DaalaTodo

Simple Things

• Overflow checking for allocations in od_state_ref_imgs_init().

Tuning

• Quantization matrix
  • Rate-dependent QMs
• Beta (activity masking)
• PVQ RDO
• Better MV cost estimates
• Better MC distortion metrics (SATD, some MSE/SATD hybrid, no-ref-aware, maybe table driven Theora-style, etc.)
• Better MV split flag rate estimates
• Does the 8-pixel MV offset influence quality in any way?

Known Broken/Suboptimal

• Block size decision
  • Never tuned on inter
  • Not considering chroma
• Code quantizers on a log scale
• Re-order bitstream (e.g., don't code all MVs at the front, etc.)
• Investigate bias introduced by coefficient scaling
• Take into account scaling differences from lapping on variable block size
  • Including Haar DC
• Need "skip higher bands" flag
• Re-train zig-zags (particularly on inter)
• Implement RDO for "skip_rest" decisions.

New Work

• Motion vector "mask" based on previous frame
• Use coeff magnitude correlation for modelling
• Per SB/MB/block/something quantizer changes
• Variable Framerate support
• Dynamic frame size changes (without keyframes)
• Land paint-based deringing
• SPIHT as k-tokenizer
• MV prediction clustering
• Special case for K=2
• Train Laplace tables

Entropy Coding

• Make the Laplace vector encoder (aka k-tokenizer) faster
• Add "skip-all remaining bands" flag
• Better encoding of the CfL sign
• Add SIMD to the decoder search

Visualization

• Add ability to display decoder side information to player_example
  • Block size split decision
  • Cost in bits per block (use log scale)
  • No-ref and skip flags
  • Mode information (if we signal intra)
  • Motion vectors
  • Display prediction residual

Infrastructure

• Need a bugzilla instance for issue tracking

AreWeCompressedYet

Wiki page: AreWeCompressedYet

Website: https://arewecompressedyet.com

Bug tracker: https://github.com/tdaede/awcy/issues

• Huge batch run of all versions of Daala
• Look at rd_tool options and improve
• Add realtime constraint options for x265