diff --git a/src-lib/Cargo.lock b/src-lib/Cargo.lock
new file mode 100644
index 0000000..1d866bc
--- /dev/null
+++ b/src-lib/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "src-lib"
+version = "0.1.0"
diff --git a/src-lib/testdata/poc.sh b/src-lib/testdata/poc.sh
new file mode 100644
index 0000000..3072d3f
--- /dev/null
+++ b/src-lib/testdata/poc.sh
@@ -0,0 +1,58 @@
+#! /bin/bash
+
+py="$(cat <<EOF
+from sys import stdin; lines = [i.strip() for i in stdin.readlines()];
+def keyword(line):
+  return "keep" if "keep" in line else "drop"
+somelines = lines[:1]
+for i in range(1, len(lines)):
+  if keyword(somelines[-1]) != keyword(lines[i]):
+    somelines.append(lines[i-1])
+    somelines.append(lines[i])
+somelines = [(keyword(i), i.split("pts_time:")[1].split()[0]) for i in somelines]
+
+# just the keeps
+somelines = [i for i in somelines[2:] if i[0] == "keep"]
+
+# translate to floats
+drops = []
+for i in range(0, len(somelines), 2):
+   start = float(somelines[i][1])
+   if len(somelines) > i+1:
+      stop = float(somelines[i+1][1])
+      if stop - start > 1:
+         drops.append((start, stop))
+   #else:
+   #   drops.append((start, "inf"))
+
+# extend around
+for i in range(len(drops)):
+   drops[i] = (drops[i][0] - 1.0, drops[i][1] + 1.0)
+
+# combine near
+for i in range(len(drops)-1, 0, -1):
+   first_start, first_stop = drops[i-1]
+   secnd_start, secnd_stop = drops[i]
+   if secnd_start - first_stop < 5:
+      drops = drops[:i-1] + [(first_start, secnd_stop)] + drops[i+1:]
+
+# output
+print("\n".join([
+   f'{i[0]:.2f},{i[1]-i[0]:.2f}' for i in drops
+]))
+EOF
+)"
+
+d=$(mktemp -d)
+echo d=$d >&2
+for span in $(
+   ffmpeg -i $f -vf mpdecimate -loglevel debug -f null - 2>&1 \
+   | grep Parsed_mpdecimate_0 \
+   | grep -E ' (keep|drop) ' \
+   | python3 -c "$py"
+); do
+   n=$((n+1))
+   ffmpeg -y -ss ${span%,*} -i "$f" -t ${span#*,} "$d/$(printf "%05d" $(ls "$d" | wc -l)).${f##*.}"
+done
+ls $d
+echo rm -rf "$d"
diff --git a/src-lib/testdata/stackoverflow.sh b/src-lib/testdata/stackoverflow.sh
new file mode 100644
index 0000000..96ba98e
--- /dev/null
+++ b/src-lib/testdata/stackoverflow.sh
@@ -0,0 +1,39 @@
+#! /bin/bash
+
+set -euo pipefail
+f="${1:-"/Users/breel/Movies/bel_1_1.mp4"}"
+g="$f.2.${f##*.}"
+
+echo ffmpeg -i "$f" -vf mpdecimate -loglevel debug -f null -
+echo ffmpeg -y -i "$f" -vf mpdecimate=hi=16:lo=16:frac=1:max=1000 -vsync vfr $g
+
+# https://stackoverflow.com/questions/62648760/use-debug-log-from-ffmpeg-mpdecimate-to-remove-frames-of-another-input-file
+
+echo ffmpeg -i "$f" -vf "split=2[full][crop];[crop]mpdecimate=hi=16:lo=16:frac=1:max=1000[crop];[crop][full]overlay" "$g"
+
+if [ ! -f ./mpdecimate_trim.py ]; then
+   wget -O ./mpdecimate_trim.py https://github.com/KenjiTakahashi/mpdecimate_trim/raw/master/mpdecimate_trim.py
+fi
+echo cp "$f" "$g"
+echo python3 "./mpdecimate_trim.py" "$g"
+
+# https://superuser.com/questions/984841/ffmpeg-remove-parts-without-motion
+
+echo ffmpeg -y -i "$f" -vf "select=gt(scene\,0.003),setpts=N/(25*TB)" "$g"
+
+# https://stackoverflow.com/questions/35675529/using-ffmpeg-how-to-do-a-scene-change-detection-with-timecode
+
+echo 'ffmpeg -y -i "$f" -filter:v "select='gt(scene,0.50)',showinfo" -f null - 2>&1 | grep showinfo | grep pts_time:[0-9.]* -o | grep [0-9.]* -o'
+
+# https://stackoverflow.com/questions/40966394/how-to-simply-remove-duplicate-frames-from-a-video-using-ffmpeg
+
+#ffmpeg -y -i "$f" -vsync cfr "$g".tmp.${f##*.}
+#ffmpeg -y -i "$g".tmp.${f##*.} -vf "select='if(gt(scene,0.003),st(1,t),lte(t-ld(1),1))',setpts=N/FRAME_RATE/TB" "$g"
+#rm "$g".tmp.${f##*.}
+
+# https://stackoverflow.com/questions/37088517/remove-sequentially-duplicate-frames-when-using-ffmpeg
+
+# ffmpeg -i $f -vf mpdecimate -loglevel debug -f null - 2>&1 | grep Parsed_mpdecimate_0 | grep ' keep '
+# ffmpeg -i input.mp4 -vf mpdecimate,setpts=N/FRAME_RATE/TB out.mp4
+# ffmpeg -i "$f" -vf "split=2[full][crop];[crop]mpdecimate=hi=16:lo=16:frac=1:max=1000[crop];[crop][full]overlay" "$g"
+ffmpeg -y -i "$f" -vf "split=2[full][crop];[crop]mpdecimate,setpts=N/FRAME_RATE/TB[crop];[crop][full]overlay" "$g"