ariunbayar · March 26, 2025 18:49
diff --git a/merge_by_date.sh b/merge_by_date.sh
 #!/bin/bash

 # --- Configuration ---
 # Video encoding options (same as your example)
 VCODEC="libx264"
 CRF="23"
 PRESET="medium"
 ACODEC="aac"
 ABITRATE="192k"
 OUTPUT_EXT="mp4" # Output container format extension

 # Directory to move processed source files
 PROCESSED_DIR="processed"

 # --- Script Logic ---

 # Create the target directory for processed files if it doesn't exist
 mkdir -p "$PROCESSED_DIR"
 if [ ! -d "$PROCESSED_DIR" ]; then
    echo "Error: Could not create directory '$PROCESSED_DIR'."
    exit 1
 fi

 echo "Scanning for unique dates in MPG filenames..."

 # Find unique dates (YYYY-MM-DD) from filenames matching the pattern
 # Using find for safety, extracting date with cut, sorting uniquely
 # Using process substitution and mapfile (or readarray) to store dates.
 mapfile -t unique_dates < <(find . -maxdepth 1 -name '????-??-??_????_M*.MPG' -printf '%f\n' | cut -c1-10 | sort -u)

 # Check if any dates were found
 if [ ${#unique_dates[@]} -eq 0 ]; then
    echo "No MPG files found matching the pattern YYYY-MM-DD_HHMM_M*.MPG in the current directory."
    exit 0
 fi

 echo "Found dates to process: ${unique_dates[*]}"
 echo "Starting processing..."
 echo "--------------------"

 # Loop through each unique date
 for date in "${unique_dates[@]}"; do
    echo "Processing date: $date"

    # Find and sort all .MPG files for the current date
    # Using find for safety and storing results in an array using mapfile
    mapfile -t files_for_date < <(find . -maxdepth 1 -name "${date}_????_M*.MPG" -printf '%f\n' | sort)

    # Check if files were actually found for this date (should always be true here, but good practice)
    if [ ${#files_for_date[@]} -eq 0 ]; then
        echo "  Warning: No files found for date $date during processing loop (unexpected)."
        continue
    fi

    echo "  Files found for $date: ${files_for_date[*]}"

    # Construct the ffmpeg concat input string (e.g., file1.MPG|file2.MPG)
    # Using IFS and array expansion for safe joining
    input_concat_string=$(IFS='|'; echo "${files_for_date[*]}")

    # Determine the output filename: Use the date and the timestamp from the *first* sorted file
    # Removes the _M* part and changes extension, e.g., 2014-09-08_0907.mp4
    first_file_basename="${files_for_date[0]}"
    # Using sed to replace the last underscore segment and extension
    output_name=$(echo "$first_file_basename" | sed "s/_[^_]*\.MPG$/.${OUTPUT_EXT}/")

    echo "  Output file will be: $output_name"

    # Check if output file already exists to prevent accidental overwrite or re-processing
    if [ -f "$output_name" ]; then
        echo "  SKIPPING: Output file '$output_name' already exists."
        # Optional: Decide if you want to move source files even if output exists
        # echo "  Moving source files for skipped date..."
        # for file in "${files_for_date[@]}"; do mv -- "$file" "$PROCESSED_DIR/"; done
        echo "--------------------"
        continue
    fi

    # Prepare the ffmpeg command arguments in an array for robustness
    ffmpeg_cmd=(
        ffmpeg
        -i "concat:$input_concat_string"
        -c:v "$VCODEC"
        -crf "$CRF"
        -preset "$PRESET"
        -c:a "$ACODEC"
        -b:a "$ABITRATE"
        # Optional: Add -map 0 if you encounter channel mapping issues
        "$output_name"
    )

    echo "  Executing FFmpeg..."
    # Use "${ffmpeg_cmd[@]}" to correctly handle arguments with spaces if any
    if "${ffmpeg_cmd[@]}"; then
        echo "  SUCCESS: FFmpeg finished for $date."
        echo "  Moving original files to '$PROCESSED_DIR/'..."
        # Move source files to the 'processed' directory *only on success*
        for file in "${files_for_date[@]}"; do
            # Use -- to handle filenames that might start with a dash
            mv -- "$file" "$PROCESSED_DIR/"
        done
        echo "  Moved ${#files_for_date[@]} files for $date."
    else
        echo "  FAILURE: FFmpeg failed for $date. Original files were NOT moved."
        # Optional: You might want to delete the potentially incomplete output file on failure
        # rm -f "$output_name"
    fi
    echo "--------------------"
 done

 echo "All processing finished."
	#!/bin/bash

	# --- Configuration ---
	# Video encoding options (same as your example)
	VCODEC="libx264"
	CRF="23"
	PRESET="medium"
	ACODEC="aac"
	ABITRATE="192k"
	OUTPUT_EXT="mp4" # Output container format extension

	# Directory to move processed source files
	PROCESSED_DIR="processed"

	# --- Script Logic ---

	# Create the target directory for processed files if it doesn't exist
	mkdir -p "$PROCESSED_DIR"
	if [ ! -d "$PROCESSED_DIR" ]; then
	echo "Error: Could not create directory '$PROCESSED_DIR'."
	exit 1
	fi

	echo "Scanning for unique dates in MPG filenames..."

	# Find unique dates (YYYY-MM-DD) from filenames matching the pattern
	# Using find for safety, extracting date with cut, sorting uniquely
	# Using process substitution and mapfile (or readarray) to store dates.
	mapfile -t unique_dates < <(find . -maxdepth 1 -name '????-??-??_????_M*.MPG' -printf '%f\n' \| cut -c1-10 \| sort -u)

	# Check if any dates were found
	if [ ${#unique_dates[@]} -eq 0 ]; then
	echo "No MPG files found matching the pattern YYYY-MM-DD_HHMM_M*.MPG in the current directory."
	exit 0
	fi

	echo "Found dates to process: ${unique_dates[*]}"
	echo "Starting processing..."
	echo "--------------------"

	# Loop through each unique date
	for date in "${unique_dates[@]}"; do
	echo "Processing date: $date"

	# Find and sort all .MPG files for the current date
	# Using find for safety and storing results in an array using mapfile
	mapfile -t files_for_date < <(find . -maxdepth 1 -name "${date}_????_M*.MPG" -printf '%f\n' \| sort)

	# Check if files were actually found for this date (should always be true here, but good practice)
	if [ ${#files_for_date[@]} -eq 0 ]; then
	echo " Warning: No files found for date $date during processing loop (unexpected)."
	continue
	fi

	echo " Files found for $date: ${files_for_date[*]}"

	# Construct the ffmpeg concat input string (e.g., file1.MPG\|file2.MPG)
	# Using IFS and array expansion for safe joining
	input_concat_string=$(IFS='\|'; echo "${files_for_date[*]}")

	# Determine the output filename: Use the date and the timestamp from the first sorted file
	# Removes the _M* part and changes extension, e.g., 2014-09-08_0907.mp4
	first_file_basename="${files_for_date[0]}"
	# Using sed to replace the last underscore segment and extension
	output_name=$(echo "$first_file_basename" \| sed "s/_[^_]*\.MPG$/.${OUTPUT_EXT}/")

	echo " Output file will be: $output_name"

	# Check if output file already exists to prevent accidental overwrite or re-processing
	if [ -f "$output_name" ]; then
	echo " SKIPPING: Output file '$output_name' already exists."
	# Optional: Decide if you want to move source files even if output exists
	# echo " Moving source files for skipped date..."
	# for file in "${files_for_date[@]}"; do mv -- "$file" "$PROCESSED_DIR/"; done
	echo "--------------------"
	continue
	fi

	# Prepare the ffmpeg command arguments in an array for robustness
	ffmpeg_cmd=(
	ffmpeg
	-i "concat:$input_concat_string"
	-c:v "$VCODEC"
	-crf "$CRF"
	-preset "$PRESET"
	-c:a "$ACODEC"
	-b:a "$ABITRATE"
	# Optional: Add -map 0 if you encounter channel mapping issues
	"$output_name"
	)

	echo " Executing FFmpeg..."
	# Use "${ffmpeg_cmd[@]}" to correctly handle arguments with spaces if any
	if "${ffmpeg_cmd[@]}"; then
	echo " SUCCESS: FFmpeg finished for $date."
	echo " Moving original files to '$PROCESSED_DIR/'..."
	# Move source files to the 'processed' directory only on success
	for file in "${files_for_date[@]}"; do
	# Use -- to handle filenames that might start with a dash
	mv -- "$file" "$PROCESSED_DIR/"
	done
	echo " Moved ${#files_for_date[@]} files for $date."
	else
	echo " FAILURE: FFmpeg failed for $date. Original files were NOT moved."
	# Optional: You might want to delete the potentially incomplete output file on failure
	# rm -f "$output_name"
	fi
	echo "--------------------"
	done

	echo "All processing finished."
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