reader bug

[EnzoWuu]

There seems to be a bug in the videoreader module. When I use the following two pieces of code to read image content, the results are different. The only difference between the two code snippets is whether the frame image is read within an if statement.Can you help me understand what the issue is? Which code is correct?

from decord import VideoReader, cpu
import os
from PIL import Image
save_dir = 'data/'
video_path = 'test.asf'
vr = VideoReader(video_path, ctx=cpu(0))

# 获取视频的总帧数和帧率
total_frames = len(vr)
fps = vr.get_avg_fps()
frames_to_save_per_second = 1
# 保存帧
saved_frame_count = 0
for i in range(total_frames):
    # 判断是否需要保存当前帧
    print(frames_to_save_per_second, fps, total_frames)
    frame = vr[i].asnumpy()
    img = Image.fromarray(frame)
    if (i % int(fps // frames_to_save_per_second)) == 0:

        # 计算时间戳
        timestamp = i / fps
        timestamp_str = f"{timestamp:.5f}"  # 5位小数

        file_path = os.path.join(save_dir, f"{timestamp_str}.jpg")
        #log.debug(f"file_path: {file_path}")

        img.save(file_path)

        # timestamps_fact.append(timestamp_str)
        saved_frame_count += 1

from decord import VideoReader, cpu
import os
from PIL import Image
save_dir = 'data/'
video_path = 'test.asf'
vr = VideoReader(video_path, ctx=cpu(0))

# 获取视频的总帧数和帧率
total_frames = len(vr)
fps = vr.get_avg_fps()
frames_to_save_per_second = 1
# 保存帧
saved_frame_count = 0
for i in range(total_frames):
    # 判断是否需要保存当前帧
    print(frames_to_save_per_second, fps, total_frames)
    if (i % int(fps // frames_to_save_per_second)) == 0:
        frame = vr[i].asnumpy()
        img = Image.fromarray(frame)

        # 计算时间戳
        timestamp = i / fps
        timestamp_str = f"{timestamp:.5f}"  # 5位小数

        file_path = os.path.join(save_dir, f"{timestamp_str}.jpg")
        #log.debug(f"file_path: {file_path}")

        img.save(file_path)

        # timestamps_fact.append(timestamp_str)
        saved_frame_count += 1