Quote
I recently started shooting with a Hero 10 that uses HVEC compression. My prior Hero7 used h.264. I always shoot 1080 video at 60 fps. The bit rate for the h.264 files is 40000 and the bitrates for the HVEC files are nominally 44000, but they vary slightly. SVRT analysis of my h.264 video give me a usable profile that requires no rendering and results in super fast renders and no loss in quality. But the SVRT for the HVEC video is not usable and the renders produced by the profile analyer (custom profile of 1920x1080, 59.94 fps and a 44400 rate are excuciatingly slow and are lower quality than the original. I upgraded from PD15 to PD21 thinking that would fix the problem, but it did not. In fact, PD15 renders my HVEC files faster, although no better.
I'm no expert in video compression and I'm beginning to suspect that his might have something to do with variable frame rates. If so, is it possible to get lossless renders with HVEC in PowerDirector? Any thoughts on what, if anything, I might be doing wrong?
Could be one of many things:
1) Bug in SVRT, there have been many
2) Clips may have highly variable bitrate, SVRT typically requires near constant bitrate within some margin
3) Clips may have highly variable framerate, SVRT does not work with this
4) You have multiple clips in the timeline, and the variability between clips of items 2 and/or 3 can cause SVRT to not be available
If the above SVRT violations occur, not much one can do. Sharing a sample clip which SVRT does not work on may yield some insight. MediaInfo of the file or online use of online MediaInfo
https://mediaarea.net/MediaInfoOnline can give some insight into framerate and bitrate.
If you have to encode, a good high end GPU with H.265 hardware encoding often results in good quality and significant speed vs CPU encoding for most PC platforms.
Jeff