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Thank you for your suggestions. I have enabled all the OpenGL options and now gifs work like a charm. In practice, this already solves my problem. I have also installed the ubuntu-restricted-extras, as you suggested (I don't know how I did install my codecs previously) and I restarted my pc, just in...

Sure, I am sending a customer support notice through https://www.softmaker.com/en/support/customer-support

Hello,
I have bought Presentations 2024 (rev S1206.1118, 64 bit), but unfortunately video clips are still not supported for Linux (when I try to play a video, the program crashes) and the GIF issue remains. I have sent a crash report.

Hello, I need to embed video clips in my presentation, but apparently, the Linux version of Presentations 2021 doesn't support this features, which is very inconvenient. Therefore I have resolved to using GIFs. The problem is that when in slide show mode, GIFs lag considerably, sometimes to the poin...