#!/bin/bash

INPUT="$HOME/mount/Ripping/Lutz/noch zu rendern/Brücke nach Terabithia/A1_t00.mkv"
OTPUT="${INPUT%.*}_deinterlaced_vaapi.mp4"
TEMP_STATS=$(mktemp)

ffmpeg -filter:v idet -frames:v 5000 -an -f rawvideo -y /dev/null -i "$INPUT" 2> "$TEMP_STATS"

SUMMARY_LINE=$(grep "Multi frame detection" "$TEMP_STATS")

# Extract counts allowing for leading spaces
TFF_COUNT=$(echo "$SUMMARY_LINE" | grep -oP 'TFF:\s*\K[0-9]+' || echo 0)
BFF_COUNT=$(echo "$SUMMARY_LINE" | grep -oP 'BFF:\s*\K[0-9]+' || echo 0)
PROG_COUNT=$(echo "$SUMMARY_LINE" | grep -oP 'Progressive:\s*\K[0-9]+' || echo 0)

rm "$TEMP_STATS"

echo "Detected: TFF=$TFF_COUNT, BFF=$BFF_COUNT, Progressive=$PROG_COUNT"

TOTAL_INTERLACED=$((TFF_COUNT + BFF_COUNT))

if [ "$TOTAL_INTERLACED" -lt 100 ]; then
  echo "Video is mostly progressive. No deinterlacing needed."
  exit 0
fi

echo "Deinterlacing required."

ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi \
  -i "$INPUT" \
  -vf 'format=nv12,hwupload,deinterlace_vaapi' \U
  -c:v h264_vaapi -b:v 5M -c:a copy "$OUTPUT"