[Webkit-unassigned] [Bug 242059] New: HTML5 Video tag, HLS VOD: duration increases as the chunks are loading

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=242059

            Bug ID: 242059
           Summary: HTML5 Video tag, HLS VOD: duration increases as the
                    chunks are loading
           Product: WebKit
           Version: Safari 15
          Hardware: All
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: vaerlux at gmail.com

Steps to reproduce:

1. Limit internet connection speed. I tested using 1 mbps down.
2. Create a stream using <video> tag (I just used the sandbox at https://www.w3schools.com/html/tryit.asp?filename=tryhtml5_video_all): 
```
<video width="640" height="400" controls="controls" src="https://multiplatform-f.akamaihd.net/i/multi/april11/sintel/sintel-hd_,512x288_450_b,640x360_700_b,768x432_1000_b,1024x576_1400_m,.mp4.csmil/master.m3u8"></video>
</video>
```
3. Observe the displayed video duration in video controls. Initially the duration is correct, but as the .ts start loading, the duration drops to a few seconds and slowly increases as more chunks get downloaded.

The expected result is that the duration is always equal to the duration of the entire VOD.

The issue could be reproduced on Safari on MacOS (12.4) as well as on iOS

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