[FFmpeg-devel] [PATCH] avfilter: add framerate video filter
cus at passwd.hu
Sat Aug 29 19:16:42 CEST 2015
On Sat, 29 Aug 2015, Carl Eugen Hoyos wrote:
> Marton Balint <cus <at> passwd.hu> writes:
>> Consider you have a 25i source, and you want 30i (60p for display)
>> Are you referring to this filter chain for deinterleaving?
>> -vf il=l=d:c=d,framerate=30,il=l=i:c=i,yadif=1
>> And this for deinterlacing?
>> -vf yadif=1,framerate=60,interlace,yadif=1
> The original task afaiu was not to provide a progressive
> output stream (in that case, deinterlacing first is of
> course correct) but to provide an interlaced stream.
> (I don't care about the reason.)
The last filter (yadif=1) is only there to visually check the results, as
I have a progressive display. If you are encoding to a 30i file, you can
remove the yadif=1 filter form the filter chain.
> I thought - and it seems that Robert agrees now - that
> apart from being faster, deinterleaving has a good
> chance of providing better quality.
>> The second is much, much better.
> Why do you think so?
I have tried it, and seen it with ffplay.
> (Apart from the fact that I don't understand the
> filterchain "interlace,yadif": It never makes sense imo.)
It's there to be able to visually see the result. Remove the yadif filter
from the end of the filter chain if you are encoding a file.
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