@ozsouth / @Jasper :-
Under normal circumstances, I have no need for lightweight, bare-bones Puppies. There's so much RAM & storage to play with on this relatively new HP Pavilion desktop rig, there's no point my trying to keep things small.
With the Dell Latitude I snagged last year, of course, it's a different story. 4 GB max RAM, 120 GB SSD (+ a pair of 256 GB SanDisk flashdrives permanently plugged-in for all my media, but I don't use them for booting from; they're USB 3.2-gen drives, and won't boot through a USB 2.0 port, so storage only.
It's running Fossapup64 9.5 'standard', and Xenialpup64. TBH, I spend more time in Xenial than I do Fossa, so.....I might try this on the Latitude, just for the hell of it.
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As for ffmpeg, yeah; I do recall having issues like you mentioned with earlier versions of PaleMoon in older Puppies. I long ago realised that Puppy's 'anaemic' ffmpeg was as 'stripped-back' and 'minimal' on functionality as it could possibly be.....all in the interests of keeping it tiny.
When Will McEwan (wiak) was developing WeX a few years back, Fred was helping him out with a lot of stuff.....and found the website belonging to John Van Sickle, who provides 'statically-compiled' builds of ffmpeg. Ever since then, that's all I use; with any new Pup, I just replace the built-in ffmpeg with one of John's builds, and "Bob's yr Uncle"!
Sorted.
(Might not suit some folks, though, since some of the recent builds are getting rather large....) 
Works for me, though.
Mike. 
