SourceBuffer: appendWindowStart property

{{APIRef("Media Source Extensions")}}{{AvailableInWorkers("window_and_dedicated")}}

The appendWindowStart property of the {{domxref("SourceBuffer")}} interface controls the timestamp for the start of the append window, a timestamp range that can be used to filter what media data is appended to the SourceBuffer. Coded media frames with timestamps within this range will be appended, whereas those outside the range will be filtered out.

The default value of appendWindowStart is the presentation start time, which is the beginning time of the playable media.

Value

A double, indicating the start time of the append window, in seconds.

Exceptions

The following exceptions may be thrown when setting a new value for this property:

• InvalidAccessError {{domxref("DOMException")}}
  • : Thrown if an attempt was made to set the value to less than 0 or to a value greater than or equal to {{domxref("SourceBuffer.appendWindowEnd")}}.
• InvalidStateError {{domxref("DOMException")}}
  • : Thrown if this {{domxref("SourceBuffer")}} object is being updated (i.e., its {{domxref("SourceBuffer.updating")}} property is currently true), or this SourceBuffer has been removed from the {{domxref("MediaSource")}}.

Examples

TBD

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• {{domxref("MediaSource")}}
• {{domxref("SourceBufferList")}}