[FFmpeg-user] 1080i AVC-I 100 frame rate conversion

Bruce Roberts roberb04 at gmail.com
Tue Mar 30 13:46:59 EEST 2021

Hi Mark,

Thank you once again for that detailed explanation of your ingenious
solution! I think I finally understand it now (having spent a few hours
working through it) and I might also understand the leaping back behaviour:
It looks to me like your interleave filter will output the following
sequence of weighted frame index mixes: [0+0], [0+1], [0+1], [0+1], [0+1],
[1+1], [2+3], [2+3],  [2+3], [2+3], *[2+2]*, [2+3], [2+3], [2+3], [2+3],
[3+3], [4+5],  [4+5],  [4+5],  [4+5], *[4+4]*...

Is that right?

I've attached a spreadsheet that shows how I see the command behaving for
the first 35 frames.

Also, am I correct in thinking that there is a decimate stage that isn't
shown in the command you shared?

I think the fact that you're missing some of this email thread might be
because I didn't "reply all" at some point. Sorry about that. I'll happily
forward the entire thread to you personally if you like.

Best wishes,
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