[Webkit-unassigned] [Bug 245943] New: Dozens of data ranges in incorrect order requested before video playback starts

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=245943

            Bug ID: 245943
           Summary: Dozens of data ranges in incorrect order requested
                    before video playback starts
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: naktinis at gmail.com

Created attachment 462763

  --> https://bugs.webkit.org/attachment.cgi?id=462763&action=review

Range requests

I've observed this with multiple mp4 videos from different sources and this doesn't happen on other browsers.

When I open a video it performs many download requests each of increasing start time and each until the end of the video (I believe they also get immediately aborted by the browser), in the following order:
GET Range: bytes=0-1                 -> 206
GET Range: bytes=0-218098324         -> 206
GET Range: bytes=1769472-218098324   -> 206
GET Range: bytes=5242880-218098324   -> 206
[keeps making/aborting about 80 requests like this, depending on the file size, meanwhile the video is not playing]
GET Range: bytes=214958080-218098324 -> 206
[then it jumps back to the start and only at this point, after a minute or two, it starts playing the video]
GET Range: bytes=0-42139647          -> 206
GET Range: bytes=34209792-218098324  -> 206
GET Range: bytes=36700160-218098324  -> 206
GET Range: bytes=39190528-218098324  -> 206
[keeps increasing the start value again, and then randomly these requests are intertwined with what looks like reasonable requests like the one below]
GET Range: bytes=49217536-49283071   -> 206
[meanwhile keeps making these "get data until the end" requests]
GET Range: bytes=80936960-218098324  -> 206
[after some time another reasonable range request]
GET Range: bytes=62324736-62717951   -> 206

and so on...

Not sure what's causing this sequence of requests, but it sure looks irregular and makes viewing some videos on Safari almost impossible (meanwhile such problems don't occur on other browsers like Firefox and Chrome, so it's probably not just server issues, or if they are, they can be worked around).

Let me know if I can provide any further info.


A couple of example URLs where this happens:
https://cdn.muse.ai/w/658cb0019af04f7016b9686a6329e9120f97cb7d0cb67ab5fa0af6dd4f519e40/videos/video-1080p-video.mp4
http://docs.evostream.com/sample_content/assets/bunny.mp4

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