[Webkit-unassigned] [Bug 160959] New: Audio HLS + WebVTT player error

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Aug 18 08:56:53 PDT 2016


https://bugs.webkit.org/show_bug.cgi?id=160959

            Bug ID: 160959
           Summary: Audio HLS + WebVTT player error
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: OS X 10.11
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: francesco.dambrosio at gmail.com

Created attachment 286370
  --> https://bugs.webkit.org/attachment.cgi?id=286370&action=review
player error

We have a problem with audio files streamed by Wowza 4 using HLS protocol, when we add VTT file. It doesn't works with Safari on Mac and iOS. 
The file is an .m4a with aac codec. 

1. create html page with video tag, add HLS with m4a source
2. add crossorigin="anonymous" properties
3. add track tag with vtt file
demo: http://www.fdambrosio.net/test/player7/safari-bug.html

We expect that it play audio with subtitles control button but player return "error" message, don't play audio and don't show subtitles. There's no error on Safari Console. 

Tested with: 
latest webKit release (11601.6.17, r204592) and Safari 9.1.1 on OSX 10.11.5
Safari on iOS 9.3.4 (iPhone 5S / iPhone6S)

Note: there's no issue using HLS stream with mp4 video file and vtt. Problem occurs only with audio HLS stream.

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