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The appendWindowEnd property of the SourceBuffer interface controls the timestamp for the end 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 wthin this range will be appended, whereas those outside the range will be filtered out.

The default value of appendWindowEnd is positive infinity.


var myAppendWindowEnd = sourceBuffer.appendWindowEnd;

sourceBuffer.appendWindowEnd = 120.0;


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


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

Exception Explanation
InvalidAccessError An attempt was made to set the value to less than or equal to SourceBuffer.appendWindowStart, or NaN.
InvalidStateError This SourceBuffer object is being updated (i.e. its SourceBuffer.updating property is currently true), or this SourceBuffer has been removed from the MediaSource.




Specification Status Comment
Media Source Extensions
The definition of 'appendWindowEnd' in that specification.
Recommendation Initial definition.

Browser compatibility

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See also