Possibly related issue:
Friend started watching some of these HEVC shows I have. It’s transcoding for him to 720p (apparently all my upload of 8 mbps can support), which seems to cause “blue lines” in certain scenes. It’s not in the source video itself or when directly played. At original quality, the scene plays beautifully. Seems to be identical to this old forum post here:
I see references to the VAAPI driver, and something about a bug in it that possibly causes an offset in certain colors in certain modes? Anyway, the post near the end has one person vowing to run a script that eliminates “:format=nv12” from some Plex Transcoder file every update. The last reply at all was over a year ago in which PMS 1.18.1 supposedly fixed the issue.
Well, it’s back. I don’t know if it’s related to forcing use of this old VAAPI driver in order to transcode HEVC video with subtitles, but the timing of it seems odd.
It happens to my friend because my server is transcoding to a lower bitrate than normal, but I can reproduce it using the Plex For Windows app locally by forcing a lower bitrate for my video. Here are some images (super huge, sorry, I do not know how to reduce size, so this is original screenshot size. Top is image running at 720p transcode, bottom is original quality. Not the vertical stripes near the mountain-top and the edges of clouds:
Doesn’t seem to matter if subs are enabled or not. I think they mentioned subs in the old post as a cause because that was causing a transcode rather than a direct play?
