Example script to encode video from a Decklink Mini Recorder using h264_qsv

ffmpeg_decklink_h264_qsv.sh

#!/bin/sh

cat << EOF > test.filter-script
[0:v]kerndeint,format=pix_fmts=nv12,split=2[split1-1][split1-2];
[split1-1]scale=-2:720,split=3[scale-720-1][scale-720-2][scale-720-3];
[split1-2]scale=-2:540,split=2[scale-540-1][scale-540-2];
[scale-720-1]fps=1/60[stills-1];
[0:a]asplit=4[audio-1][audio-2][audio-3][audio-4]
EOF

/usr/bin/ffmpeg \
    -probesize 10000k \
    -r 30000/1001 \
    -f decklink -i 'DeckLink Mini Recorder (1)@11' -y \
    -filter_complex_script test.filter-script \
    -map '[scale-720-2]' -map '[audio-1]' \
    -pix_fmt yuv420p \
    -c:v h264_qsv -profile:v baseline -preset veryfast \
    -b:v 2200k -minrate 2200k -maxrate 2200k \
    -c:a aac -ac 2 -b:a 192k -ar 44100 \
    -flags +global_header 'test-high.mp4' \
    -map '[stills-1]' \
    -updatefirst 1 \
    -qscale:v 10 \
    'test-still.jpg' \
    -map '[scale-720-3]' -map '[audio-2]' \
    -pix_fmt yuv420p \
    -c:v h264_qsv -profile:v baseline -preset veryfast \
    -b:v 4000k -minrate 4000k -maxrate 4000k \
    -c:a aac -ac 2 -b:a 320k -ar 44100 \
    -flags +global_header 'test-super.mp4' \
    -map '[scale-540-1]' -map '[audio-3]' \
    -pix_fmt yuv420p \
    -c:v h264_qsv -profile:v baseline -preset veryfast \
    -b:v 1280k -minrate 1280k -maxrate 1280k \
    -c:a aac -ac 2 -b:a 160k -ar 44100 \
    -flags +global_header 'test-medium.mp4' \
    -map '[scale-540-2]' -map '[audio-4]' \
    -pix_fmt yuv420p \
    -c:v h264_qsv -profile:v baseline -preset veryfast \
    -b:v 416k -minrate 416k -maxrate 416k \
    -c:a aac -ac 2 -b:a 96k -ar 44100 \
    -flags +global_header 'test-low.mp4'