The fastest and safest EVC encoder and decoder

Table of Content

• Overview
• Features
• Roadmap
• Usage
  • Compressing video
  • Decompressing video
  • Benchmark
• Contributing

Overview

MPEG-5 Essential Video Coding (EVC) baseline profile is royalty-free. It includes only technologies that are more than 20 years old or that were submitted with a royalty-free declaration. Compared to H.264/AVC High Profile (JM19.0), MPEG-5 EVC Baseline Profile (ETM 6.1) provides about 30% BD-rate reduction with reduced encoding computation complexity and comparable decoding computation complexity.

REVC is a Rust-based EVC (baseline) video codec implementation.

Features

• Coding Structure
  • Quad-tree based coding structure up to 64x64 block size
• Intra Prediction
  • DC, horizontal (H), vertical (V), diagonal left (DL), diagonal right (DR) for intra prediction
• Inter Prediction
  • Un-directional and Bi-directional inter prediction
  • Temporal direct mode
  • Three spatial neighbouring motion vectors and one temporally co-located motion vector
  • 1/2 and 1/4-pel interpolation
• Transform and Quantization
  • 4x4 to 64x64 DCT
  • QP range: 0 to 51
  • Run/level symbols with zig-zag scan
• Loop Filter
  • Deblocking filter in H.263 Annex J
• Entropy Coding
  • Binary arithmetic coding scheme in JPEG Annex D

Roadmap

• 0.1 Translation:
  • Translate ETM baseline decoder from C to Rust
  • Translate ETM baseline encoder from C to Rust
• 0.2 Optimization:
  • profiling and benchmarking
  • memory/cache optimization
  • assembly optimization
    • armeabi-v7a
    • arm64-v8a
    • x86
    • x86_64
  • multi-threading optimization
• 0.3 Modernization
  • rate control
  • practical usecases: RTC, Live Streaming, VOD, etc

Usage

Compressing video

Input videos can be in raw yuv (I420) format or y4m format. The monochrome color format is not supported yet.

cargo run --release --bin revce -- -i scripts/foreman_qcif8.yuv -w 176 -h 144 -z 30 -f 8 -q 27 -r scripts/tmp/rec.yuv --keyint 8 --ref_pic_gap_length 8 --skip 0 --disable_dbf --inter_slice_type 1 -o scripts/tmp/test_ld_p.evc -v
cargo run --release --bin revce -- -i scripts/foreman_qcif8.y4m                     -f 8 -q 27 -r scripts/tmp/rec.y4m --keyint 8 --ref_pic_gap_length 8 --skip 0               --inter_slice_type 0 -o scripts/tmp/test_ld_b.evc -v

Decompressing video

Decoder only supports MPEG-5 EVC baseline profile. Output videos can be in raw yuv (I420) format or y4m format

cargo run --release --bin revcd -- -i scripts/tmp/test_ld_p.evc -o scripts/tmp/test.yuv -v
cargo run --release --bin revcd -- -i scripts/tmp/test_ld_b.evc -o scripts/tmp/test.y4m -v

Benchmark

Benchmark each component with Criterion.

cargo bench --features bench

Contributing

Contributors or Pull Requests are Welcome!!!