Inconsistent frame reading behavior with VideoReader

[JarvisFei]

Hello VideoReader Team,

I am encountering a peculiar behavior when using VideoReader in my project. Specifically, the program hangs when attempting to read a sequence of frames including frame number 4, but works fine if the sequence skips this frame.

Environment:

• VideoReader version: decord 0.6.0
• Operating System: linux
• Python version: 3.8.16

Problem Description:
When I try to read a sequence of frames [1, 2, 3, 4, 5, 6] from a video, the read operation gets stuck on frame 4, and the program becomes unresponsive. However, when I read frames [1, 2, 3, 5, 6] without frame 4, everything works as expected, and all frames are read without any issues. No exceptions are thrown, and no error messages are displayed, leaving the program in a hanging state.

Steps to Reproduce:

1. Load the video using VideoReader.
2. Try to read the frames sequentially including frame 4, using get_batch([1, 2, 3, 4, 5, 6]).
3. The program hangs when it reaches frame 4.
4. Repeat the process with get_batch([1, 2, 3, 5, 6]), skipping frame 4, and observe that the operation completes successfully.

Expected Behavior:
VideoReader should consistently read any given sequence of frames without hanging, including when frame 4 is part of the sequence.

Attempted Workarounds:
I have tried the following steps to isolate the problem:

• Skipping frame 4 in the sequence, which prevents the hang, but is not a viable long-term solution.

Since I am unable to share the video file, I am providing this detailed description of the issue in hopes that it will be sufficient to identify a potential cause or solution.

I would greatly appreciate any assistance you can offer in resolving this issue or any suggestions for further troubleshooting steps.

Thank you for your time and attention.

Best regards,