It's not an ideal home for it, but I think it doesn't really belong in the 'Advanced concepts' section, being a command rather than a concept.
I've also made a few small edits to the text of the command.
I've replaced the links in the Set Stream Properties recipe with a more specific link.
Also, according to the docs, the correct flag is -color_primaries, not -color_primary.
Consistently use FFmpeg to refer to the program and ffmpeg for the command line invocation of the program.
Add another example to the 'asic structure of an FFmpeg command explanation.
Add a note on filter order to the Filtergraph explanation.
- New section at top: 'Getting started with ffmpeg'. Added basic command explanation under this heading.
- New section at bottom: 'Advanced ffmpeg concepts'. Filtergraph explanation moved there.
- Move 'Set stream properties' to the 'Change video properties' section.
- Heading change: 'Create a video' to 'Create a video from images'. (In the ToC, it's 'Create a video from image(s) and audio')
- 'View Subprogram Info' is fixed (data-target now matches the new ID).
- Consistent capitalisation
These links wrap a <button> tag and use the "btn" class. To distinguish them from the command buttons that trigger the modals, I've given them a different colour scheme and a different emoji prefix.
'View format info' seemed to me to be poorly named, what this command actually does is to give details of various libraries, muxers, encoders, etc. 'View ffmpeg subprogram info' may not itself be a totally correct nomenclature, but it's a bit closer to the practical meaning, I think.
Also: a couple of minor text changes.
