Update 2025-04-12_09:56:11

ffmpeg_video_compress.sh

@@ -0,0 +1,76 @@
+#!/bin/zsh
+# Script Version: 14
+# Description: Compress a video using ffmpeg with NVIDIA CUDA for acceleration, aiming for a smaller file size. Push GPU usage and CPU multicore hyperthreading to maximize performance by parallel processing.
+
+# Set variables
+# ========
+INPUT_VIDEO="$1"
+OUTPUT_VIDEO="${INPUT_VIDEO%.*}_compressed.mkv"  # Output filename based on input with '_compressed' suffix and .mkv extension
+TEMP_DIR="/tmp/ffmpeg_chunks"
+CHUNK_DURATION=30  # Split video into 30-second chunks for parallel processing
+NUM_CHUNKS=4  # Limit to 4 chunks
+
+# Main Process
+# ========
+if [[ -z "$INPUT_VIDEO" ]]; then
+  echo "Usage: $0 <input_video>"
+  exit 1
+fi
+
+# Check if GNU Parallel is installed
+if ! command -v parallel &> /dev/null; then
+  echo "GNU Parallel is required but not installed. Please install it with: apt-get install parallel"
+  exit 1
+fi
+
+# Create a temporary directory for storing chunks
+mkdir -p "$TEMP_DIR"
+
+# Split the input video into smaller chunks, ensuring proper timestamps and avoiding timestamp issues
+ffmpeg -fflags +genpts -copyts -i "$INPUT_VIDEO" -c copy -map 0 -segment_time "$CHUNK_DURATION" -reset_timestamps 1 -f segment "$TEMP_DIR/chunk_%03d.mkv"
+
+# Verify if splitting succeeded
+if [[ $? -ne 0 ]]; then
+  echo "Error: Failed to split the video into chunks."
+  rm -rf "$TEMP_DIR"
+  exit 1
+fi
+
+# Limit the number of chunks to 4
+CHUNKS=$(ls "$TEMP_DIR"/chunk_*.mkv | head -n "$NUM_CHUNKS")
+
+# Compress each chunk in parallel using GNU Parallel
+echo "$CHUNKS" | parallel -j "$NUM_CHUNKS" ffmpeg -hwaccel cuda -i {} -c:v hevc_nvenc -preset p1 -rc constqp -qp 20 -b:v 5M -maxrate 10M -bufsize 20M -c:a copy {.}_compressed.mkv
+
+# Verify if compression succeeded
+if [[ $? -ne 0 ]]; then
+  echo "Error: Compression failed for one or more chunks."
+  rm -rf "$TEMP_DIR"
+  exit 1
+fi
+
+# Concatenate the compressed chunks into the final output file
+ls "$TEMP_DIR"/*_compressed.mkv | sort | xargs -I {} echo "file '{}'" > "$TEMP_DIR/file_list.txt"
+ffmpeg -f concat -safe 0 -i "$TEMP_DIR/file_list.txt" -c copy "$OUTPUT_VIDEO"
+
+# Verify if concatenation succeeded
+if [[ $? -ne 0 ]]; then
+  echo "Error: Failed to concatenate the compressed chunks."
+  rm -rf "$TEMP_DIR"
+  exit 1
+fi
+
+# Clean up temporary files
+rm -rf "$TEMP_DIR"
+
+# Output status
+if [[ -f "$OUTPUT_VIDEO" ]]; then
+  echo "Compression complete. Output file: $OUTPUT_VIDEO"
+else
+  echo "Compression failed. Output file was not created."
+  exit 1
+fi
+
+# Display file sizes
+ls -lh "$INPUT_VIDEO" "$OUTPUT_VIDEO" | awk '{print $9, $5}'
+