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modified videodataset for window multiprocessing #8323

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8 changes: 7 additions & 1 deletion monai/data/video_dataset.py
Original file line number Diff line number Diff line change
Expand Up @@ -140,7 +140,13 @@ def get_fps(self) -> int:
def get_frame(self) -> Any:
"""Get next frame. For a file, this will be the next frame, whereas for a camera
source, it will be the next available frame."""
ret, frame = self._get_cap().read()
#Assign explicit videocapture object to cap to realease file to avoid error in multiprocessing
if self.multiprocessing:
cap = self._get_cap()
ret, frame = cap.read()
cap.release()
else:
ret, frame = self._get_cap().read()
if not ret:
raise RuntimeError("Failed to read frame.")
# Switch color order if desired
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