[FFmpeg-devel] [PATCH]Mention in the documentation that fieldmatch needs cfr input

Nicholas Robbins nickrobbins at yahoo.com
Wed Oct 29 19:01:18 CET 2014

> On Wednesday, October 29, 2014 1:33 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> > Nicholas Robbins <nickrobbins-at-yahoo.com <at> ffmpeg.org> writes:
>>  Not now, but later, I would be interested in helping to 
>>  adapt decimate to do what we want. A detectfps filter 
>>  might be useful too, and would be a subset of the work.
> I believe if decimate just detects 23.9 -> 29.97 and 
> 29.97 -> 23.9 it will fix nearly all use cases.
> Carl Eugen

If it is running after fieldmatch, then it needs to detect

29.9 (w 1/5 duplicates duplicates, ouput of fieldmatch on TC material)
29.9 (w/o duplicates, interlaced or progressive, but not TC)

A bonus would be to differentiate 29.9 that was originally 23.9 (Film, TC with 3:2) or originally 24.9 (PAL, TC with 3:3:2:2:2)

If the input to -vf "fieldmatch,decimate" is mixed 30fps progressive and the result of TC then it decimate will always see 30fps frame rate, but some frames will be duplicated, or am I missing something?


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