TODO

Be sure to read the wiki page about contributing code back to x265 before starting any work.

Quality/Efficiency TODOs

• RD refine for motion vectors - if bestMode is inter (not merge) with residual, do fpel and subpel refine steps measuring (psy) RD cost for each step. RD 5 and 6 only
• BIDIR refine, subpel (and perhaps fpel) refine steps on L0 and L1 MVs, use subme level to enable subpel, then fpel refine
• QPRD
• optimal TMVP coloc selection by using lookahead data
• --tune psnr and --tune ssim should leave cu-tree effective, re-evaluate strong-intra-filter default

Performance TODOs

• estimate whether SAO should be used for a frame prior to coding it (using lookahead or slice-type or other data) so we can avoid second encode pass for frames that likely do not need SAO coding.
• replace floats/doubles with int64 in SAO
• early out in ME if any cand cost is 0? move candidate mvp selection into motionEstimation()
• assembly code to replace remaining intrinsic primitives (mostly large transforms)
• inline assembly for gcc, and if possible MSVC

Feature TODOs

• allow user to inject additional SEI at a particular picture
• zero-latency: dependent slice segments, etc
• ESA motion estimation (x265 has unoptimized full search)

Known Bugs

• PSNR & SSIM bounds fully respecting conformance window

Steve's TODO list

This is just a paste of my current TODO list

• multi-pass RC docs
• crf-min/crf-max docs
• analyze transform sizes with psy-rd use
• debug lossless encode paths for inefficiencies
• sanity_check() error handler (clean aborts)
• remove _t from internal types
• add IPB avgQPs to x265_stats
• fix names and behaviors of stats
• expose param string table
• remove all constructors/destructors and use of 'new/delete' operators for exception-free malloc failures in embedded environments. virtual functions and vtables need to be removed to allow memset initialization of all structures.