Frame accessing from H.265(HEVC) videos issues

[haildceu1]

I get different frames count when using decord and opencv to access information from HEVC videos. Also, when I try to load certain segment from video, the clip is totally different compared to moviepy which receives time stamp directly.

vr = de.VideoReader(video_path)
cap = cv2.VideoCapture(video_path)
num_frames = cap.get(cv2.CAP_PROP_FRAME_COUNT)
if int(num_frames) != len(vr):
print(num_frames)
print(len(vr))