Daala Codec (Xiph)

An experimental video codec from the Xiph.Org Foundation that aimed to achieve next-generation compression (the effort preceded and influenced AV1). Daala introduced novel techniques like lapped transforms and per-pixel entropy coding. Its codebase is open and served as a sandbox

Link

• Visit resource

Related resources

• av1-codec-comparisonGoogle internship research project comparing SVT-AV1 and rav1e coding tools against libaom for quality and speed.
• Performance Comparison of AV1, JEM, VP9, and HEVC EncodersFraunhofer HHI SPIE 2017 paper comparing codec internals, BD-BR, and complexity across AV1, JEM, VP9, and HEVC.
• bitstream_based_modelsITU-T P.1203/P.1204 bitstream parser for H.264/H.265/VP9 extracting QP, motion vectors, and transform coefficient stats for quality modelin…
• Comparing H.265/HEVC and VP9: Impact of High Frame Rates on Perceptual QualityAcademic comparison of HEVC and VP9 codecs under high frame-rate conditions, including ffmpeg/libvpx tuning parameters used.
• rAV1atorGUI application for rav1e video encoding paired with Opus audio encoding.
• Opus (xiph/opus)Reference implementation of the Opus audio codec, recently adding deep-learning-based packet loss concealment.
• Differentiable VMAF Re-implementation on PyTorchDifferentiable PyTorch reimplementation of VMAF metric enabling gradient-based codec/RDO optimization, with companion code.
• nano-hevcMinimal educational HEVC encoder written in pure Python, readable-over-fast, for teaching codec internals.
• dav1d.wasmWASM port of the dav1d AV1 decoder, SIMD-optimized with TypeScript interfaces, aimed at production use in browsers.
• FOSDEM 2024: VVdeC<>Arm — Optimizing an Open Source VVC Decoder for Arm ArchitecturesFOSDEM Open Media devroom talk detailing Arm-specific performance optimization work on the open-source VVdeC VVC decoder.