[FFmpeg-devel] [PATCH] added reitnerlace filter

[Vasile Toncu]

On 27.12.2017 15:31, Nicolas George wrote:
> Vasile Toncu (2017-12-27):
>> It is because of licencing issues. I wanted the new filter to be LGPL.
> Thanks for the explanation. That is a valid reason.
>
> But as is, it would result would be duplicated code for people who do
> not worry about licensing.
>
> Are there any features that tinterlace has and this new filter has not?
> If not, then I think it would be better to just replace tinterlace
> entirely.
The main difference between those those two filters is that reinterlace 
processes
planes of output frames in parallel.

Another difference is that reinterlace introduces two new modes, which 
are described at [1]
> I can answer myself: tinterlace has asm optimizations. This is not for
> me only to decide, but I am rather against having duplicated features
> just for licensing reasons.
> In this particular instance, I think you could use the GPL asm
> optimizations while having the filter itself LGPL.
Your arguments are valid, but what happens if I want to use a GPL 
tinterlace in an closed source application that will be distributed.

[1] http://ffmpeg.org/pipermail/ffmpeg-devel/2017-December/223066.html