Store and project any set of movies, ultimately in CL

[davidt0x]

Store and project any set of movies, ultimately in CL. This was in Megan's original email specifying open issues but I am unsure about the details. Any comments on this @r-shruthi11

[nzjrs]

If 'any set of movies' is synonymous with any video stimulus without having to put it in the playlist then this is already there BUT, as much as I am luke warm about the playlist concept, it does provide the necessary opportunity for the backend psychopy code to setup and construct the visual stimuli (and psychopy setup is slow). If you lazily construct a video plalist item (a movie?) then you will pay the delay cost.

That said,

fly-vr/flyvr/control/experiment.py

Line 167 in 5dac72a

def play_backend_item(self, backend, **conf):

Experiment.play_backend_item should let you send any video playlist item stanza without having it in the playlist ahead of time - however the video server will take however long it takes to init this

fly-vr/flyvr/video/video_server.py

Line 1142 in 5dac72a

stim = stimulus_factory(defn['name'], **defn.get('configuration', {}))

before showing it which adds latency. I always favoured the tradeoff of preconfiguring the playlist items to save the latency switch.

Wrt. CL - Experiment.item_mutate

fly-vr/flyvr/control/experiment.py

Line 175 in 5dac72a

def item_mutate(self, backend, identifier, attribute, value):

lets you change the attribute of a backend playlist item attribute, to do CL manipulation of any attribute in a video playlist item

fly-vr/flyvr/video/video_server.py

Line 1149 in 5dac72a

q.put(elem['video_mutate'])

and

fly-vr/flyvr/video/video_server.py

Line 1022 in 5dac72a

setattr(_stim.p, _attr, _value)

(from memory)

[nzjrs]

this was a video CL example https://github.com/murthylab/fly-vr/blob/master/experiments/cl_fixation.py