The decoder returned a frame that is past the expected one

[runitao]

Version

1.41.0

Describe the bug.

I use fn.readers.video to decode videos, the minimum reproducible example will report exception（see relevant log output).

I have test 4 cases, just the case 1 reports exception, others are well.

python dali_issue.py filelist_1.txt   # case 1
python dali_issue.py filelist_2.txt   # case 2, just reorder the video files
python dali_issue.py filelist_3.txt   # case 3, only 349047839_5.mp4
python dali_issue.py filelist_4.txt   # case 4, only 349064170_5.mp4

The video files in all cases are 349064170_5.mp4 and/or 349047839_5.mp4

PS. I test with weekly build too, the problem is still here.

NVIDIA-SMI 535.154.05 Driver Version: 535.154.05 CUDA Version: 12.2

Minimum reproducible example

git clone https://github.com/runitao/dali_example.git

Relevant log output

[/opt/dali/dali/operators/reader/loader/video_loader.h:179] file_list_include_preceding_frame uses the default value False. In future releases, the default value will be changed to True. iter 0 label [0 0 0 0] 140492320241408 Exception in thread: The decoder returned a frame that is past the expected one. The most likely cause is variable frame rate video. Filename: ./349064170_5.mp4 Traceback (most recent call last): File "dali_issue.py", line 56, in video, label = pipe.run() File "/opt/conda/lib/python3.8/site-packages/nvidia/dali/pipeline.py", line 1327, in run return self.outputs() File "/opt/conda/lib/python3.8/site-packages/nvidia/dali/pipeline.py", line 1165, in outputs return self._outputs() File "/opt/conda/lib/python3.8/site-packages/nvidia/dali/pipeline.py", line 1250, in _outputs return self._pipe.Outputs() RuntimeError: Critical error in pipeline: Error in GPU operator nvidia.dali.fn.readers.video, which was used in the pipeline definition with the following traceback:

File "dali_issue.py", line 27, in video_pipeline video, label, start_frame_num, timestamps = fn.readers.video(

encountered:

Error in worker thread: The decoder returned a frame that is past the expected one. The most likely cause is variable frame rate video. Filename: ./349064170_5.mp4

Other/Misc.

No response

Check for duplicates

• [x] I have searched the open bugs/issues and have found no duplicates for this bug report

[JanuszL]

Let me check this and get back to you with more info.

[JanuszL]

It seems that the video decoder incorrectly returns frame/time skipping the frame we are expecting to get. Let me check this with a video decoder team.

[JanuszL]

Tracked internally as nv4899180.