Zoom & Pan filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>
avcodec/utvideodec: Increase vlc len

Fixes a regression since fb3e380 similar to ticket #2661,
reported by fluffrabbit at aol dot com.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/huffman/ff_huff_gen_len_table: support skiping stat=0 entries

This is probably not the simplest solution but as this is needed for a bugfix,
simplification is left for later.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/utvideodec: fix use of get_vlc2()

The max depth is 3

Found-by: Christophe Gisquet <christophe.gisquet@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/utvideoenc: skip unused huffman entries

This very slightly improves compression
Found-by: Christophe Gisquet <christophe.gisquet@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>