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

Why are you encoding a file that’s already been encoded?

[–] Showroom7561@lemmy.ca 8 points 1 month ago

Basically saving space. The dashcam I use records in h264, and I've been saving space (50%) by converting them to h265 (through my Samsung phone). Handbrake is far more convenient for these batch conversions.