I am having a problem whereby noticeable compression artifacts (appearing as vertical streaks) are present in certain videos when exporting as HEVC with Magix Video Pro X14. These artifacts disappear when exporting as MP4/AVC instead. I thought that HEVC was not supposed to have any noticeable loss in quality when using the same average bitrate as AVC? Do I need to export all of my videos as MP4/AVC instead of as HEVC/MP4 if I don't want any noticeable compression artifacts in the videos?
https://nikkisandbox.dreamhosters.com/temporary/magix/
The operation that I need to perform is to rotate the video counterclockwise by 90 degrees and then export as MP4. I go to "Effects" --> "View/Animation" --> "Orientation" --> "Rotate". I tried exporting as both HEVC/MP4 (preferred) and MP4/AVC. The original video is 1080p60 MP4 with an average bitrate of 60 MBd (from a DSLR camera). I set the export for both AVC and HEVC as averaging 64 MBd with a maximum of 128 MBd and CPB as 15 MB. Maximum GOP Length is 60 and GOP Structure is Auto. Profile Level is set to the highest and Coding Quality is Best. HRD is enabled for MP4/AVC.
When attempting to export as HEVC MP4 after rotation, the video filesize is reduced from 6.97 GB to 43 MB, which seems much too small even for HEVC, so this could be an error in the HEVC encoding from Magix. Noticeable and unwanted compression artifacts are in the resulting video.
I am using 64-bit Microsoft Windows 10 Education for an AMD Ryzen 3 2200G CPU with 32 GB of DDR4 system RAM plus an AMD Radeon RX 550 GPU with 4 GB of GDDR5 dedicated graphics RAM.