estimate fg

scripts/estimate_fg.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+
+get_duration() {
+    ffmpeg -i "$1" 2>&1 | grep "Duration" | awk '{print $2}' | tr -d ,
+}
+
+INPUT="bebop.mkv"
+
+DURATION="$(get_duration "$INPUT")"
+TOTAL_SECONDS="$(echo "$DURATION" | awk -F: '{ print ($1 * 3600) + ($2 * 60) + $3 }')"
+echo "TOTAL_SECONDS: $TOTAL_SECONDS"
+
+# set number of segments and start times
+SEGMENTS=9
+SEGMENT_PERCENTAGE=$((100 / SEGMENTS))
+SEGMENT=$SEGMENT_PERCENTAGE
+START_TIMES=()
+while [[ $SEGMENT -lt 100 ]]
+do
+    START_TIME="$(echo "$SEGMENT * $TOTAL_SECONDS / 100" | bc)"
+    START_TIMES+=("$START_TIME")
+    SEGMENT=$((SEGMENT + SEGMENT_PERCENTAGE))
+done
+
+# split up video into segments based on start times
+SEGMENT_TIME=1
+SEGMENT_DIR='./tmp/fg_segments'
+SEGMENTS_LIST="$SEGMENT_DIR/segments_list.txt"
+OUTPUT_CONCAT="$SEGMENT_DIR/concatenated.mkv"
+rm -rf "$SEGMENT_DIR"
+mkdir -p "$SEGMENT_DIR"
+for INDEX in "${!START_TIMES[@]}"
+do
+    # don't concatenate the last segment
+    if [[ $((INDEX + 1)) == "${#START_TIMES[@]}" ]]; then
+        break
+    fi
+    START_TIME="${START_TIMES[$INDEX]}"
+    OUTPUT_SEGMENT="$SEGMENT_DIR/segment_$INDEX.mkv"
+    echo "START_TIME: $START_TIME"
+    ffmpeg -ss "$START_TIME" -i "$INPUT" -hide_banner -loglevel error -t "$SEGMENT_TIME" -map 0:0 -c copy "$OUTPUT_SEGMENT"
+    echo "file '$(basename "$OUTPUT_SEGMENT")'" >> "$SEGMENTS_LIST"
+done
+
+ffmpeg -f concat -safe 0 -i "$SEGMENTS_LIST" -hide_banner -loglevel error -c copy "$OUTPUT_CONCAT"