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pix_video flickers also with pix_separator buffer inbetween #176

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musger opened this Issue Nov 24, 2017 · 6 comments

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musger commented Nov 24, 2017

pix_video does flicker on at least OS X and Linux also when the camera's frame rate is decoupled from Gem's frame rate by inserting a pix_separator after pix_video.

@umlaeute

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umlaeute commented Nov 25, 2017

i thought the issue was related to some processing [pix_...] objects in the chain.

this bug-report makes it sound as if a simple [gemhead]->[pix_video]->[pix_texture]->[square] chain would flicker.

please clarify.

@musger

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musger commented Nov 25, 2017

Thank you! This bug describes flicker when there is a simple
[gemhead] -> [pix_video] -> [pix_texture] -> [square]
chain on OS X. It also flickers when there is a pix_separator inserted to buffer images as in
[gemhead] -> [pix_video] -> [pix_separator] -> [pix_texture] -> [square].

The other bug, which I asked about on pd-list, is about [pix_invert] changing its state seeminly randomly when being feeded a video file or video camara feed without initializing its initial state explicitely. You asked if it would be a dup of https://sourceforge.net/p/pd-gem/bugs/33/ which made me try [pix_separator] in this #176 bug. However, the flickering [pix_invert] is not yet reported as separate bug as it is not yet clear to me if its related to https://sourceforge.net/p/pd-gem/bugs/61/ as well. I also remember [pix_flip] flickering (changing its state) with a [pix_video] source on OS X. Thanks!

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umlaeute commented Dec 5, 2017

what exactly do you mean with the following?

the camera's frame rate is decoupled from Gem's frame rate

does this simply indicate that you've inserted a [pix_separator]? or that the camera runs at a different speed from Gem? or that you are banging the gemchain with a [metro] out of sync with the framerate?

@umlaeute umlaeute added bug enhancement and removed enhancement labels Dec 5, 2017

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musger commented Dec 5, 2017

The camera's frame rate was different from Gem's framerate. I inserted a [pix_separator] because I understood that it could help buffering images and hence decoupling the camera's and Gem's framerate. I might be mistaken. I was not banging the gemchain with a metro.

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umlaeute commented Dec 5, 2017

thx.
could you be more specific about the actual framerates of camera and Gem?

@musger

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musger commented Dec 5, 2017

From my memory I think the camera ran at 15fps, and Gem was at its default 20fps. Inserting the mentioned [pix_separator] and changing Gem to 15fps caused less flicker, but did not make it go away.

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