Changes from JCTVC-A124 Contact: Woo-Jin Han, wjhan.han@samsung.com 1. Removed tools 1.1 MVAC (motion vector accuracy control) - Enables to limit the motion accuracy up to 1/2 accuracy in B-slices for complexity reductio - Not used in CfP submission - Command line option in A124: MVA 1.2 SHV (simultaneous H & V motion partition) - Enables to use motion partition composed of quarter and remaining regions - Not used in CfP submission - Command line option in A124: SHV 1.3 RNG (random noise generation) - Insert Gaussian noise into the reconstruction file to improve perceived quality in flat areas - Not used in CfP submission - Command line option in A124: RNG 1.4 LOT (logical transform) - Perform 5-3 wavelet + DCT if physical transform size is smaller than requested transform size - Used in CfP submission only for 128x128 block - Command line option in A124: LOT 1.5 CADR (contents-adaptive dynamic range) - Performance source scaling within bit-depth limit - Used in CfP submission - Command line option in A124: CAD 1.6 LCT (low-complexity transform) - Low-complexity version of large integer transform - Not used in CfP submission - Command line option in A124: LCT 1.7 EXC (extreme correction) & BDC (band correction) - In-loop post filters based on pixel statistics - Used in CfP submission - Command line option in A124: EXC 1.8 PTM (pattern matching intra) - Pixel-based pattern matching technique for intra prediction - Used in CfP submission - Command line option in A124: TMI 1.9 MPI (multi-parametric intra) - Multi-parametric post-processing of intra prediction - Used in CfP submission - Command line option in A124: MPI 1.A CCCP (color correlation based chroma prediction) - Chroma intra prediction based on luma reconstruction - Used in CfP submission - Command line option in A124: CCP 1.B ACS (adaptive coefficient scanning) - 3 scanning patterns are used selectively (zigzag, horiz, vert) - Used in CfP submission - Command line option in A124: ACS 1.C HAM (high accuracy motion) - 1/12th accuracy motion vector for luma and chroma - Used in CfP submission for both luma and chroma - Command line option in A124: HME, HAP, HAB 1.D HME: high accuracy motion estimation - HAP: HAM in P-slice - HAB: HAM in B-slice 2. Modified tools 2.1 DIF (DCT-based interpolation filter) - A124 uses 6-tap DIF for chroma - Replaced with AVC bi-linear (1/8th) since it uses HAM filters (1/12th), which are not included in TMuC. 2.2 GRF (generated reference frame) - Weighted, weight + offset, offset, affine, isotropic and perspective are supported - Not used in CfP submission - Command line option in A124: -v - w: weighted, o: offset, r: refinement, a: affine, i: isotropic, p: perspective - Affine, isotropic and perspective are removed but weighted prediction is remained due to simulate AVC WP - To activate: ¡®-v w¡¯ in command line (scale+offset) or ¡®-v o¡¯ for offset-only 2.3 AMVP (advanced motion prediction) - A124 software supports three AMVP modes - AM_NONE : use first candidate only (similar to AVC), no signaling - AM_EXPL : use explicit signaling (used in CfP submission) - AM_IMPL : use implicit signaling based on template matching - TMuC only has both explicit signaling mode and non-AMVP method - AM_IMPL is removed since it is not included in TMuC - AM_NONE is maintained since it can be a place-holder for non-AMVP method 2.4 CIP (combined intra prediction) - CIPflag is now coded only for intra blocks (bug-fix) - A124 codes CIPflag even in inter blocks 3. Option changes 3.1 JMQ (JM QP) - JMQ = 1: use JM QP assignments, JMQ = 0: use JSVM QP assignments - Option is removed and JMQ is always on - Option fix: JML (JM Lambda) 3.2 JML = 1: use JM lambda strategy, JML = 0: use JSVM lambda strategy - Option is removed and JML is always on 3.3 Option fix: ADI - Option is removed and ADI is always turned on 3.4 Option fix: AMV (AMVP) - Option is removed and AMVP is always turned on 3.5 Option fix: DIF - Option is removed and DIF is always turned on 3.6 Option fix: AMP - Option is removed and AMP is always turned on 3.7 Option fix: CIP - Option is removed and CIP is always turned on 3.8 Option fix: ROT - Option is removed and ROT is always turned on - Note: set ROT_DICT = 1 to disable ROT 3.9 Option fix: ACC - Try coefficient clearing in inter modes - Option is removed and ACC is always turned on 3.A Profile option (-p) - It was used to separate A124 and A125 coding tools - Removed, now 4. Misc. changes 4.1 MAX value of IBDI is fixed (IBDI_NOCLIP_RANGE MACRO) - Only allows possible values of bit-depth increased signal, not all possible values of inherent high bit-depth case 4.2 Encoder output is fixed - Slice size bit (32) is now added to the encoder print-out 4.3 Source code improvements - Unused functions are removed - Variable & function namings are changed to clarify its purpose 5. Known problems 5.1 POC coding - It's not implemented well. Currently, fixed 10-bit is used for POC coding. 5.2 ROT (rotational transform) - Inverse ROT code is not the best one on the aspects of the dynamic range although we already have better one. - It'll be replaced later with much simpler implementation.