Events

Transcoding will happen on a background thread, but we will send updates through the TranscoderListener interface, which can be applied when building the request:

kotlinCopy
Transcoder.into(filePath)
    .setListenerHandler(handler)
    .setListener(object: TranscoderListener {
         override fun onTranscodeProgress(progress: Double) = Unit
         override fun onTranscodeCompleted(successCode: Int) = Unit
         override fun onTranscodeCanceled() = Unit
         override fun onTranscodeFailed(exception: Throwable) = Unit
    })
    // ...

All of the listener callbacks are called:

• If present, on the handler specified by setListenerHandler()
• If it has a handler, on the thread that started the transcode() call
• As a last resort, on the UI thread

onTranscodeProgress

This simply sends a double indicating the current progress. The value is typically between 0 and 1, but can be a negative value to indicate that we are not able to compute progress (yet?).

This is the right place to update a ProgressBar, for example.

onTranscodeCanceled

The transcoding operation was canceled. This can happen when the Future returned by transcode() is cancelled by the user.

onTranscodeFailed

This can happen in a number of cases and is typically out of our control. Input options might be wrong, write permissions might be missing, codec might be absent, input file might be not supported or simply corrupted.

You can take a look at the Throwable being passed to know more about the exception.

onTranscodeCompleted

Transcoding operation did succeed. The success code can be: