What happened + What you expected to happen

I want to log a video to wandb that is stored as a file, what I did was roughly.

python
from wandb import Video

result["video"] = Video("a_file", format="mp4")
train.report(result)

I just did this in a custom WandbLoggerCallback.log_trial_result function.

As a result the WandB logger did not only not log my video but no further metrics at all. I then realized that no final output of the _WandbLoggingActor was shown and I assume something has crashed it without logging an error.

Finally, I could solve the problem with using an absolute path for the video:

result["video"] = Video(os.path.abspath("a_file"), format="mp4")

I strongly assume that there is a silent FileNotFoundError underneath that is not logged.

Versions / Dependencies

ray, version 2.38.0
python3.10
Ubuntu
wandb, version 0.19.5

Reproduction script

Setup a Tuner with a WandbLoggerCallback.

In the trainable

from wandb import Video

def trainable(params):
    for i in range(19):
         result = {}
         result["video"] = Video("a_file", format="mp4")  # for the silent error id does not matter that the file does not exist
         train.report(result)

Issue Severity

Medium: It is a significant difficulty but I can work around it.