Handbrake: Support encoding to GIFs

[n2bisex4u]

Description of problem or feature request

Support encoding to GIFs

Steps to reproduce the problem

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HandBrake version (e.g., 1.0.0)

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Operating system and version (e.g., Ubuntu 16.04 LTS, macOS 10.3 High Sierra, Windows 10 Creators Update)

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[sr55]

Closing as duplicate of #581

Please see #581

[cehoyos]

Why was this closed as a duplicate?
Issue #581 is about decoding animated gifs which should be possible with current libavformat and libavcodec, this ticket is about encoding gifs: In principle, this is also possible with updated libraries but pal8 input has to be provided to the gif encoder: libswscale does an ugly conversion, the palettegen and paletteuse filters are needed to create nice gifs needing two passes.

[sr55]

Updated to rejected. Sorry mis-read.

We don't intend to add gif creation support. Sorry.