#### SETUP

# Get a recent FFmpeg build with libx264 and libvmaf.
# Source: https://github.com/BtbN/ffmpeg-builds/releases

# Get a high-bitrate reference video.
# Source: https://www.pexels.com/video/scuba-divers-explore-vibrant-coral-reef-33791780/
wget -O water-reference.mp4 "https://www.pexels.com/download/video/33791780/?fps=59.94&h=2160&w=3840"

# Get a low-bitrate reference video.
# Source: https://www.pexels.com/video/burning-firewood-1717998/
wget -O fire-reference.mp4 "https://videos.pexels.com/video-files/1717998/1717998-uhd_3840_2160_25fps.mp4"

# Make a combined water+fire video.
ffmpeg \
-i water-reference.mp4 \
-ss 00:00:18.000 \
-i fire-reference.mp4 \
-filter_complex "[0:v]fps=fps=25[water];[water][1:v]concat=n=2:v=1:a=0[vOut]" \
-map "[vOut]" \
-fps_mode cfr \
-codec:v libx264 \
-qp 0 \
-g 25 \
-bf 0 \
-preset ultrafast \
-an \
-movflags +faststart \
combined-reference.mp4


#### WATER VIDEO

# Encode using CRF mode: VMAF 89.763550
ffmpeg \
-i water-reference.mp4 \
-fps_mode cfr \
-codec:v libx264 \
-profile:v high \
-crf 25 \
-g 300 \
-bf 3 \
-preset fast \
-an \
-movflags +faststart \
water-crf.mp4

ffmpeg \
-i water-crf.mp4 \
-i water-reference.mp4 \
-filter_complex libvmaf='model=version=vmaf_4k_v0.6.1neg:log_path=water-crf.xml' \
-f null \
-

# Encode using CBR mode: VMAF 89.386095
ffmpeg \
-i water-reference.mp4 \
-fps_mode cfr \
-codec:v libx264 \
-profile:v high \
-b:v 46M \
-minrate 46M \
-maxrate 46M \
-bufsize 46M \
-g 300 \
-bf 3 \
-preset fast \
-x264-params "nal-hrd=cbr" \
-an \
-movflags +faststart \
water-cbr.mp4

ffmpeg \
-i water-cbr.mp4 \
-i water-reference.mp4 \
-filter_complex libvmaf='model=version=vmaf_4k_v0.6.1neg:log_path=water-cbr.xml' \
-f null \
-


#### FIRE VIDEO

# Encode using CRF mode: VMAF 98.853343
ffmpeg \
-i fire-reference.mp4 \
-fps_mode cfr \
-codec:v libx264 \
-profile:v high \
-crf 25 \
-g 125 \
-bf 3 \
-preset fast \
-an \
-movflags +faststart \
fire-crf.mp4

ffmpeg \
-i fire-crf.mp4 \
-i fire-reference.mp4 \
-filter_complex libvmaf='model=version=vmaf_4k_v0.6.1neg:log_path=fire-crf.xml' \
-f null \
-

# Encode using CBR mode: VMAF 98.854866
ffmpeg \
-i fire-reference.mp4 \
-fps_mode cfr \
-codec:v libx264 \
-profile:v high \
-b:v 10M \
-minrate 10M \
-maxrate 10M \
-bufsize 10M \
-g 125 \
-bf 3 \
-preset fast \
-x264-params "nal-hrd=cbr" \
-an \
-movflags +faststart \
fire-cbr.mp4

ffmpeg \
-i fire-cbr.mp4 \
-i fire-reference.mp4 \
-filter_complex libvmaf='model=version=vmaf_4k_v0.6.1neg:log_path=fire-cbr.xml' \
-f null \
-


#### COMBINED VIDEO

# Encode using CRF mode: VMAF 96.526387
ffmpeg \
-i combined-reference.mp4 \
-fps_mode cfr \
-codec:v libx264 \
-profile:v high \
-crf 25 \
-g 125 \
-bf 3 \
-preset fast \
-an \
-movflags +faststart \
combined-crf.mp4

ffmpeg \
-i combined-crf.mp4 \
-i combined-reference.mp4 \
-filter_complex libvmaf='model=version=vmaf_4k_v0.6.1neg:log_path=combined-crf.xml' \
-f null \
-

# Encode using CBR mode: VMAF 98.596695
ffmpeg \
-i combined-reference.mp4 \
-fps_mode cfr \
-codec:v libx264 \
-profile:v high \
-b:v 46M \
-minrate 46M \
-maxrate 46M \
-bufsize 46M \
-g 125 \
-bf 3 \
-preset fast \
-x264-params "nal-hrd=cbr" \
-an \
-movflags +faststart \
combined-cbr.mp4

ffmpeg \
-i combined-cbr.mp4 \
-i combined-reference.mp4 \
-filter_complex libvmaf='model=version=vmaf_4k_v0.6.1neg:log_path=combined-cbr.xml' \
-f null \
-