Am 17.04.2020 um 08:02 schrieb Mark Filipak:
Thanks to pdr0 -at- shaw.ca, My quest for the (nearly perfect)
p24-to-p60 transcode has concluded.
But remaining is an ffmpeg behavior that seems (to me) to be key to
understanding ffmpeg architecture, to wit: The characteristics of
frame traversal through a filter chain.
From a prior topic:
-----
Filter graph:
split[A] select='not(eq(mod(n+1\,5)\,3))' [C]interleave
[B]split[D]select='eq(mod(n+1\,5)\,2)'[F]blend[D]
[E]select='eq(mod(n+1\,5)\,3)'[G]
What I expected/hoped:
split[A] 0 1 _ 3 4 [C]interleave 0 1 B 3 4 //5 frames
[B]split[D] _ 1 _ _ _ [F]blend[D] |
[E] _ _ 2 _ _ [G] blend of 1+2
What appears to be happening:
split[A] 0 1 _ 3 4 [C]interleave 0 1 _ 3 4 //4 frames
[B]split[D] _ _ _ _ _ [F]blend[D]
[E] _ _ 2 _ _ [G]
The behavior is as though because frame 1 (see Note) can take the
[A][C] path, it does take it & that leaves nothing left to also take
the [B][D][F] path, so blend never outputs.
Only an untested idea, what happens when you change the order of the
inputs of the blend filter, first [G] and then [F]?
Michael
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