Fix "Transforming media" page

Some information there is not correct anymore.

PiperOrigin-RevId: 503141754

docs/transforming-media.md

@@ -37,16 +37,14 @@ Transformer transformer =
        .addListener(transformerListener)
        .addListener(transformerListener)
        .build();
        .build();
 // Start the transformation.
 // Start the transformation.
-transformer.startTransformation(inputMediaItem, outputPath);
+transformer.startTransformation(
+   new EditedMediaItem(inputMediaItem), outputPath);
 ~~~
 ~~~
 {: .language-java}
 {: .language-java}
 
 
-Other parameters, such as the `MediaSource.Factory`, can be passed to the
-builder.
-
-`startTransformation` receives a `MediaItem` describing the input, and a path or
-a `ParcelFileDescriptor` indicating where the output should be written. The
-input can be a progressive or an adaptive stream, but the output is always a
+`startTransformation` receives an `EditedMediaItem` describing the input, and a
+path or a `ParcelFileDescriptor` indicating where the output should be written.
+The input can be a progressive or an adaptive stream, but the output is always a
 progressive stream. For adaptive inputs, the highest resolution tracks are
 progressive stream. For adaptive inputs, the highest resolution tracks are
 always selected for the transformation. The input can be of any container format
 always selected for the transformation. The input can be of any container format
 supported by ExoPlayer (see the [Supported formats page][] for details), but the
 supported by ExoPlayer (see the [Supported formats page][] for details), but the
@@ -65,12 +63,16 @@ app is notified of events via the listener passed to the `Transformer` builder.
 Transformer.Listener transformerListener =
 Transformer.Listener transformerListener =
    new Transformer.Listener() {
    new Transformer.Listener() {
      @Override
      @Override
-     public void onTransformationCompleted(MediaItem inputMediaItem, TransformationResult result) {
+     public void onTransformationCompleted(
+        MediaItem inputMediaItem, TransformationResult result) {
        playOutput();
        playOutput();
      }
      }
 
 
      @Override
      @Override
-     public void onTransformationError(MediaItem inputMediaItem, TransformationResult result, TransformationException exception) {
+     public void onTransformationError(
+        MediaItem inputMediaItem,
+        TransformationResult result,
+        TransformationException exception) {
        displayError(e);
        displayError(e);
      }
      }
    };
    };
@@ -88,13 +90,15 @@ the `updateProgressInUi` method could be implemented to update a progress bar
 displayed to the user.
 displayed to the user.
 
 
 ~~~
 ~~~
-transformer.startTransformation(inputMediaItem, outputPath);
+transformer.startTransformation(
+   new EditedMediaItem(inputMediaItem), outputPath);
 ProgressHolder progressHolder = new ProgressHolder();
 ProgressHolder progressHolder = new ProgressHolder();
 mainHandler.post(
 mainHandler.post(
    new Runnable() {
    new Runnable() {
      @Override
      @Override
      public void run() {
      public void run() {
-       @ProgressState int progressState = transformer.getProgress(progressHolder);
+       @ProgressState int progressState =
+          transformer.getProgress(progressHolder);
        updateProgressInUi(progressState, progressHolder);
        updateProgressInUi(progressState, progressHolder);
        if (progressState != PROGRESS_STATE_NOT_STARTED) {
        if (progressState != PROGRESS_STATE_NOT_STARTED) {
          mainHandler.postDelayed(/* r= */ this, /* delayMillis= */ 500);
          mainHandler.postDelayed(/* r= */ this, /* delayMillis= */ 500);
@@ -123,7 +127,8 @@ Transformer transformer =
        .setFlattenForSlowMotion(true)
        .setFlattenForSlowMotion(true)
        .addListener(transformerListener)
        .addListener(transformerListener)
        .build();
        .build();
-transformer.startTransformation(inputMediaItem, outputPath);
+transformer.startTransformation(
+   new EditedMediaItem(inputMediaItem), outputPath);
 ~~~
 ~~~
 {: .language-java}
 {: .language-java}