[Bug Report] hwaccel not supported on AMD APU due to failing check

[Jglrz]

ffmpeg hwaccel h264_vaapi tests fail with AMD APU on Linux (tested in Docker) because stash/pkg/ffmpeg/codec_hardware.go tests scaling with videoFilter = videoFilter.ScaleDimensions(-2, 160), which results in scale=%v:%v at scale=224:160, but the driver requires minimum width to be at least 256px.

[h264_vaapi @ 0x56569028cf80] Driver does not support some wanted packed headers (wanted 0xd, found 0x1).
[h264_vaapi @ 0x56569028cf80] Hardware does not support encoding at size 224x160 (constraints: width 256-4096 height 128-2304).