[FFmpeg-user] simple bob -- How?

[Paul B Mahol]

On Tue, Dec 29, 2020 at 9:56 AM Mark Filipak (ffmpeg) <markfilipak at bog.us>
wrote:

> On 12/29/2020 03:41 AM, Paul B Mahol wrote:
> > On Tue, Dec 29, 2020 at 5:51 AM Mark Filipak (ffmpeg) <
> markfilipak at 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.
>

I'm helping you so you can help yourself.


>
> > You probably missing \ to escape every , inside expressions.
>
> I'm running in Windows.
>

That is not important. Either escape ',' inside expressions or do not ask
for help if you gonna ignore help.


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