Hardware Acceleration on NAS and Android

[remuxonly]

Hello. Can one of you guys kindly educate me on the process of transcoding and encoding when streaming an x265 4k file from my NAS to my phone (galaxy s24u) via the jellyfin app?

My NAS has a pentium gold 8505 and I have enable hardware acceleration (intel quicksync) in the settings. I can see my NAS' gpu spike when I lower the 4k file to 1080p but there's 0% usage when I'm streaming at full bit-rate. Does this mean that transcoding and decoding is not occurring and my phone is simply streaming the full file from my NAS?

Thank you in advance!

[Efficient_Good_5784]

...but there's 0% usage when I'm streaming at full bit-rate. Does this mean that transcoding and decoding is not occurring and my phone is simply streaming the full file from my NAS?

Thank you in advance!

If the video is direct playing, then no transcoding is happening.

All Jellyfin clients will never transcode. Transcoding is the sole job of the server, not of the clients. A transcode is necessary to convert videos to be playable by the client.

It depends on the client, but no matter what, all videos need to be decoded by a device so that it can be played on a screen. It could be the CPU or GPU on your phone doing the decoding, but the decode will happen regardless.