When using a standard CBR of 240Mbps; curious if the preset of "best quality" is necessary? Or should I be using high speed?
@LongIslander IMHO given the serious increase in render times over High speed, not worth it.
The screenshot below from my log file using ffmpeg (FHD not UHD) gives 4 examples, Best Quality, Balanced, High speed and an Nvenc hardware encoded file, much faster render times again. Higher values are better.
The VBR Nvenc file "00d ... " was set at 240/240 but has a much smaller data rate and output size of 151MB vs 725MB and 225 Mbps vs 47 Mbps. A 27 second 25 fps FHD reference clip was used.
I meant to say also that 3 frames appear to be missing (in VP) in the CBR output files, at the start of the file. To align with source you need to move the clip 3 frames. This wasn't the case with the VBR file.
But Mediainfo displays all 4 have the same duration, some I'm guessing that its just a timestamp issue.
VMAF values added here ...
Thank You.
👍
Highest quality improves motion estimation. That's why it takes a little longer. If you can't see a difference, you probably don't need it. Likewise, CQ / CRF encoding is so good that you don't need CBR, because it puts the bits where you need it. I guess if I was encoding Bladerunner, I might be tempted to Use CBR just for expediency...
Likewise, CQ / CRF encoding is so good that you don't need CBR, because it puts the bits where you need it.
That's why I render with Voukoder, it puts the bits where needed and doesn't waste them when not needed.
Thanks for all the help guys. I can't believe how much faster HEVC high-speed is than XAVC-S. I have a 16 minute project at 4k 59.94 fps. XAVC-S took 4 hours 30 minutes to render. Magix HEVC took 1 hours 30 minutes. (With a higher overall bitrate AND GPU acceleration off). 👍