Add initial Restreamer implementation for YouTube-to-Jellyfin live restreaming

tests/test_ffmpeg_runner.py

@@ -0,0 +1,44 @@
+from restreamer.ffmpeg_runner import build_ffmpeg_args
+from restreamer.resolver import ResolvedStream
+
+
+def test_build_ffmpeg_args_single_input_without_headers() -> None:
+    stream = ResolvedStream(video_url="https://example.com/stream.m3u8")
+
+    args = build_ffmpeg_args(stream)
+
+    assert args[0] == "ffmpeg"
+    assert "-headers" not in args
+    assert args.count("-i") == 1
+    assert stream.video_url in args
+    assert args[-1] == "pipe:1"
+
+
+def test_build_ffmpeg_args_includes_headers_when_present() -> None:
+    stream = ResolvedStream(
+        video_url="https://example.com/stream.m3u8",
+        http_headers={"User-Agent": "test-agent", "Cookie": "a=b"},
+    )
+
+    args = build_ffmpeg_args(stream)
+
+    assert "-headers" in args
+    header_value = args[args.index("-headers") + 1]
+    assert "User-Agent: test-agent\r\n" in header_value
+    assert "Cookie: a=b\r\n" in header_value
+
+
+def test_build_ffmpeg_args_maps_separate_video_and_audio_inputs() -> None:
+    stream = ResolvedStream(
+        video_url="https://example.com/video.m3u8",
+        audio_url="https://example.com/audio.m3u8",
+    )
+
+    args = build_ffmpeg_args(stream)
+
+    assert args.count("-i") == 2
+    assert stream.video_url in args
+    assert stream.audio_url in args
+    assert "-map" in args
+    map_values = [args[i + 1] for i, a in enumerate(args) if a == "-map"]
+    assert map_values == ["0:v:0", "1:a:0"]