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Reduce framerate before downscaling

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It is cheaper to drop frames and downscale those that remain than it is
to downscale all frames and then drop some of them. This is achieved
with the filter chain `-cv fps=FPS,scale=W:H`, and perhaps was the
original intention. The plain `-r` and `-s` flags do not execute in
order though - they each put themselves at the *end* of the filterchain,
so `-r FPS -s WxH` actually applies the scale filter first, and then the
rate filter.

This fix can halve the CPU used by the detect ffmpeg process.
This commit is contained in:
Andrew Reiter 2023-07-03 17:01:59 -04:00
parent 12d4a47e3d
commit be1c72eed4
1 changed files with 8 additions and 8 deletions
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16
frigate/ffmpeg_presets.py
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@ -107,14 +107,14 @@ PRESETS_HW_ACCEL_DECODE = {
} }
PRESETS_HW_ACCEL_SCALE = { PRESETS_HW_ACCEL_SCALE = {
"preset-rpi-32-h264": "-r {0} -s {1}x{2}", "preset-rpi-32-h264": "-vf fps={0},scale={1}:{2}",
"preset-rpi-64-h264": "-r {0} -s {1}x{2}", "preset-rpi-64-h264": "-vf fps={0},scale={1}:{2}",
"preset-vaapi": "-r {0} -vf fps={0},scale_vaapi=w={1}:h={2},hwdownload,format=yuv420p", "preset-vaapi": "-vf fps={0},scale_vaapi=w={1}:h={2},hwdownload,format=yuv420p",
"preset-intel-qsv-h264": "-r {0} -vf vpp_qsv=framerate={0}:w={1}:h={2}:format=nv12,hwdownload,format=nv12,format=yuv420p", "preset-intel-qsv-h264": "-vf vpp_qsv=framerate={0}:w={1}:h={2}:format=nv12,hwdownload,format=nv12,format=yuv420p",
"preset-intel-qsv-h265": "-r {0} -vf vpp_qsv=framerate={0}:w={1}:h={2}:format=nv12,hwdownload,format=nv12,format=yuv420p", "preset-intel-qsv-h265": "-vf vpp_qsv=framerate={0}:w={1}:h={2}:format=nv12,hwdownload,format=nv12,format=yuv420p",
"preset-nvidia-h264": "-r {0} -vf fps={0},scale_cuda=w={1}:h={2}:format=nv12,hwdownload,format=nv12,format=yuv420p", "preset-nvidia-h264": "-vf fps={0},scale_cuda=w={1}:h={2}:format=nv12,hwdownload,format=nv12,format=yuv420p",
"preset-nvidia-h265": "-r {0} -vf fps={0},scale_cuda=w={1}:h={2}:format=nv12,hwdownload,format=nv12,format=yuv420p", "preset-nvidia-h265": "-vf fps={0},scale_cuda=w={1}:h={2}:format=nv12,hwdownload,format=nv12,format=yuv420p",
"default": "-r {0} -s {1}x{2}", "default": "-vf fps={0},scale={1}:{2}",
} }
PRESETS_HW_ACCEL_ENCODE_BIRDSEYE = { PRESETS_HW_ACCEL_ENCODE_BIRDSEYE = {