[Webkit-unassigned] [Bug 160459] New: [MSE] Decoder error caused by multi-SPS/PPS init segment and no sample duration

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Aug 2 11:44:08 PDT 2016


            Bug ID: 160459
           Summary: [MSE] Decoder error caused by multi-SPS/PPS init
                    segment and no sample duration
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joeyparrish at google.com

GPAC's DASH sequences [1] cause decoder errors on Safari. For example, "live profile with bitstream switching support, Audio+Video" [2] and "main profile, multiple files with bitstream switching support, Audio+Video" [3].  (We have not exhaustively tested all sequences GPAC hosts, so there may be others.)

Shaka Player [4] is using these as test vectors to ensure compatibility with GPAC, but our tests for these fail on Safari. As far as we can tell, there are two features that make the failing GPAC vectors unique in our tests: multiple SPS/PPS in the init segments, and no sample duration.

To reproduce:

1. Open JS console
2. Navigate to http://storage.googleapis.com/shaka-demo-assets/_bugs/multiple-sps-media/index.html
3. Notice the decoder error on the console

This same content works on Chrome and Firefox on Mac, so we would expect to be able to play this content on Safari as well.

[1] https://gpac.wp.mines-telecom.fr/2012/02/23/dash-sequences/
[2] http://download.tsi.telecom-paristech.fr/gpac/DASH_CONFORMANCE/TelecomParisTech/mp4-live/mp4-live-mpd-AV-BS.mpd
[3] http://download.tsi.telecom-paristech.fr/gpac/DASH_CONFORMANCE/TelecomParisTech/mp4-main-multi/mp4-main-multi-mpd-AV-BS.mpd
[4] https://github.com/google/shaka-player

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