[FFmpeg-user] simple bob -- How?

[Mark Filipak (ffmpeg)]

On 12/29/2020 05:09 AM, Paul B Mahol wrote:
> On Tue, Dec 29, 2020 at 11:06 AM Mark Filipak (ffmpeg) <markfilipak at bog.us>
> wrote:
> 
>> On 12/29/2020 04:28 AM, Paul B Mahol wrote:
>>> Try this:
>>>
>>> "separatefields,select=eq(mod(n\,4)\,0)+eq(mod(n\,4)\,3),weave"
>>
>> That plays at 15/1.001 FPS. The fields aren't right, either. That modulo
>> doesn't make sense to me.
>>
> 
> That INTERLACES, have you followed documentation at all?

Yes, I know it interlaces (weaves). If a top field is followed by a top-field, then when they're 
interlaced it will be a full frame, line doubled. That's half of what I want.

[A/a] -> [A][a] -> [A][A][a][a] -> [A/A][a/a]

 From your other reply, I'll try stack, but I think it makes one field above the other field, not 
interlaced. Doc: "Stack input videos vertically."