png2mp4 fun

Signed-off-by: Balazs Horvath <acsipont@gmail.com>

zsh/png2mp4.zsh

@@ -27,6 +27,8 @@ png2mp4_x265() {
     conda deactivate
     local step_multiplier=1
     local repeat=1
+    local frame_rate=60
+    local resolution="1024x1024"
 
     while [[ "$#" -gt 0 ]]; do
         case $1 in
@@ -39,29 +41,27 @@ png2mp4_x265() {
     output_filename="$(basename "$(pwd)")_x265.mp4"
     echo "Output filename: $output_filename"
 
-
     local nframes=$(find . -type f -name '*.png' | wc -l)
-    local duration=$(($nframes * $repeat / 60.))
+    local duration=$(($nframes * $repeat / ${frame_rate}.))
     local fade_start=$((duration + 3))
     echo "Found $nframes for a duration of $duration seconds"
 
-
     echo "Running ffmpeg with x265 encoding..."
     local font=/usr/share/fonts/TTF/Inconsolata-Light.ttf
     local drawtext="drawtext=fontfile=${font}:text='Steps\: %{eif\\:trunc(n*$step_multiplier)\\:u\\:3}':x=10:y=h-th-10:fontsize=24:fontcolor=white"
     local fadeout="tpad=stop_mode=clone:stop_duration=8,fade=t=out:st=${fade_start}:d=5"
-    local output_preset=(
-        -c:v libx265
-        -preset slower -tune animation
-        -g $repeat
+    local encoder=(
         -pix_fmt yuv420p
-        -x265-params "crf=20:qcomp=0.8:aq-mode=3:aq-strength=0.8:deblock=-1,-1"
+        -c:v libx265
+        -preset slower
+        -tune animation
+        -crf 22
+        -x265-params "keyint=${repeat}:min-keyint=$((repeat-1)):scenecut=0:ref=5:bframes=8:b-adapt=2:rc-lookahead=$((2*repeat)):lookahead-slices=4:aq-mode=3:aq-strength=0.8:deblock=-1,-1:sao=0"
     )
 
-    ffmpeg -framerate "60/$repeat" -pattern_type glob -i "*.png" -r 60 -vf "scale=1024x1024,${drawtext},${fadeout}"\
-        -c:v ffv1 -f matroska - | ffmpeg -f matroska -i - \
-        -vf "$fadeout" "${output_preset[@]}" -y output.mp4
-
+    ffmpeg -framerate "$frame_rate/$repeat" -pattern_type glob -i "*.png" \
+        -vf "scale=${resolution},${drawtext},fps=${frame_rate},${fadeout}" \
+        "${encoder[@]}" -y sample_x265.mp4
     if [ $? -ne 0 ]; then
         echo "Error: ffmpeg command failed."
         return 1