Last but not least: Do you really need 4K for "on the go"? Are we talking about a phone here? Laptop? I personally don't think you need 4K on anything smaller than a 27" screen, but that's just me. Usually you can turn down the constant quality a bit and still preserve the details, but if you want a close-to-original quality you'll be stuck with your movie being up to twice as big as one without film grain. Another tip: Older movies with lots of fine film grain need will increase your file size a lot.If you don't lower the bitrate, you can just set it to Auto Passthrough to save the audio encoding time. Audio: Depending on your output device (and how much you value high quality sound), you can lower the bitrate a bit - 112k AAC should be fine for Stereo, for 5.1 you could try one or two steps lower than your input bitrate.I recommend chosing a normal or fast/action-heavy scene for your 1-min sample. Note that this is only a rough estimate since the bitrate is not constant - the credits at the end might have a bitrate of 1500, an action scene can be 6000, depending on your quality setting. Alternatively, choose your target filesize (8GB should be decent for a 100min 4K movie) then do the same thing as in step 2, except this time you multiply the filesize of your 1-minute sample to estimate the final size.Once you decided what's the lowest quality setting that still looks great for you, encode the full movie with it.Obv it would be best to check those samples on a 4K screen, a 1080p monitor would work as well, maybe you could zoom in some screencaps. Make a sample 1-minute encode for each quality setting, and see for yourself if it looks good or noticably worse than the source. Play with the constant quality option, I guess between 18 and 24.NVENC is wicked fast but much less efficient. Definitely go with CPU h265 (or h264 for compatibility, idk).
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