Not using hardware decoding by default

When generating FFMPEG commands in the GUI, despite having an NVIDIA GPU enabled for encoding, it does not specify “-hwaccel cuda” before the input file.

I discovered this more or less by accident when playing with command line flags, and it had two important consequences:
(A) Theses warnings vanished: “No accelerated colorspace conversion found from yuv420p to rgb48le.”
(B) My processing speed on decode:h265-8bit, enhance:ahq-9:no-scale, encode:av1-10bit went from 1.6 fps to 2.6 fps (+60% ish?)

  1. Missing hardware acceleration flags for decoding input files during processing/transcode.
  2. Windows, Topaz AI Video 5.1.2
  3. n/a
  4. n/a
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