advanced fade ffmpeg script

Author: aegroto

ff/fade.py

@@ -0,0 +1,51 @@
+from argparse import ArgumentParser
+from ffmpeg import FFmpeg
+
+
+def fade_filter_string(fade_type: str, start_sample: int, num_samples: int):
+    return f"afade=t={fade_type}:ss={start_sample}:ns={num_samples}"
+
+
+def main():
+    parser = ArgumentParser()
+    parser.add_argument("input")
+    parser.add_argument("output")
+    parser.add_argument(
+        "-t", "--type", choices=["in", "out"], action="extend", nargs="+"
+    )
+    parser.add_argument(
+        "-ss", "--start_sample", action="extend", type=int, nargs="+"
+    )
+    parser.add_argument(
+        "-ns", "--num_samples", action="extend", type=int, nargs="+"
+    )
+    args = parser.parse_args()
+
+    print(args)
+
+    af_string = ",".join(
+        [
+            fade_filter_string(fade_type, start_sample, num_samples)
+            for (fade_type, start_sample, num_samples) in zip(
+                args.type, args.start_sample, args.num_samples
+            )
+        ]
+    )
+
+    print(f"Applied audio filter option: {af_string}")
+
+    ffmpeg = (
+        FFmpeg()
+        .option("y")
+        .input(args.input)
+        .output(
+            args.output,
+            af=af_string,
+        )
+    )
+
+    ffmpeg.execute()
+
+
+if __name__ == "__main__":
+    main()

ff/fade_in.py

@@ -9,7 +9,9 @@ def main():
     parser.add_argument("rate", type=int)
     args = parser.parse_args()
 
-    ffmpeg = FFmpeg().option("y").input(args.input).output(args.output, ar=args.rate)
+    ffmpeg = (
+        FFmpeg().option("y").input(args.input).output(args.output, ar=args.rate)
+    )
 
     ffmpeg.execute()
 

ff/subsample.py

@@ -4,7 +4,9 @@
 from own.io import read_samples, write_samples
 
 
-def resample(original: List[int], original_rate: int, target_rate: int) -> List[int]:
+def resample(
+    original: List[int], original_rate: int, target_rate: int
+) -> List[int]:
     original_num_samples = len(original)
     ratio = target_rate / original_rate
     target_num_samples = int(original_num_samples * ratio)

own/subsample.py

@@ -0,0 +1 @@
+line-length = 80