In message , Paul
writes:
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It's the "cutting out frames" case which can be done without
re-encoding. You have to cut on GOP boundaries to make it work.

And at least one video standard,

Do you know which one?

there's a software that
allows cutting any frame, and just the current GOP needs
to be re-worked to meld the ends properly.

Which software - or is it (your beloved) FFMPEG as you describe below?

You can use FFMPEG to join videos on GOP boundaries.
I've done that with Cinepak encoded content. Being
careful to make each segment a multiple of the GOP
size. (I.e. a 12 frame GOP, a 12000 frame segment,
so one movie chunk has 1000 GOPs in it.)

https://en.wikipedia.org/wiki/Group_of_pictures
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The largest GOP value is around 600 frames. And that's
(Wow, 20 seconds for NTSC!)
not a popular value to try either. Using that is for
bar bets (ugliest, least responsive video).
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I've looked at the Wikipedia article (after at first reading about the
Grand Old Party! [Which I was fascinated to read was originally
liberal!!]), and it gives the impression that the GOP size is generally
fixed; that surprised me - I'd always assumed they varied with content
(e. g. a scene cut requiring a new I frame, a static picture not needing
any after the first).
--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

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