FAQ

[WQF-USMP2][WQ-BS1] HTML5 4K Photo playback is shorter than I defined when I play HTML5 4K Video after HTML5 4K Photo

Environment/Preconditions

  • Software:
    • WQF-USMP2
    • WQ-BS1
  • Contents:
    • HTML5 contents ONLY
    • (non-HTML5) 4K Photo and/or (non-HTML5) 4K Video contents don’t lead to this issue.

Status

There aren’t any plans to fix the issue. (as of March 2018)

Symptoms

When you play playlists which combine HTML5 4K Photo and HTML5 4K Video in this order, the HTML5 4K Photo plane disappears for a couple of seconds before that content completes playback. This means that you see black screen. After that, HTML5 4K Video starts playing.

e.g.)

  • Playlist
    • [Content#1] HTML5 content with 4K Photo (i.e. <object type=”application/x-4k-photo” ...>)
    • [Content#2] HTML5 content with 4K Video (i.e. <video ...> tag)

For this issue, background is blacked out for a couple of seconds during playlist playback.

Workaround

Refer to the following Good Cases when making contents. Please check the details below.

For instance, insert a short dummy content between HTML5 4K Photo and HTML5 4K Video. This dummy content might not be shown correctly due to the issue, but you can show your intended HTML5 4K Photo and HTML5 4K Video as planned.

  • [Content#1] HTML5 4K Photo (i.e. <object type=”application/x-4k-photo” ...>)
  • [Content#2] short dummy content for transition
  • [Content#3] HTML5 4K Video (i.e. <video ...> tag)

Details

Route Cause

WQF-USMP2 and WQ-BS1 have a good mechanism to play HTML5 contents with gapless playback. To achieve this, they handle HTML5 4K Photo and HTML5 4K Video at once. However, they have a bug which terminates HTML5 4K Photo playback when starting HTML5 4K Video content processing. As a result, the HTML5 4K Photo plane disappears even if playback is incomplete.

Bad Cases

  • BadPlaylist#1: Play HTML5 4K Photo before HTML5 4K Video.
    • [Content#1] HTML5 4K Photo (i.e. <object type=”application/x-4k-photo” ...>) !// Black screen
    • [Content#2] HTML5 4K Video (i.e. <video ...> tag)

When a playlist has a combination of 4K-Photo contents and 4K-Video contents, this issue is reproduced. It's one of bad cases.

  • BadPlaylist#2: When a playlist has HTML5 4K Video at the top and HTML5 4K Photo at the bottom, it eventually plays HTML5 4K Video after HTML5 4K Photo. This combination reproduces the issue.
    • [Content#1] HTML5 4K Video (i.e. <video ...> tag)
    • [Content] : (some contents)
    • [Content#2] HTML5 4K Photo (i.e. <object type=”application/x-4k-photo” ...>) !// Black screen
  • BadPlaylist#3: Play HTML5 4K Photo before HTML5 4K Video.
    • [Content#1] HTML5 4K Photo (i.e. <object type=”application/x-4k-photo” ...>)
    • [Content#2] HTML5 4K Photo (i.e. <object type=”application/x-4k-photo” ...>) !// Black screen
    • [Content#3] HTML5 4K Video (i.e. <video ...> tag)

Good Cases

  • GoodPlaylist#1: Insert Non-HTML5 content between HTML5 4K Photo and HTML5 4K Video.
    • [Content#1] HTML5 4K Photo (i.e. <object type=”application/x-4k-photo” ...>)
    • [Content#2] Non-HTML5 content
    • [Content#3] HTML5 4K Video (i.e. <video ...> tag)
  • GoodPlaylist#2: There is no combination of HTML5 4K Photo and HTML5 4K Video.
    • [Content#1] HTML5 4K Video (i.e. <video ...> tag)
    • [Content#2] HTML5 4K Video (i.e. <video ...> tag)
  • GoodPlaylist#3 and GoodPlaylist#4: Play HTML5 4K Photo before HTML5 4K Video, in separate playlists.
    • [Playlist#1]
      • : (some contents)
      • [Content] HTML5 4K Photo (i.e. <object type=”application/x-4k-photo” ...>)
    • [Playlist#2]
      • [Content] HTML5 4K Video (i.e. <video ...> tag)
      • : (some contents)

Additional Information

  • BadPlaylist: Combining HTML5 4K Photo and HTML5 4K Video in one HTML5 content.
    • This causes a black screen when switching contents. On an additional note unrelated to the issue, you should check contents carefully when making contents which have both HTML5 4K Photo and HTML5 4K Video.
    • [Content!#1] HTML5 4K Photo (i.e. <object type=”application/x-4k-photo” ...>) and 4K Video (i.e. <video ...> tag) !// Black screen