The first is a pseudo-bug I guess -- perhaps this will only document
the behaviour a bit.
The setup:
Movie Loader with a valid movie path that includes audio -- set to
async so that the audio plays.
Math expression patch -- the expression should be a > b. Attach
"Movie Position" to "a" , and "Movie Duration" to "b" (note: this
will always evaluate to false, since the position cannot be past the
end of the movie as far as I know... maybe streaming movies will be
different? Not important).
Billboard -- attach Movie Loader's image output to the billboard's
image input, and the Math Expression patch's output to the Enable input.
Graphically, this will do nothing: the billboard is disabled (via the
expression patch), so it doesn't render anything. This is correct.
However, the audio still plays. This is because the movie loader
patch is "activated" and gets evaluated to see if the condition
changes (to drive the enable input of a consumer patch). The audio is
generated because instead of having a red patch generate output, the
Movie Loader generates it when it's "enabled" and evaluated each
frame. Disconnecting the enable input of the billboard causes
"correct" behaviour (audio stops).
I'm not sure of the feasibility of correcting this; it *might* run
into Halting Problem-esq issues graph-evaluation-wise. QC's also not
designed to make solving this easy from a patch point of view (other
green patches/plugins that generate output may run into this problem
if they generate output independent of a consumer).
Also, setting the "Loop Duration" to less than about 0.01 seems to
make QC hang when "Loop Start" is non-zero. This is probably a
legitimate bug that could get a bug report, but perhaps someone on the
list can confirm this first. (Same setup as above, set loop duration
to something small but non-zero, and then change loop start --
beachball forever?)
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