Bug 73405 – When playing audio in <video>, the poster is hidden on play

• Status: RESOLVED
• Resolution: FIXED
• Component: Media

[Jeroen Wijering]

Playing an audio file in <video> is allowed and works fine. However, when the audio starts playing, the poster image is removed. 

Per the spec, the poster image should stay visible:

"When no video data is available (... the media resource does not have a video channel), the video element represents the poster frame."

This also provides a better experience. A poster image is nicer than a white screen.

[Eric Carlson]

Safari on 10.7.2 behaves correctly.

[Eric Carlson]

But Safari 5.1 on 10.6.8 does not, so it apparently depends on the media engine.

[Eric Carlson]

We display the poster until HTMLVideoElement::hasAvailableVideoFrame returns true. That method asks the media engine if has video to display. The QTKit based method (MediaPlayerPrivateQTKit::hasAvailableVideoFrame) can't tell if a QTMovieLayer actually has frames ready to display, but it also doesn't check to see if the movie has video at all.

[Eric Carlson]

This could be fixed in each of the media engines that have a problem (at least QTKit, QuickTime, and Chrome), or by adding one test to HTMLVideoElement. I am going to go with the later.

[Eric Carlson]

Created attachment 117265 [details]
Proposed patch

[Darin Adler]

Comment on attachment 117265 [details]
Proposed patch

View in context: https://bugs.webkit.org/attachment.cgi?id=117265&action=review

> Source/WebCore/ChangeLog:8
> +        No new tests. (OOPS!)

Bad to not have tests.

Also can’t land the patch without removing the OOPS ;-)

[Radar WebKit Bug Importer]

<rdar://problem/10511668>

[Eric Carlson]

http://trac.webkit.org/changeset/101675