Cut a video file from frame.io comments.

cut_segments.sh

#!/bin/bash

# Run with:
# bash <(curl -sL "https://gist.githubusercontent.com/krasi-georgiev/1f167a2136bbce5824c6516d2777ef79/raw/cut_segments.sh")

shopt -s nullglob

### STEP 1: Select CSV file
csv_files=( *.csv )
if [ ${#csv_files[@]} -eq 0 ]; then
  echo "❌ No CSV files found."
  exit 1
fi

if [ -t 0 ]; then
  echo "Available CSV files:"
  select csv_file in "${csv_files[@]}"; do
    [[ -n "$csv_file" ]] && break
    echo "❌ Invalid selection. Try again."
  done
else
  csv_file="${csv_files[0]}"
  echo "ℹ️  Auto-selected CSV: $csv_file"
fi

### STEP 2: Select MP4 file
mp4_files=( *.mp4 )
if [ ${#mp4_files[@]} -eq 0 ]; then
  echo "❌ No MP4 files found."
  exit 1
fi

IFS=$'\n' mp4_files=( $(ls -S *.mp4) )

if [ -t 0 ]; then
  echo "Available MP4 files (sorted by size):"
  select video_file in "${mp4_files[@]}"; do
    [[ -n "$video_file" ]] && break
    echo "❌ Invalid selection. Try again."
  done
else
  video_file="${mp4_files[0]}"
  echo "ℹ️  Auto-selected MP4: $video_file"
fi

### STEP 3: Detect FPS
FPS=$(ffprobe -v 0 -of csv=p=0 -select_streams v:0 -show_entries stream=r_frame_rate "$video_file" | bc -l)
if [[ -z "$FPS" || "$FPS" == "0" ]]; then
  echo "❌ Could not detect FPS from video."
  exit 1
fi
echo "🎞 Detected FPS: $FPS"

### STEP 4: Extract Frame column (14)
echo "📋 Parsing frames from column 14..."
mapfile -t frames < <(
  tail -n +2 "$csv_file" | awk -F',' '
    {
      gsub(/^"|"$/, "", $14)
      if ($14 ~ /^[0-9]+$/) print $14
    }
  '
)

### STEP 5: Process in pairs
total_pairs=$(( ${#frames[@]} / 2 ))
echo "🎬 Cutting $total_pairs segments from ${#frames[@]} frame entries..."

for (( i=0; i<${#frames[@]}-1; i+=2 )); do
  start_frame="${frames[$i]}"
  end_frame="${frames[$((i+1))]}"

  if (( end_frame <= start_frame )); then
    echo "❌ Error: Invalid segment. End frame ($end_frame) <= Start frame ($start_frame)"
    exit 1
  fi

  start_sec=$(bc <<< "scale=6; $start_frame / $FPS")
  end_sec=$(bc <<< "scale=6; $end_frame / $FPS")
  output_file="segment_${start_frame}_to_${end_frame}.mp4"

  echo "⏱ Cutting: frame $start_frame ($start_sec s) → $end_frame ($end_sec s)"
  echo "📁 Output: $output_file"

  ffmpeg -hide_banner -loglevel error -y \
    -ss "$start_sec" -to "$end_sec" \
    -i "$video_file" -c copy "$output_file"

  if [ $? -eq 0 ]; then
    echo "✅ Created: $output_file"
  else
    echo "❌ Failed: $output_file"
  fi
done