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Handbrake local vs docker on Synology DS920+: same settings, very different results? (lemmy.ca)
submitted 1 month ago by Showroom7561@lemmy.ca to c/selfhosted@lemmy.world
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I'm hoping someone could shed some light as to what's going on here.

I was able to get Handbrake installed on my Synology DS920+ NAS with Intel Quick Sync support. Using the exact same settings that I do on my local installation of Handbrake, the file size and end results appear vastly different.

I've tested different video files, but also the exact same one.

For example:

  • Original file H.264 1.3 GiB 18.1MBits/s bitrate
  • Handbrake local H.265 459 MiB 6.42 Mbits/s bitrate
  • Handbrake docker H.265 973 MiB 13.6 Mbits/s bitrate

My settings are:

  • Video encoder: H.265 (Intel QSV)
  • Framerate: Same as source
  • Variable framerate
  • Preset: Quality
  • Constant Quality: ICQ 32
  • Multi-pass encoding enabled.
  • Profile: Auto
  • Level: Auto
  • Filters: off
  • Dimensions: default (no resize, rescale, etc.)
  • Audio: AAC (avcodec) (mono)
  • Web optimized: Yes
  • Align A/V start: Yes
  • Passthrough Common Metadata: Yes

Is there an oversight that I'm missing that could explain this? I'd rather use the Docker version, since it doesn't tie up my main laptop.

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[–] Showroom7561@lemmy.ca 3 points 1 month ago (1 children)

The NAS (Synology DS920+):

  • CPU: Intel Celeron J4125 4-core 2.0 GHz, burst up to 2.7 GHz
  • RAM: upgraded to 20GB
  • NVME cache: 256GB
  • HDD are all Seagate ironwolf 8GB x 3 and a 4TB.

Laptop (Framework 13 11th Gen intel):

  • CPU: Intel Core i5-1135G7 (integrated Iris Xe Graphics 80EU)
  • RAM: 64GB
  • Storage: 2TB WD Black 770

I would expect a difference in speed between the two, but does the hardware affect the output quality/size if the settings are identical?

[–] ms_lane@lemmy.world 4 points 1 month ago (1 children)

but does the hardware affect the output quality/size if the settings are identical?

Yes, your laptop has a much newer quicksync block with proper HEVC hardware-

NAS is Gemini Lake, which uses QS from Broxton/Apollo Lake/Gemini Lake

Laptop is Tiger Lake, which uses about 3 versions newer QS, for Tiger Lake, Alder Lake and Raptor Lake.

Broxton QuickSync doesn't actually have an asic encoder path for HEVC, it's all via shaders.

[–] Showroom7561@lemmy.ca 2 points 1 month ago (1 children)

I found my answer then! I appreciate that 👍

[–] ms_lane@lemmy.world 2 points 1 month ago

No problem :)