FFV1 supports more than 8 bits by pixel. Add support for 10 and 12 bit depth (FFV1 encoder uses planar pixel format for these bitdepths). Fix pixel format for 8 bit output. Previously it was always RGBA. Co-authored-by: mvji <33432858+mvji@users.noreply.github.com> Pull Request: https://projects.blender.org/blender/blender/pulls/138192