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https://github.com/relt-1/czeditor Here is the source code. Its definitely possible to avoid lag with PIL. In fact, its real and its now!
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Nutrient
Nutrient – The #1 PDF SDK Library, trusted by 10K+ developers. Other PDF SDKs promise a lot - then break. Laggy scrolling, poor mobile UX, tons of bugs, and lack of support cost you endless frustrations. Nutrient’s SDK handles billion-page workloads - so you don’t have to debug PDFs. Used by ~1 billion end users in more than 150 different countries.
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Nice, I was looking for an open-source/free video editor recently to literally just place 100+ clips in a row on a timeline and mute some of them, and it was a real struggle to find something that worked and didn't have major breaking bugs even for a usecase that simple. Ended up using moviepy and literally just writing a for loop that iterated over a folder with clips in it and stitched them together.
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openshot-qt
OpenShot Video Editor is an award-winning free and open-source video editor for Linux, Mac, and Windows, and is dedicated to delivering high quality video editing and animation solutions to the world.
Check out Openshot (https://www.openshot.org/) — free, written in Python. So it’s definitely doable. Not sure if usin PIL is the way to go if you want to avoid lag, though.
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Are you aware of Vapoursynth? https://www.vapoursynth.com/
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WindowCreator
WindowCreator is a python script which can generate realistic and accurate message boxes and windows from many operating systems. It is made to replace atom smasher and to help cre creators make videos
This is so hilariously niche but a very cool project, looking forward to seeing it come along. It looks you had already built a decent amount of the code base up in this previous repo meant to generate error popups for many OS's?
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take a look at https://github.com/kkroening/ffmpeg-python