[FFmpeg-user] Speeding up a script.

[Paul B Mahol]

On 8/6/17, Evert Vorster <evorster at gmail.com> wrote:
> Hi there.
> I am using a quite convoluted filter in ffmpeg.
> -------------------------------------------------------------
> #!/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"
> ---------------------------------------------------------
>
> 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?

Have you checked which filter takes most of processing times?

>
> Kind regards,
> Evert Vorster
>
> Isometrix Acquistion Superchief
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