piwall2 out of sync startups.txt

Data from 2021-08-28 (4 TVs in the tv wall):

    "lcd soundsystem - home" out of sync startups w/ parallel ytdl (no sleeps)
        set 1:
        6/20

        set 2:
        2/20

        set 3:
        3/20

        set 4:
        1/20

        set 5:
        5/20

    "lcd soundsystem - home" out of sync startups w/ parallel ytdl and delay_buffer 2s
        set 1:
        1/20

        set 2:
        0/20

        set 3:
        0/20

    "lcd soundsystem - home" out of sync startups w/ parallel ytdl, no delay_buffer, but sleep 2s between opening the two procs:
        set 1:
        1/20

        set 2:
        0/20

        set 3:
        0/20

        set 4:
        0/20

Data from 2021-11-07 (10 TVs in the tv wall):

    "lcd soundsystem - home" out of sync startups w/ 2s sleep:
        3/60 times out of sync

    "lcd soundsystem - home" out of sync startups w/ 1s sleep:
        7/30 times out of sync

    "lcd soundsystem - home" out of sync startups w/o sleep:
        6/11 times out of sync

UPDATE 2021-11-10
* even after changing the synchronized playback mechanism to use a dbus unpause signal, it seems we still 
  cannot get rid of the sleep here
* and still, lowering the sleep from 2s -> 1s results in a higher out of sync start up rate.

Data from 2021-11-22 (10 TVs in the tv wall) (this is after we had changed to dbus unpause signal a while ago):

    "lcd soundsystem - home" out of sync startups:
        1/60 times out of sync