Avoid segfault in VideoClip test (#8148)

Author: NicolasHug

test/test_datasets_video_utils.py

@@ -60,7 +60,7 @@ def test_video_clips_custom_fps(self, tmpdir):
         video_list = get_list_of_videos(tmpdir, num_videos=3, sizes=[12, 12, 12], fps=[3, 4, 6])
         num_frames = 4
         for fps in [1, 3, 4, 10]:
-            video_clips = VideoClips(video_list, num_frames, num_frames, fps, num_workers=2)
+            video_clips = VideoClips(video_list, num_frames, num_frames, fps)
             for i in range(video_clips.num_clips()):
                 video, audio, info, video_idx = video_clips.get_clip(i)
                 assert video.shape[0] == num_frames