.frag...@gmail.com> writes:

On Thu, 14 Oct 2021 17:12:50 -0400
Yoni Rabkin <y...@rabkins.net> wrote:

Yuchen Pei <h...@ypei.me> writes:

> Yoni Rabkin <y...@rabkins.net> writes:

>> often. I

>> working

> Thanks for the pointer.
>

course.

> >> `emms-bookmarks' has code to support this, but it isn't >> extensively >> developed because this is an edge case and doesn't come up >> very >> have used `emms-bookmarks' in the (far) past and I remember >> it >> well enough at the time. > > As I understand it emms-bookmarks's goal is to restore the > playback > position in a media file, but not to restore to the item in a > playlist > across emacs sessions (my second problem). I tried > emms-bookmark-add > on an item, switched to another playlist and played something > there, > and came back to the item, and did emms-bookmark-next. It > didn't > restore the position. I'll have to look more into it. The bookmark data is stored natively as part of the track, so it would be written to disk in a emms-playlist-save, and equally read back of

something like that.


starting playback/bookmark-restore:

  (setq emms-player-mpv-debug t)

And then check *Messages* buffer to see whether:

 - "seek" command is being sent to mpv at all.
 - Whether it precedes {"event": "playback-restart"} there.

If mpv player is used, I'd also suspect that immediately restoring position might not work due to race with async playback start - e.g. "seek" command being sent before playback actually starts in mpv or Don't think I've tested restoring bookmarks myself, but if it doesn't look like tagging issue of some kind, maybe try doing this before

Here's when I paused the track first:

It does precede playback-restart. I tried using emms-bookmark-next when the track is playing or paused. Both times it sends the seek request and skip to the end of the track.

emms-player-mpv 441.3 json >> {"command":["set","pause","yes"],"request_id":648} emms-player-mpv 441.3 json << {"data":null,"request_id":648,"error":"success"}

emms-player-mpv 441.3 json << {"event":"pause"} [2 times]

test

emms-player-mpv 444.6 json << {"event":"seek"}
emms-player-mpv 444.6 json << {"event":"metadata-update"}
emms-player-mpv 446.3 json << {"event":"playback-restart"}

emms-player-mpv 444.5 json >> {"command":["seek",38214,"absolute"],"request_id":649} emms-player-mpv 444.6 json << {"data":null,"request_id":649,"error":"success"} emms-player-mpv 446.3 json >> {"command":["get_property","stream-end"],"request_id":650} emms-player-mpv 446.4 json << {"data":104699160,"request_id":650,"error":"success"} emms-player-mpv 446.4 json >> {"command":["get_property","duration"],"request_id":651} emms-player-mpv 446.4 json << {"data":2729.433333,"request_id":651,"error":"success"}

Here's when I started playing the track first:

emms-player-mpv 42.4 json << {"event":"playback-restart"}

test

emms-player-mpv 51.7 json << {"event":"seek"}
emms-player-mpv 51.7 json << {"event":"metadata-update"}
emms-player-mpv 53.5 json << {"event":"playback-restart"}

emms-player-mpv 53.6 json << {"event":"audio-reconfig"}
emms-player-mpv 53.6 json << {"event":"video-reconfig"}

emms-player-mpv 53.8 json << {"event":"tracks-changed"}

emms-player-mpv 42.5 json >> {"command":["get_property","stream-end"],"request_id":635} emms-player-mpv 42.5 json << {"data":104699160,"request_id":635,"error":"success"} emms-player-mpv 42.5 json >> {"command":["get_property","duration"],"request_id":636} emms-player-mpv 42.5 json << {"data":2729.433333,"request_id":636,"error":"success"} emms-player-mpv 51.6 json >> {"command":["seek",38214,"absolute"],"request_id":637} emms-player-mpv 51.7 json << {"data":null,"request_id":637,"error":"success"} emms-player-mpv 53.5 json >> {"command":["get_property","stream-end"],"request_id":638} emms-player-mpv 53.7 json << {"request_id":638,"error":"property unavailable"} emms-player-mpv 53.8 json << {"event":"end-file","reason":"eof","playlist_entry_id":70}

--
Best,
Yuchen

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