RFH.265 vs H.266: A Comparison of Video Codecs
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This article compares H.265 and H.266 video codecs, highlighting their similarities and differences. These standards were developed by ITU-T VCEG and ISO/IEC MPEG.
Introduction to H.265 (HEVC) and H.266 (VVC)
H.265 is formally known as HEVC (High Efficiency Video Coding), while H.266 is known as VVC (Versatile Video Coding).
The H.265 standard utilizes advanced compression algorithms to significantly reduce video data size while maintaining high video quality. It achieves a bitrate saving of 50% to 75% compared to its predecessor, H.264.
H.266 takes compression efficiency a step further than H.265. It boasts bitrate savings of about 50% compared to H.265, thanks to the incorporation of even more sophisticated compression techniques. These include in-loop filtering, improved intra-prediction, and advanced motion compression, all aimed at reducing video data size without compromising the viewing experience.
Key Differences Between H.265 and H.266
The following table summarizes the differences between H.265 and H.266 video codecs across various parameters:
| Parameters | H.265 (HEVC) | H.266 (VVC) |
|---|---|---|
| Standard | ITU-T H.265 (or MPEG-H Part-2) | ITU-T H.266 (or MPEG-H Part-3) |
| Year of Release | 2013 | 2020 |
| Bitrate Savings | 50 to 75% | 30 to 50% (vs H.265) |
| Max. Resolution | 8K | 8K |
| Frame Types | I, P, B, IDR | I, P, B, IDR |
| Partition Size | Coding unit: 8x8 to 64x64 | Coding unit: 4x4 to 128x128 |
| Pipeline size: 64x64 | ||
| Partitioning Transform | QT, Prediction: QTBT | QTBT + TT (NS, QT, BTx2, TTx2 = 6 partitions) |
| Intra Prediction | 35 modes | 81 modes |
| Entropy Coding | CABAC | CABAC + dependent scalar quantization, LUT based CAE |
| Loop Filters | Deblocking, SAO | Deblocking, SAO, ALF, LMCS |
| Supported Frame Rates | Up to 120 fps | Up to 120 fps |
| Error Resilience | Yes | Yes |
| Applications | 4K video, VR, 360° video | 4K video, VR, 360° video |
| Advantages, Disadvantages and Features |
