Poor picture quality during HW transcode.


#1

Hello

I have Qnap TS-251+ nas and plex server running on it.
I bouth plex pass to be able use HW transcode function.
It works well with low hw resources, but in case of low bitrate 1080p movie , the picture quality is very bad.
With sw transcode the picture qualiti is same like the original.
But with hw transcode , the picture is checkered, blocky.


#2

https://support.plex.tv/articles/115002178853-using-hardware-accelerated-streaming/

There are a couple of drawbacks to Hardware-Accelerated Streaming:

The video quality may be lower, appearing more blurry or blocky. This is especially true and more noticeable when streaming at low quality levels below 720p. (Hardware-accelerated video encoders are faster, but lower quality than software encoders.)

#3

I understand this, but wery annoying.
For example a 2.9 Mbps 1080p content, with plex, is provide worse quality than SD movie with DLNA.
Is there any chanse to develop a switch into the transcoder settings , to use sw trancode when the bitrate lower than 5 Mbps?
Or something like that? If this quality issue can’t be corrected in the hw transcoder?


#4

Search the feature request forum area for anything mentioning hardware transcoding, and if nothing like your idea, suggest it.
It’s not a bad idea.
I’ve seen other posts ask to allow advanced parameters for the transcoder too. I use handbrake, and it has a way to allow parameters that help QSV acceleration. Though QSV encodes for me with those settings are still not as good quality as software encoding, it’s closer and still 2-3x as fast.


#5

Can we await a picutre quality improvement during HW transcode? Because yesterday i saw the same blocky picture during 12 Mbps 1080p video. This is unacceptable . I paid for a feature what is unusable.