New video clipping script

video/slow-mo-clip.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+
+set -e
+
+# This script allows me to take mp4 files and clip+slow them down for interesting slow mo clips :^)
+# Magic is at the bottom the rest is just interfacing
+
+
+if [ -z "$3" ]; then
+        cat <<- EOF
+        Usage: slow-mo.sh /path/to/file.mp4 HH:MM:SS[.ms] HH:MM:SS[.ms]
+        Note:
+            .ms (miliseconds) optional as they are not required to make this script work but
+            ffmpeg does understand the field
+
+        Alternative flags( environment variables ):
+            REMOVE_AUDIO
+                    When this is set the audio output is disabled
+                SLOW_RATE
+                    2.0 => Half speed
+            3.0 => 3x slower
+            Formula is 1 / RATE => OutputRate
+        EOF
+        exit 0
+fi
+
+# If this gets set then we do not create the first clip with audio
+case "$REMOVE_AUDIO" in
+        true)
+                echo "Audio: DISABLED"
+                FFMPEG_COPY="-c copy -an"
+                ;;
+        *)
+                echo "Audio: ENABLED"
+                FFMPEG_COPY="-c:v copy"
+                ;;
+esac
+
+# Aliasing input variables
+input="$1"
+starttime="$2"
+endtime="$3"
+
+SLOW_RATE=2.0
+# Make ffmpeg be quiet
+LOG="-loglevel error"
+
+clip="$input-clip.mp4"
+
+echo "Cutting desired section from $2 to $3..."
+ffmpeg $LOG -y -i "$input" -ss "$starttime" -to "$endtime" $FFMPEG_COPY "$clip"
+
+echo "Slowing down video now"
+ffmpeg $LOG -y -i "$clip" -vf "setpts=$SLOW_RATE*PTS" "$input.slow.mp4"
+