41 lines
1.5 KiB
Python
Executable File
41 lines
1.5 KiB
Python
Executable File
#!/usr/bin/env python3
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import argparse
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from datetime import datetime, timedelta
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from pathlib import Path
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def parse_time(s):
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return datetime.strptime(s, "%H:%M:%S,%f")
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def format_time(t):
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return t.strftime("%H:%M:%S,%f")[:-3]
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def shift_srt_in_memory(input_path: Path, offset_seconds: float, output_path: Path = None):
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offset = timedelta(seconds=offset_seconds)
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lines = input_path.read_text(encoding="utf-8").splitlines(keepends=True)
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shifted_lines = []
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for line in lines:
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if "-->" in line:
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start, end = line.strip().split(" --> ")
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new_start = format_time(parse_time(start) + offset)
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new_end = format_time(parse_time(end) + offset)
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shifted_lines.append(f"{new_start} --> {new_end}\n")
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else:
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shifted_lines.append(line)
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target_path = output_path if output_path else input_path
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target_path.write_text("".join(shifted_lines), encoding="utf-8")
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def main():
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parser = argparse.ArgumentParser(description="Shift subtitle timings in an SRT file.")
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parser.add_argument("input", type=Path, help="Path to the input .srt file")
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parser.add_argument("offset", type=float, help="Time offset in seconds (e.g., 2.5 or -1.25)")
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parser.add_argument("-o", "--output", type=Path, help="Optional output file. If not provided, input file is overwritten.")
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args = parser.parse_args()
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shift_srt_in_memory(args.input, args.offset, args.output)
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if __name__ == "__main__":
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main()
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