Newer FFmpeg prohibits 4096x4096 MPEG-2, presumably because it violates
the standard.
http://git.videolan.org/gitweb.cgi/ffmpeg.git/?p=ffmpeg.git;a=commit;h=7fb87bc5f24b1be13269109506c05e4c54695b5e
(cherry picked from commit
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| .. | ||
| test_drawing.cpp | ||
| test_ffmpeg.cpp | ||
| test_fourcc.cpp | ||
| test_framecount.cpp | ||
| test_grfmt.cpp | ||
| test_gui.cpp | ||
| test_main.cpp | ||
| test_positioning.cpp | ||
| test_precomp.hpp | ||
| test_video_io.cpp | ||
| test_video_pos.cpp | ||