add nvenc-compress package

global/nvenc_compress.sh

@@ -0,0 +1,87 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Usage: nvenc_compress.sh <video_path> [target_size_mb]
+
+VIDEO="$1"
+TARGET_MB="${2:-9}"
+TARGET_BYTES=$((TARGET_MB * 1024 * 1024))
+
+if [[ ! -f "$VIDEO" ]]; then
+  echo "Error: file not found: $VIDEO"
+  exit 1
+fi
+
+BASENAME="${VIDEO##*/}"
+BASENAME="${BASENAME%.*}"
+OUTDIR="$(dirname "$VIDEO")"
+OUTFILE="$OUTDIR/${BASENAME}_compressed.mp4"
+
+# nvenc cq range: 0 (best/largest) to 51 (worst/smallest)
+# We binary search this range to hit the target file size
+LO=0
+HI=51
+BEST_DIFF=999999999
+BEST_CQ=23
+MAX_ITERATIONS=20
+
+echo "Target size: ${TARGET_MB}MB (${TARGET_BYTES} bytes)"
+echo "Encoding with nvenc (h264_nvenc)..."
+echo ""
+
+for ((i=0; i<MAX_ITERATIONS; i++)); do
+  CQ=$(( (LO + HI) / 2 ))
+  TMPFILE="${OUTFILE}_iter_${i}_cq${CQ}.mp4"
+
+  echo "--- Iteration $((i+1))/$MAX_ITERATIONS ---"
+  echo "Trying cq=$CQ (lo=$LO, hi=$HI)"
+
+  ffmpeg -y -i "$VIDEO" -c:v h264_nvenc -cq "$CQ" -c:a copy -preset p7 -f mp4 "$TMPFILE" 2>/dev/null
+
+  if [[ ! -f "$TMPFILE" ]]; then
+    echo "Error: ffmpeg failed at cq=$CQ"
+    rm -f "$TMPFILE"
+    break
+  fi
+
+  FILE_SIZE=$(stat -c%s "$TMPFILE" 2>/dev/null || stat -f%z "$TMPFILE" 2>/dev/null)
+  DIFF=$(( FILE_SIZE - TARGET_BYTES ))
+  ABS_DIFF=${DIFF#-}
+
+  echo "  Size: $(( FILE_SIZE / 1024 / 1024 ))MB (diff: $(( DIFF / 1024 / 1024 ))MB)"
+
+  if (( ABS_DIFF < BEST_DIFF )); then
+    BEST_DIFF=$ABS_DIFF
+    BEST_CQ=$CQ
+    cp "$TMPFILE" "$OUTFILE"
+  fi
+
+  rm -f "$TMPFILE"
+
+  # If within 1% of target, we're close enough
+  if (( ABS_DIFF < TARGET_BYTES / 100 )); then
+    echo ""
+    echo "Within tolerance! Stopping."
+    break
+  fi
+
+  # Binary search direction:
+  # Higher cq = smaller file, lower cq = larger file
+  if (( FILE_SIZE > TARGET_BYTES )); then
+    # File too big, need higher cq (smaller)
+    LO=$(( CQ + 1 ))
+  else
+    # File too small, need lower cq (larger)
+    HI=$(( CQ - 1 ))
+  fi
+
+  if (( LO > HI )); then
+    echo ""
+    echo "Range exhausted. Stopping."
+    break
+  fi
+done
+
+echo ""
+echo "Done! Best cq=$BEST_CQ, final size: $(( BEST_DIFF / 1024 / 1024 ))MB from target"
+echo "Output: $OUTFILE"