skip round trip tests on cuda + ffmpeg4

Author: Dan-Flores

test/test_ops.py

@@ -1175,10 +1175,15 @@ def test_video_encoder_round_trip(self, tmp_path, format, method, device):
             ffmpeg_version == 4 or (IS_WINDOWS and ffmpeg_version in (6, 7))
         ):
             pytest.skip("Codec for webm is not available in this FFmpeg installation.")
-        if device == "cuda" and format not in ("mp4", "mov", "mkv"):
-            pytest.skip(
-                f"No NVENC encoder available for format {format}, skipping test."
-            )
+        if device == "cuda":
+            if format not in ("mp4", "mov", "mkv"):
+                pytest.skip(
+                    f"No NVENC encoder available for format {format}, skipping test."
+                )
+            if ffmpeg_version == 4:
+                pytest.skip(
+                    "CUDA encoding on FFmpeg 4 results in lower quality, skipping round trip test."
+                )
 
         source_frames = self.decode(TEST_SRC_2_720P.path).data
 
@@ -1305,6 +1310,10 @@ def test_video_encoder_against_ffmpeg_cli(self, tmp_path, format, device):
                 pytest.skip(
                     f"No NVENC encoder available for format {format}, skipping test."
                 )
+            if ffmpeg_version == 4:
+                pytest.skip(
+                    "CUDA encoding on FFmpeg 4 results in lower quality, skipping round trip test."
+                )
 
         source_frames = self.decode(TEST_SRC_2_720P.path).data