i have a problem with my plex version 1.13.2.5154 64bit and NAS DS918+.
if i stream a bluray movie 1080p on my plex with hardware acceleration ON than i have the massages that the server to weak is for transcodering (cpu 25%).
if i stream the same movie with acceleration OFF than is it oke voor watching on streaming (cpu 98%)?
i have also tested with a movie without sound with acceleration ON and then is is oke for playing.
acceleration ON = video ons hardware en sound software
acceleration OFF = video and audio on software
Hugo,
Most of the time we see 98% utilization is when HEVC + Subtitles are being used.
The DS918+ can decode HEVC and encode H.264 easily
Certain audio codecs will push CPU utilization to 25%. Audio is always done by the CPU
Subtitles become the problem. Subtitles are always done in software (CPU) and that’s where utilization will go very high. (Intel does not support HW subtitle processing)
What can you tell me about the video file? Do you have the XML?
Knowing your subtitles are PGS (image based) tells us all we need to know.
Most players don’t accept image-based subtitles. Intel doesn’t provide support for hardware acceleration of them either. This means the CPU has to do it. You are seeing what happens when the CPU has to image-based subtitle burning.
The only way to resolve this is to find text-based subtitles (SRT, ASS, or SSA format) for PMS to use.
Given the PGS are in the MKV; go look in the MKV to see if SRT, ASS, or SSA are available. Usually you’ll find SRT subtitles. Simply remux the MKV and drop out the PGS subtitle stream. Be certain to keep a copy of the original until you’re certain you have what you want to keep.
@ChuckPa Is there a guideline for successful transcoding with PGS forced subs? For example if it’s 2k per transcoding, does this go to 4k? Just looking to see how much more intensive it is to transcode a 1080p bluray down with PGS forced on. Thanks!
PGS subtitles are image format. The hardware transcoding ASIC does not support this.
The only way to burn these images into the video is with having enough CPU.
It’s this way because almost none of the televisions/ players have the ability to overlay one image format over another.
