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Status: Assigned
EstimatedDays: ----
NextAction: ----
OS: ----
Pri: 3
Type: Bug

issue 896242

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Issue 651765: Failing web-platform-tests for MSE that pass in Edge, Firefox and Safari

Reported by, Sep 30 2016 Project Member

Issue description

These failures need analysis, but may point to low-hanging fruit for improving interop. Judgement is required, the failures may be entangled with spec issues.

See  issue 651572  for the source of this data, which includes failing subtests.

Note: Results may have changed in the interim.

Comment 1 by, Oct 11 2016

Status: Available (was: Untriaged)
Both tests pass if the full MIME string is used for the videos: for instance, 'video/mp4;codecs="avc1.42001e"'.

The tests use video/mp4 which Chrome doesn't recognize as supported.

Should the tests be fixed or should Chrome understand video/mp4 with some default codecs?

Comment 2 by, Oct 12 2016

wolenetz@, seems like doesn't give a reason why MediaSource.isTypeSupported('video/mp4') could return false, would you agree? "If the MediaSource does not support the specified combination of media type, media subtype, and codecs then return false" could be taken to mean anything, but the note about "maybe" and "probably" sure makes it seem like 'video/mp4' should return true.

Comment 3 by, Apr 21 2017

Project Member
The following revision refers to this bug:

commit 0452bcf300c90ef3707f530cdec61c5397627cc9
Author: foolip <>
Date: Fri Apr 21 17:05:55 2017

Import MSE tests from web-platform-tests

Some of the upstream tests originate from http/tests/media/media-source/
and in the long run these should be consolidated. Importing is the first
step, and may reveal interop problems in need of attention.

BUG= 624037 , 633669 ,651765,

Cr-Commit-Position: refs/heads/master@{#466370}


Comment 4 by, Oct 24 2017

Components: -Blink>Media Internals>Media>Source

Comment 5 by, Oct 24 2017

Status: Assigned (was: Available)

Comment 6 by, Oct 12

Summary: Failing web-platform-tests for MSE that pass in Edge, Firefox and Safari (was: 2 failing web-platform-tests for MSE that pass in Firefox and Edge)
Here are two updated reports of Chrome-only failures and the "pass in Firefox and Edge" variant that this bug was reported against:

wolenetz@, can you take a look?

Comment 7 by, Oct 17

Blocking: 896242

Comment 8 by, Oct 18

Blocking: -651572

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