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A benchmark of ffmpeg libx264 encoding with a range of CRF and presets
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#!/bin/bash | |
infile="Test-15s.mov" | |
datafile="Test-15s.csv" | |
crfs=("18" "19" "20" "21" "22" "23" "24" "25" "26" "27") | |
presets=("ultrafast" "superfast" "veryfast" "faster" "fast" "medium" "slow" "slower" "veryslow") | |
echo 'CRF,Preset,Time (Secs),Size (MB)' >> "$datafile" | |
for crf in "${crfs[@]}"; do | |
for preset in "${presets[@]}"; do | |
outfile=Out_CRF_"$crf"_Preset_"$preset".mp4 | |
time_start=$(date +%s) | |
ffmpeg -i "$infile" -map 0 -c copy -c:v libx264 -crf "$crf" -preset "$preset" "$outfile" | |
time_end=$(date +%s) | |
# Dividing by 1 forces the scale to be used. | |
time=$(echo "scale = 2; ($time_end - $time_start)/1" | bc) | |
size_bytes=$(ls -l "$outfile" | awk '{ print $5 }') | |
size_mb=$(echo "scale = 2; $size_bytes / 1000000" | bc) | |
echo $crf,$preset,$time,$size_mb >> "$datafile" | |
done | |
done |
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chmod 700 ffmpeg-libx264
./ffmpeg-libx264