Linux
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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I think AVC1 is another word for H.264. That's the oldest one with lots of hardware acceleration available in old devices and by far the biggest one in file size. VP9 should roughly be on a similar level with H.265. The main difference is that VP9 is supposed to be royalty-free and H.265 isn't. The best one is of course AV1. But that also takes considerably more resources to encode and decode.
M4A and webm both aren't audio codecs. They're file container formats. I believe m4a takes AAC audio. And webm is a more general container format and it takes video as well. I think audio will be either Vorbis or Opus. And Opus is fairly good, especially at low bitrates. There probably isn't a big difference to AAC, though.
Vorbis is deprecated in favour of Opus, which is the direct replacement and exceeds it in every metric.
Opus is awesome.