add trimation

converter/converter.py

@@ -149,11 +149,17 @@ class VideoHighStrategy(ConversionStrategy):
     """High quality video conversion: Lossless H.264 (video) + PCM (audio)."""
     def convert(self, input_file, output_file):
         cmd = [
-            "ffmpeg", "-y", "-i", input_file,
+            "ffmpeg", "-y", "-i", input_file
+        ]
+        # Add trim parameters if specified
+        if hasattr(self, "trim"):
+            start, end = self.trim
+            cmd += ["-ss", str(start), "-to", str(end)]
+        cmd += [
             "-c:v", "libx264", "-preset", "veryslow", "-crf", "18",
             "-pix_fmt", "yuv420p",
             "-movflags", "+faststart",
-            "-c:a", "pcm_s16le"                                   # Lossless audio using PCM
+            "-c:a", "pcm_s16le"  # Lossless audio using PCM
         ]
         if hasattr(self, "custom_params"):
             cmd.extend(self.custom_params)
@@ -164,7 +170,13 @@ class VideoLowStrategy(ConversionStrategy):
     """Low quality video conversion: H.264 (video) + AAC (audio)."""
     def convert(self, input_file, output_file):
         cmd = [
-            "ffmpeg", "-y", "-i", input_file,
+            "ffmpeg", "-y", "-i", input_file
+        ]
+        # Add trim parameters if specified
+        if hasattr(self, "trim"):
+            start, end = self.trim
+            cmd += ["-ss", str(start), "-to", str(end)]
+        cmd += [
             "-c:v", "libx264", "-preset", "fast", "-crf", "23",
             "-c:a", "aac", "-b:a", "192k"
         ]
@@ -176,9 +188,14 @@ class VideoLowStrategy(ConversionStrategy):
 class AudioHighStrategy(ConversionStrategy):
     """High quality audio conversion using FLAC."""
     def convert(self, input_file, output_file):
-        # Using -vn and -map to select only audio stream(s)
         cmd = [
-            "ffmpeg", "-y", "-i", input_file,
+            "ffmpeg", "-y", "-i", input_file
+        ]
+        # Add trim parameters if specified
+        if hasattr(self, "trim"):
+            start, end = self.trim
+            cmd += ["-ss", str(start), "-to", str(end)]
+        cmd += [
             "-vn",
             "-map", "0:a",
             "-c:a", "flac"
@@ -191,9 +208,14 @@ class AudioHighStrategy(ConversionStrategy):
 class AudioLowStrategy(ConversionStrategy):
     """Low quality audio conversion using MP3 (libmp3lame)."""
     def convert(self, input_file, output_file):
-        # Using -vn and -map to select only audio stream(s)
         cmd = [
-            "ffmpeg", "-y", "-i", input_file,
+            "ffmpeg", "-y", "-i", input_file
+        ]
+        # Add trim parameters if specified
+        if hasattr(self, "trim"):
+            start, end = self.trim
+            cmd += ["-ss", str(start), "-to", str(end)]
+        cmd += [
             "-vn",
             "-map", "0:a",
             "-c:a", "libmp3lame", "-b:a", "192k"
@@ -211,14 +233,17 @@ class MediaConverter:
     Main class that selects the appropriate conversion strategy based on media type
     and quality, then performs the conversion.
     """
-    def __init__(self, input_file, output_file, quality, custom_params=None):
+    def __init__(self, input_file, output_file, quality, custom_params=None, trim=None):
         self.input_file = input_file
         self.output_file = output_file
         self.quality = quality
         self.custom_params = custom_params or []
+        self.trim = trim  # Tuple of (start, end) times in seconds
         self.media_type = MediaDetector.detect_media_type(self.input_file)
         logging.info("Detected media type: %s", self.media_type)
         self.strategy = self.get_strategy()
+        if self.trim:
+            self.strategy.trim = self.trim
 
     def get_strategy(self):
         """Selects and returns the proper conversion strategy."""
@@ -254,6 +279,7 @@ def main():
                         help="Quality mode: high or low")
     parser.add_argument("--custom", nargs='*',
                         help="Additional custom ffmpeg parameters", default=[])
+    parser.add_argument("--trim", help="Trim the media between start-end seconds (e.g., 0.5-35)", default=None)
     args = parser.parse_args()
 
     # Fixed paths
@@ -265,6 +291,19 @@ def main():
         logging.error("Input file not found at %s", input_path)
         sys.exit(1)
 
+    # Parse trim argument if provided
+    trim_tuple = None
+    if args.trim:
+        try:
+            start_str, end_str = args.trim.split('-')
+            trim_tuple = (float(start_str), float(end_str))
+            if trim_tuple[0] >= trim_tuple[1]:
+                logging.error("Invalid trim range: start time must be less than end time.")
+                sys.exit(1)
+        except ValueError:
+            logging.error("Invalid trim format. Use format: start-end (e.g., 0.5-35)")
+            sys.exit(1)
+
     # Determine media type
     media_type = MediaDetector.detect_media_type(input_path)
     
@@ -288,11 +327,13 @@ def main():
     logging.info("Output file will be: %s", output_path)
     if args.custom:
         logging.info("Custom ffmpeg parameters: %s", args.custom)
+    if trim_tuple:
+        logging.info("Trimming media from %s to %s seconds", trim_tuple[0], trim_tuple[1])
 
     # Parse all metadata and save it as output.json in the output directory
     parse_metadata(input_path, os.path.dirname(output_path))
 
-    converter = MediaConverter(input_path, output_path, args.quality, args.custom)
+    converter = MediaConverter(input_path, output_path, args.quality, args.custom, trim=trim_tuple)
     converter.convert()
 
 if __name__ == "__main__":