Anpassung --cut flag

tests/support/ffx_bundle.py

@@ -95,7 +95,25 @@ def write_vtt(path: Path, lines: tuple[str, ...]) -> Path:
     return path
 
 
-def create_source_fixture(workdir: Path, filename: str, tracks: list[SourceTrackSpec], duration_seconds: int = 1) -> Path:
+def create_source_fixture(
+    workdir: Path,
+    filename: str,
+    tracks: list[SourceTrackSpec],
+    duration_seconds: int = 1,
+    *,
+    video_encoder: str = "libx264",
+    video_encoder_options: tuple[str, ...] = (
+        "-preset",
+        "ultrafast",
+        "-crf",
+        "35",
+        "-pix_fmt",
+        "yuv420p",
+    ),
+    audio_encoder: str = "aac",
+    audio_encoder_options: tuple[str, ...] = ("-b:a", "48k"),
+    subtitle_encoder: str = "webvtt",
+) -> Path:
     output_path = workdir / filename
 
     has_video = any(track.track_type == TrackType.VIDEO for track in tracks)
@@ -189,21 +207,16 @@ def create_source_fixture(workdir: Path, filename: str, tracks: list[SourceTrack
     command += map_tokens
     command += metadata_tokens
     command += disposition_tokens
+    if has_video:
+        command += ["-c:v", video_encoder] + list(video_encoder_options)
+
+    if has_audio:
+        command += ["-c:a", audio_encoder] + list(audio_encoder_options)
+
+    if subtitle_input_indices:
+        command += ["-c:s", subtitle_encoder]
+
     command += [
-        "-c:v",
-        "libx264",
-        "-preset",
-        "ultrafast",
-        "-crf",
-        "35",
-        "-pix_fmt",
-        "yuv420p",
-        "-c:a",
-        "aac",
-        "-b:a",
-        "48k",
-        "-c:s",
-        "webvtt",
         "-t",
         str(duration_seconds),
         "-shortest",