On 12/29/2020 03:41 AM, Paul B Mahol wrote:
On Tue, Dec 29, 2020 at 5:51 AM Mark Filipak (ffmpeg) <markfili...@bog.us>
wrote:
I seek a way to do simple bob (i.e. repeat fields at 2xFPS) with no other
filtering. Can you help me?
I suppose I could do something like this:
-filter_complex
"split[s1][s2],[s1]separatefields[A1][a1],[s2]separatefields[A2][a2],[A1][A2]weave[Ao],[a1][a2]weave[ao],[Ao][ao]merge"
(Kindly forgive any mistakes -- I haven't done anything like this in a
couple of months.)
But I thought I'd ask here for an easier way.
These gave pretty good results. They're listed from best to worst:
bwdif
yadif=send_field_nospatial
yadif=send_field
However, I suspect that, in addition to mechanical frame changes, they're
also making some
(unwanted) cosmetic changes.
Based on what's written in the documention, these seemed promising:
separatefields,doubleweave
separatefields,tinterlace=mergex2
But they produced surprising and undesired results.
Optional Reading:
I also tried this:
separatefields,select=eq(mod(n,4),0)+eq(mod(n,4),3),weave
It's not what I actually want, but I tried it because it doesn't make
sense to me -- weave together
fields N%4==0 and N%4==3? (Really? Modulo-4? fields 0 & 3?) -- so, because
it doesn't make sense to
me, I thought I might learn something interesting. So, what happened?
"Conversion failed!" is what
happened. Why it's cited as an example (
https://ffmpeg.org/ffmpeg-filters.html#Examples-121) in the
documentation is a mystery to me.
After so much time you still struggle a lot, buy some GUI tools and be
happy ever after.
You're not helping, Paul.
You probably missing \ to escape every , inside expressions.
I'm running in Windows.
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