Decoded output not cropped for non-integer multiple of SB size input
Created by: tmatth
To reproduce, encode akiyo_qcif.y4m. (176x144)
We need to skip non-visible blocks in
write_sb (done), change the dimensions that we write in
write_uncompressed_header (done), change how partitions are coded on the edges of the frame (not started),
get all sizes of intra-predictors (not needed since we force 4x4 everywhere).