[FFmpeg-user] Speeding up a script.

[Evert Vorster]

Hi there.
I am using a quite convoluted filter in ffmpeg.
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#!/bin/bash
#This will split, defish, blend and re-assemble Samsung Gear 360 video
map_dir="/data/Projects/RemapFilter"
ffmpeg -y -i "$1" \
-i $map_dir/lx.pgm -i $map_dir/ly.pgm -loop 1 \
-i $map_dir/Alpha-Map.png \
-i $map_dir/rx.pgm -i $map_dir/ry.pgm \
-c:v hevc_nvenc -rc constqp -qp 26 -cq 26 \
-filter_complex \
"[0:v]eq=contrast=0.8:brightness=-0.01:gamma=0.7:saturation=0.8[bright]; \
 [bright]split=2[in1][in2]; \
 [in1]crop=in_w/2:in_h:0:in_h[l_crop];\
 [in2]crop=in_w/2:in_h:in_w/2:in_h[r_crop]; \
 [3]alphaextract[alf]; \
 [l_crop]vignette=angle=PI/4.6:mode=backward[l_vignette]; \
 [l_vignette][1][2]remap[l_remap]; \
 [r_crop]vignette=angle=PI/4.8:mode=backward[r_vignette]; \
 [r_vignette][4][5]remap[r_remap]; \
 [l_remap]crop=in_w:1920:0:(in_h-1920)/2[l_rm_crop]; \
 [r_remap]crop=in_w:1920:0:(in_h-1920)/2[r_rm_crop]; \
 [l_rm_crop][alf]alphamerge[l_rm_crop_a]; \
 [l_rm_crop_a]split=2[l_rm_crop1][l_rm_crop2]; \
 [l_rm_crop1]crop=in_w/2:in_h:0:0[l_rm_crop_l]; \
 [l_rm_crop2]crop=in_w/2:in_h:in_w/2:0[l_rm_crop_r]; \
 [0:v][r_rm_crop]overlay=(1920-(2028/2)):0[ov1]; \
 [ov1][l_rm_crop_l]overlay=((1920+2028/2)-(2028-1920)):0[ov2]; \
 [ov2][l_rm_crop_r]overlay=0:0[out]" \
-map [out] -map 0:a "$1_Remapped.mp4"
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When this runs, only one of my CPU is showing any activity.
Is there a way of telling ffmpeg to process these steps in the filter in
parallel?

Kind regards,
Evert Vorster

Isometrix Acquistion Superchief