This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
Draft
This page is not complete.
The appendWindowStart property of the 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 wthin 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.
var myAppendWindowStart = sourceBuffer.appendWindowStart; sourceBuffer.appendWindowStart = 2.0;
A double, indicating the start time of the append window, in seconds.
The following errors may be thrown when setting a new value for this property.
| Error | Explanation |
|---|---|
InvalidAccessError | An attempt was made to set the value to less than 0, or a value greater than or equal to SourceBuffer.appendWindowEnd. |
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. |
TBD
| Specification | Status | Comment |
|---|---|---|
| Media Source Extensions The definition of 'appendWindowStart' in that specification. | Candidate Recommendation | Initial definition. |
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
| Basic support | 23 | (Yes) |
25.0 (25.0)[1] 42.0 (42.0) | 11[2] | 15 | 8 |
| Feature | Android | Edge | Firefox Mobile (Gecko) | Firefox OS (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic support | 4.4.4 | (Yes) | No support | No support | 11 | 30 | No support |
[1] Available after switching the about:config preference media.mediasource.enabled to true. In addition, support was limited to a whitelist of sites, for example YouTube, Netflix, and other popular streaming sites. The whitelist was removed and Media Source Extensions was enabled by default in 42+ for all sites.
[2] Only works on Windows 8+.
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https://developer.mozilla.org/en-US/docs/Web/API/SourceBuffer/appendWindowStart