BGB-TV Bash FFmpeg script to generate CRT-stylized output from raw AVI and WAV files from BGB

bgb-tv.sh

#!/bin/bash

# A collection of FFmpeg filterchains which can be used to create a stylised
# 'CRT screen' effect on given input, specialized for raw AVI and WAV output 
# from BGB Gameboy emulator.
#
# Includes basic demonstration FFmpeg command which takes "$1" input
# of video and audio files without extensions
#
# Requires:
#  -FFmpeg compiled with Lensfun
#
# Version: 20210104DM
# Original source https://oioiiooixiii.blogspot.com
# Modifications made by DEFENSE MECHANISM https://defensemech.com

### FILTERCHAINS ###############################################################

# Add noise to each frame of input
noiseFX="noise=c0s=16:allf=t"

# Scale Gameboy
resize="scale=-1:720:flags=neighbor"

# Create RGB chromatic aberration
rgbFX="split=3[r][g][b];
        nullsrc=size=800x720[base1];
        nullsrc=size=800x720[base2];
        nullsrc=size=800x720[base3];
        [r]lutrgb=g=0:b=0[red];
        [g]lutrgb=r=0:b=0[green];
        [b]lutrgb=r=0:g=0[blue];
        [base1][red]overlay=x=-2:shortest=1,format=rgb24[x];
        [base2][green]overlay=x=0:shortest=1,format=rgb24[y];
        [base3][blue]overlay=x=2:shortest=1,format=rgb24[z];
        [x][z]blend=all_mode='addition'[xz];
        [xz][y]blend=all_mode='addition',
        format=gbrp"

# Create YUV chromatic aberration
yuvFX="split=3[y][u][v];
        nullsrc=size=800x720[base1];
        nullsrc=size=800x720[base2];
        nullsrc=size=800x720[base3];
        [y]lutyuv=u=0:v=0[Yaxis];
        [u]lutyuv=v=0:y=0[Uaxis];
        [v]lutyuv=u=0:y=0[Vaxis];
        [base1][Yaxis]overlay=x=1:shortest=1[a];
        [base2][Uaxis]overlay=x=0:shortest=1[b];
        [base3][Vaxis]overlay=x=-1:shortest=1[c];
        [a][c]blend=all_mode='lighten'[ac];
        [ac][b]blend=all_mode='lighten',
        crop=790:720"

# Add interlaced fields effect to input
interlaceFX="scale=-1:360,
             split[a][b];
             [a] eq=brightness=-0.3 [a];
             [b] eq=saturation=1.5 [b];
             [a][b] blend=all_expr='if(eq(0,mod(Y,2)+eq(0,Y)),B,A)':shortest=1,
             scale=-1:720"

# Brighten center of screen
brighten="[base];
             nullsrc=size=790x720:rate=60,
                drawtext=
                   fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf:
                   text='@':
                   x=320:
                   y=270:
                   fontsize=270:
                   [email protected],
             boxblur=160 [gauss];
             [gauss][base] blend=all_mode=screen:shortest=1"

# Curve input to mimic curve of crt screen
curveImage="
            format=gbrp,
            lensfun=
            make=Canon:
            model='Canon EOS 100D':
            lens_model='Canon EF-S 18-55mm f/3.5-5.6 IS STM':
            scale=1.02:
            target_geometry=fisheye_stereographic:
            interpolation=lanczos"

# Pad video to center
pad="scale=-1:720,pad=1280:720:180:0"

# Add bloom effect to input [crt screen]
bloomEffect="split [a][b];
             [b] boxblur=12,
                    format=gbrp [b];
             [b][a] blend=all_mode=screen:shortest=1"
             
### FFMPEG COMMAND #############################################################
VIDEO=$(ls | egrep "^$1.*mp4|^$1.*avi$|^$1.*mkv$" | head -n 1)
if [[ -f "$1wav" ]]; then
ffmpeg -hwaccel cuvid \
   -i "$1wav" -r 60 -i "$1avi" -vcodec h264_nvenc \
   -vf " ${noiseFX},
         ${resize},
         ${rgbFX},
         ${yuvFX},
         ${interlaceFX}
         ${brighten},
         ${curveImage},
         ${pad},
         ${bloomEffect}
      " -b:a 384k -pix_fmt yuv420p -r 40 -preset slow ${1}_tv.mp4 -y
    elif [[ -f "$VIDEO" ]]; then
ffmpeg -hwaccel cuvid \
   -r 60 -i "$VIDEO" -vcodec h264_nvenc \
   -vf " ${noiseFX},
         ${resize},
         ${rgbFX},
         ${yuvFX},
         ${interlaceFX}
         ${brighten},
         ${curveImage},
         ${pad},
         ${bloomEffect}
      " -pix_fmt yuv420p -r 40 -preset slow ${VIDEO}_tv.mp4 -y
    else
      echo "Please provide a filename without extension"
fi
exit 0