[FFmpeg-user] simple bob -- How?

[Paul B Mahol]

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 probably missing \ to escape every , inside expressions.


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