Add HLS live mode

docs/guide/converting-media-files.md

@@ -92,13 +92,13 @@ A progress of `1` doesn't indicate the conversion has finished; the conversion i
 Tracking conversion progress can slightly affect performance as it requires knowledge of the input file's total duration. This is usually negligible but should be avoided when using append-only input sources such as [`ReadableStreamSource`](./reading-media-files#readablestreamsource).
 :::
 
-If you want to monitor the output size of the conversion (in bytes), simply use the `onwrite` callback on your `Target`:
+If you want to monitor the output size of the conversion (in bytes), simply use the `write` event on your `Target`:
 ```ts
 let currentFileSize = 0;
 
-output.target.onwrite = (start, end) => {
+const stopListening = output.target.on('write', ({ start, end }) => {
 	currentFileSize = Math.max(currentFileSize, end);
-};
+});
 ```
 
 ### Canceling a conversion

docs/guide/writing-media-files.md

@@ -223,14 +223,14 @@ The _output target_ determines where the data created by the `Output` will be wr
 
 ---
 
-All targets have an optional `onwrite` callback you can set to monitor which byte regions are being written to:
+All targets emit a `write` event you can listen to in order to monitor which byte regions are being written to:
 ```ts
-target.onwrite = (start, end) => {
+const stopListening = target.on('write', ({ start, end }) => {
 	// ...
-};
+});
 ```
 
-You can use this to track the size of the output file as it grows. But be warned, this function is chatty and gets called *extremely* frequently.
+You can use this to track the size of the output file as it grows. But be warned, this event is chatty and gets fired *extremely* frequently.
 
 ### `BufferTarget`