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