- From: Jean-Yves Avenard via GitHub <sysbot+gh@w3.org>
- Date: Thu, 11 Aug 2016 23:11:48 +0000
- To: public-html-media@w3.org
jyavenard has just created a new issue for https://github.com/w3c/media-source: == Seeking in the buffered range should always succeed. == From: https://w3c.github.io/media-source/index.html#mediasource-seeking describe the steps on how to seek with MSE "If one or more of the objects in activeSourceBuffers is missing media segments for the new playback position If the HTMLMediaElement.readyState attribute is greater than HAVE_METADATA, then set the HTMLMediaElement.readyState attribute to HAVE_METADATA. " One can implicitly assume that seeking in the reported buffered range will always succeed. in particular as we have "The web application can use buffered to determine what the media element needs to resume playback." When the mediasource readyState is "open", the buffered range only reports where we actually have data. However, if the readyState is "ended" (https://w3c.github.io/media-source/index.html#widl-SourceBuffer-buffered) "If readyState is "ended", then set the end time on the last range in track ranges to highest end time." So let's assume that we have a media element that is made of an audio and video tracks. The audio track has a buffered range of [5-10] and the video track has [5-20]. When in "ended" readyState, the buffered attribute reported will as such be [5-20]" ; however we do not have audio data in the [10-20] range; so according to the seeking definition, the media element readyState should become HAVE_METADATA and seek can't succeed. As such two possibilities: 1- Have buffered always return the buffered range intersection of all tracks, regardless of the readyState value 2- Specify in the seeking steps, that if the reported buffered range contains the position, seeking must complete (so the UA when completing the seek would then play whatever left data it has without stalling to the end of the buffered range) I favour option 2. Please view or discuss this issue at https://github.com/w3c/media-source/issues/147 using your GitHub account
Received on Thursday, 11 August 2016 23:11:56 UTC