Memory allocation is excessive, possibly leading to crashes.

Memory usage has been analyzed for the following case: class B encoding with max CU=32x32, memory snapshot during encoding of 2nd frame

• Transform coefficients:

9 TComList objects 2040 CUs per frame 3 32x32 integer arrays per CU (luma+2*chroma), each array is 4KB 9 * 2040 * 3 * 32 * 32 * 4 = 215MB

• Luma frame buffers: 40 * 4.48MB = 179MB
• Chroma frame buffers: 79 * 1.12MB = 89MB
• Bitstream buffers (TComBitStream objects): 8 * 11.87MB = 95MB

Also see attached jpeg file

Comments from Tourapis, Alexis. Thanks!

Currently motion vector and reference indices use Int-type variable. There are other cases using unnecessarily long variable type. Check them and replace them by suitable types. It can reduce memory considerably.

Current software uses bi-linear interpolation filter for chroma when InterpFilterType=0, 3 and 4 while luma 1/8th filter is used for InterpFilterType=1 and 2.

Configurability of the use of luma 1/8th interpolation filter for chroma (possibly different default number of taps of chroma, but not new filter) is preferable.