Video files of test runs are attached to the Allure Report as 0KB files or multiples of 256KB in size

[lukaszewskimichal]

Hi All,

I use Allure Report to present the results of e2e tests written using Playwright and PyTest.
I have tried to implement adding test run video to the test report in Allure Report but I have encountered a issue where files added to Allure Report are empty (0 KB in size) even though the source video files are valid, alternatively the files are added with a fixed size of 256 KB (or a multiple of this size) no matter what size the source video files are.
I add the video files to Allure Report using the allure.attach.file() method in WEBM format.

I have tried to find a solution to this problem on the Internet, but without success, so I decided to ask for advice here.
I only found a thread about this problem on stackoverflow, but without a solution (link to this thread).

I would appreciate your help or any guidance.

[baev]

The issue is with file buffers. The file system buffers the data on write, and if you call allure.attach.file() method before the data is flushed to disk — you'll get the empty attachment. It seems like the file system flushes data in 256K chunks — that's why you see files of such size.

You can try to use fsync to force buffers to be flushed before calling allure.attach.file() method.

[lukaszewskimichal]

This was indeed the cause of this issue. Thanks a lot for your help!