VBR uses a higher bit rate, meaning less video compression, when the scene calls for it, e.g. Without being able to use VBR however, none of these would be my preferred choice if I wanted/needed the best quality at the smallest file size. The 2 AVC video files looked very close to the original - the main difference was the original was a bit sharper - while as I mentioned, there was a bit of noise with the H.265 video. With a Ryzen 2700 & the RX470, during GPU assisted encoding CPU = ~20%, GPU = ~50% - AVC without GPU assist CPU = ~ 30%, GPU = 0 - H.265 CPU = ~93%, GPU = 0. The H.265 encoder is not set up as well - of the 3 it was the only one that showed noisy artifacts, plus the larger file size - so again not a completely accurate comparison. To try and get a hint of the converter's performance without GPU assist & with encoding settings not tuned just for speed, I encoded the same clip with the same settings to H.265, which is *very roughly* similar, and it took just a little longer than the GPU assisted AVC conversion, with a file size of almost 138 MB. That alone would make the GPU assisted encoding take longer. The AMD encoder used something called CABAC - the X264 encoder settings did not - which takes more processing, both encoding & viewing, but being more efficient, creates smaller files. Using the AMD GPU assist, it took just over 6 minutes with a file size of 117 MB - it took less than 1/2 that time with the GPU assist off, with a file size of 120 MB. I converted 10 minutes worth of a 1080p AVC video with a max bit rate of 29.7 Mb/s to AVC 720p at a fixed bit rate of 1.5 Mb/s. Unfortunately I can't measure the difference in performance, because with the AMD GPU assist turned off, the hard coded X264 encoder settings are tuned more for speed than quality or efficiency, so the results don't really match. I tested using an AMD graphics card, and rather than using the pretty limited hardware acceleration available with the X264 H.264/AVC encoder that's included in ffmpeg, the Aiseesoft converter went the extra mile and used AMD's GPU-based encoder.
Aiseesoft Total Video Converter, while well-polished, is basically your more-or-less average ffmpeg converter with additional capabilities for GPU assisted re-encoding.
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