If you have limited bandwidth then a lower resolution might be better. If you operate a server farm that can encode AV1 no problem, and your source video is 2160p or 4k, AND 8Mbps is no issue, then perhaps you shouldn’t bother downscaling to 1440p since you would be over-spending bits on the smaller resolution when you could have had the larger one.Įssentially, if you have bandwidth to spare, then you might be able to afford a larger resolution or higher fps. If you have limited bandwidth at 4Mbps, then perhaps you should limit your resolution to 1080p. The reasoning behind this, is so people can look at their available options and make a judgement call. The top scores look far better, and the bottom scores look far worse. In my opinion the mid-range of the 6Mbps tests look approximately as clear as most Twitch streamers’ live streams. I chose my bitrates carefully to represent bandwidth starvation and abundance. This test video is Overwatch gameplay in 2560×1440 at 60 fps. H.265/HEVC at the same bitrate is considerably better than the H.264/AVC version.įor the rest of this section, keep in mind a few things. QUICKSYNC H .264 HOW TOIf you want a tutorial on how to do it, ask in the comments. It is possible to use it through the recording tab and custom options but is beyond most streamers’ ability. However the “slow” preset is not readily available in OBS at the time of writing. Maxwell and Pascal NVENC preset “hq” is easy to use in OBS.x265 Medium produces equal quality to Kepler at only half the bitrate.The results exclude anything that scores below 60 on VMAF. Kepler at 4 Mbps produced an extraordinarily poor quality video.Results NVENC 1 VMAF Scores on 2560×1440 60 fps Also note that Maxwell 1st generation is NVENC 2nd generation, and Maxwell 2nd generation is NVENC 3rd generation. Note that the Maxwell card used in this testing was a GTX 980TI, which is second generation Maxwell. At least not at the time of writing this. Pascal and Turing support encoding 10-bit HEVC but this is not easily accessible in neither OBS nor Handbrake. It is as easy to setup basic NVENC use in OBS as it is to setup QuickSync. Maxwell second generation and Pascal also have H.265 encoding capability, albeit without B-Frames. Kepler and Maxwell first generation had only H.264 encoding. To the best of my knowledge, no NVENC implementation offers hardware accelerated VP9 encoding. NVENC Part 2 will examine Turing chipsets separately. As of 2019 with the Turing RTX 2080, 20 cards, compression has improved substantially. One advantage was for users of non-QuickSync CPUs, since they could now have hardware encoding in the graphics card. In 2012, NVIDIA released their own hardware encoder.
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