[FFmpeg-user] De-telecine, deinterlace, and filter chains

[Andy Furniss]

Andy Furniss wrote:
> Andy Furniss wrote:
>
>> Vid looks like it's scaled up from 480 height and pillarboxed, so
>> the weave is not line for line anymore.
>>
>> It's probably been scaled as progressive which on strong chroma
>> will (I think) be un-mendable. Saying that the sample can be scaled
>> down to 480 and the weave is 1:1 again, which holds out the
>> possibility that you could make it interlaced again with tinterlace
>> and try to get IVTC to run on that.
>
> Maybe tinterlace was a crap idea as IIRC it would need field rate
> input. Another way could be to scale down to 480 do a field rate
> deint and drop duplicated frames.

Though that's not really correct either.

Whatever further processing is done, I think that scaling down to 480 is
going to be the first step. I live in pal land, so don't have experience
of dealing with ntsc.