Basics of the Video Processor Plugin

tbrown92030 · 06-25-2020, 08:26 PM

Hello all,

I'm pretty much a total n00b to mucking about in the Video Processor code although not a n00b for programming in general. What I would like to know is just about some of the basics how the video processor plugin operates.

I'm assuming that the plugin is executed on a per-frame basis for rendering so let me know if that basic assumption is wrong!

Can a video processing preset keep state? Do changes in the parameters or variables persist through to the next time the code is executed (the next frame)?

Can the ReaScript EEL2 API functions be used inside video processor preset code, e.g. the eel_(fopen/fseek/fgets/fclose) functions? (and, per the prior question, can anything loaded from an external file be kept across all invocations (frames)?

Eliseat · 06-26-2020, 06:58 AM

The only place where you can find some (all?) of the video processor programming descriptions is there. https://mespotin.uber.space/Ultrasch...mentation.html

I wish I could understand what its all about, but its not easy for someone who only learned basic programming several times in live. But there is hope. I maybe will start programming lessons in September 2020 which will include c++ and Java. though I have no idea if this will help understanding video processor and other Reaper scripts any better.

Greetings
Eli

tbrown92030 · 06-26-2020, 08:37 AM

Thanks, yes... I've been using that site for API docs. Unfortunately, as with docs for pretty much any API, they don't give a lot of higher level explanation; just the details of each API variable or function.

I guess another way to express my questions is to ask how the preset code for the video processing plugin relates to any other, say, JSFX plugin. Those have a more definite (and documented) structure for the different "code sections."

Meo-Ada Mespotine · 06-26-2020, 03:13 PM

Into the one for video processor, I also included an introduction and some examples.
It's not a novel and I want to improve on that at some level but I hadn't time yet to do so.

And unlike JSFX, you don't have really structures. It's more

1. Get the image
2. Manipulate it to your needs
3. Blit it.

The different presets have also good examples so I suggest you to take one and alter it and see, what works and what not.

tbrown92030 · 06-26-2020, 05:10 PM

Thanks for the links... I will definitely check all that out!

06-25-2020, 08:26 PM	#1
tbrown92030 Human being with feelings Join Date: Jul 2019 Location: Los Angeles, CA USA Posts: 6	Basics of the Video Processor Plugin Hello all, I'm pretty much a total n00b to mucking about in the Video Processor code although not a n00b for programming in general. What I would like to know is just about some of the basics how the video processor plugin operates. I'm assuming that the plugin is executed on a per-frame basis for rendering so let me know if that basic assumption is wrong! Can a video processing preset keep state? Do changes in the parameters or variables persist through to the next time the code is executed (the next frame)? Can the ReaScript EEL2 API functions be used inside video processor preset code, e.g. the eel_(fopen/fseek/fgets/fclose) functions? (and, per the prior question, can anything loaded from an external file be kept across all invocations (frames)?

06-26-2020, 06:58 AM	#2
Eliseat Human being with feelings Join Date: Mar 2018 Location: Cologne Posts: 1,362	The only place where you can find some (all?) of the video processor programming descriptions is there. https://mespotin.uber.space/Ultrasch...mentation.html I wish I could understand what its all about, but its not easy for someone who only learned basic programming several times in live. But there is hope. I maybe will start programming lessons in September 2020 which will include c++ and Java. though I have no idea if this will help understanding video processor and other Reaper scripts any better. Greetings Eli __________________ ☆.。.:・°☆.。.:・°☆.。.:・°☆REAPER//✿◔‿◔)°☆.。.:・°☆.。.:*・°☆

06-26-2020, 03:13 PM	#4
Meo-Ada Mespotine Human being with feelings Join Date: May 2017 Location: Leipzig Posts: 6,630	Into the one for video processor, I also included an introduction and some examples. It's not a novel and I want to improve on that at some level but I hadn't time yet to do so. And unlike JSFX, you don't have really structures. It's more 1. Get the image 2. Manipulate it to your needs 3. Blit it. The different presets have also good examples so I suggest you to take one and alter it and see, what works and what not. __________________ Use you/she/her.Ultraschall-Api Lua Api4Reaper - Donate, if you wish On vacation for the time being...

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06-26-2020, 08:37 AM	#3
tbrown92030 Human being with feelings Join Date: Jul 2019 Location: Los Angeles, CA USA Posts: 6	Thanks, yes... I've been using that site for API docs. Unfortunately, as with docs for pretty much any API, they don't give a lot of higher level explanation; just the details of each API variable or function. I guess another way to express my questions is to ask how the preset code for the video processing plugin relates to any other, say, JSFX plugin. Those have a more definite (and documented) structure for the different "code sections."

06-26-2020, 05:10 PM	#5
tbrown92030 Human being with feelings Join Date: Jul 2019 Location: Los Angeles, CA USA Posts: 6	Thanks for the links... I will definitely check all that out!