![]() Graph captured from FFmetrics v1.0Īll hardware encoders still fall short of a proper two-pass software encode with x264 using veryslow preset, which scored 97.33, but that is not a comparable use case. Here we can see AMD is the red is still a bit below its competitors, with Intel in the blue and Nvidia in the orange. Whereas previously they were over two full points behind without B-frames. AMD is now less than a VMAF point behind. This same video scored a VMAF of 96.13 with Nvidia’s NVENC and the high score of 96.37 to Intel’s QSV. Is AMD better than everyone else finally?ĪMD might not be smoking everyone else, but they are a solid contender! It also had a over a full point increase in VMAFfrom 94.12 to 95.39 (out of a possible max of 100). Overall the first 2 minutes of Big Buck Bunny encoded from raw Y4M video to H.264 had almost two full point increases on PSNRfrom 41.694 to 43.326 (out of a possible max of 48). Because of how b-frames operate, they have quality drops compared to the frames around them, however because they are so small, they allow the P and I frames to be much higher initial quality. We can see that there are several places that greatly benefit by saving bitrate with B-frames (the places the b-frame orange line is far above the blue line.) Notice how jagged the line with B-frames is as well. We are looking at a frame by frame score, with the frame number as the x-axis is on bottom and VMAF is the Y-AXIS. The blue line is the encoding without B-frames, and the orange line is with B-frames. 5000 kbps is right in the range Twitch suggests for 1080p. We are using variable bitrate based encoding as hardware encoders are designed with streaming in mind, and they usually requires a set bitrate. This graph was generated using FFMetrics v1.0, and shows a small section of the encoding of Big Buck Bunny at 5000 kbps. I am happy to report that with a quick test, that yes, the B-frame is back and does help!
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