From 03972d23f3410634223025804807f520618d9642 Mon Sep 17 00:00:00 2001
From: Brooke Vibber <bvibber@pobox.com>
Date: Fri, 30 Aug 2024 19:09:29 -0700
Subject: [PATCH] video

---
 video-rickroll/combine.sh | 10 ++++++++++
 video-rickroll/extract.sh | 17 +++++++++++++++++
 video-rickroll/video.sh   | 15 +++++++++++++++
 3 files changed, 42 insertions(+)
 create mode 100644 video-rickroll/combine.sh
 create mode 100644 video-rickroll/extract.sh
 create mode 100644 video-rickroll/video.sh

diff --git a/video-rickroll/combine.sh b/video-rickroll/combine.sh
new file mode 100644
index 0000000..3c833f3
--- /dev/null
+++ b/video-rickroll/combine.sh
@@ -0,0 +1,10 @@
+ffmpeg \
+    -r 60000/1001 \
+    -i 'frames/dither-%04d.png' \
+    -i 'rickroll-audio.wav' \
+    -ac 2 \
+    -ar 48000 \
+    -vf 'pad=w=534,setsar=9/10' \
+    -pix_fmt yuv420p \
+    -movflags +faststart \
+    -y rickroll-dither.mp4
diff --git a/video-rickroll/extract.sh b/video-rickroll/extract.sh
new file mode 100644
index 0000000..115bb1e
--- /dev/null
+++ b/video-rickroll/extract.sh
@@ -0,0 +1,17 @@
+set -a
+
+mkdir -p frames
+
+ffmpeg \
+    -i rickclip.mp4 \
+    -vf 'scale=320:192,framerate=60000/1001' \
+    -an \
+    -y 'frames/rickroll-%04d.png'
+
+ffmpeg \
+    -i rickclip.mp4 \
+    -vn \
+    -ac 1 \
+    -ar 15734 \
+    -acodec pcm_u8 \
+    -y 'rickroll-audio.wav'
diff --git a/video-rickroll/video.sh b/video-rickroll/video.sh
new file mode 100644
index 0000000..4553490
--- /dev/null
+++ b/video-rickroll/video.sh
@@ -0,0 +1,15 @@
+set -e
+
+for frame in frames/rickroll-[0-9][0-9][0-9][0-9].png
+do
+    n="${frame#frames/rickroll-}"
+    n="${n%.png}"
+    out="frames/dither-${n}"
+    last="${n:0-1}"
+    node ../dither-image.js "$frame" "$out" &
+    if (( last == 9 ))
+    then
+        wait
+    fi
+done
+wait