This freely downloadable report measures the qualitative impact of GOP sizes on animated, general entertainment, sports, and office footage for H.264 and HEVC.
One of the most fundamental encoding decisions is GOP size or the frequency of I-frames in our encoded files. I-frames, also called keyframes, start each “group of pictures” comprised of I-, B-, and P-frames. Most of the time, our GOP size, or I-frame interval, is dictated by adaptive bitrate considerations like choosing a GOP size that divides evenly into your segment size. But even then, you have multiple options. In addition, what GOP size should you use when encoding a single file for disk-based playback or progressive download?
This report helps you decide. It measures:
- VMAF quality
- Of 13 files in four genres (animations, general entertainment, sports, office)
- With keyframe intervals ranging from 1/2 second to 20 seconds
- Encoded with x264 and x265
No registration is required; click here to download the report. GOP-Size_report_11_16.pdf (231 downloads)