Sony's 2013 H.264-based codec for 4K recording: XAVC-I (Intra-Frame, 223–880 Mbit/s), XAVC-L (Long GOP, 50–185 Mbit/s), and XAVC-S (consumer).
Technical Details
XAVC exists in three main variants: XAVC-I (Intra-Frame), XAVC-L (Long GOP), and XAVC-S (for consumer cameras). XAVC-I compresses each frame individually with bitrates from 223 to 880 Mbps for 4K, while XAVC-L uses inter-frame compression and achieves data rates of 50 to 185 Mbps. The codec supports 4:2:2 10-bit color sampling in professional variants, while XAVC-S is limited to 4:2:0 8-bit. Audio recording is done in PCM up to 24-bit/96kHz or as compressed AC-3.
History & Development
Sony introduced XAVC in 2013 as a response to the growing 4K market, after AVCHD reached its limits for higher resolutions. The first implementation was in the Sony PMW-F55 CineAlta camera. In 2014, XAVC-S followed for consumer cameras like the Sony FDR-AX100, while XAVC-I was introduced in 2016 for professional post-production workflows. Since 2018, XAVC has also supported HDR standards like HLG and PQ.
Practical Use in Film
XAVC-I is suitable for color grading-intensive productions, as intra-frame compression allows for precise color correction. Documentarians prefer XAVC-L due to the lower data volume for long takes. Netflix accepts XAVC as a delivery format for 4K content. The codec enables 4:1 proxies for smooth editing in Avid Media Composer and Adobe Premiere Pro, while the original files remain available for finishing. Multicam synchronization works frame-accurately through the embedded timecode.
Comparison & Alternatives
XAVC offers better file compression than ProRes at comparable quality but requires more processing power for decoding. Compared to DNxHD/DNxHR, XAVC-L achieves similar image quality at lower bitrates. HEVC/H.265 codecs like Sony XAVC-HS achieve 50% smaller files but are more computationally intensive. For pure Sony workflows, XAVC integrates seamlessly, while mixed camera setups often use ProRes or DNx as a common denominator.