Low-quality output.

I was trying out this library but to my surprise, it decreases the video quality with default configuration. I did not specify any change to output format and simply wrote a pass-through task to test and the output video is highly pixelated.

The code I used to run the transcoder is as follows:

```kotlin
val mt = MediaTransformer(context)
mt.transform(
UUID.randomUUID().toString(),
Uri.parse(input),
output,
null,
null,
listener,
MediaTransformer.GRANULARITY_NONE,
null)
```

Is there anything I am missing? The code in demo app is split just too much to understand easily.

Start with the MediaTransformer entry point and the demo app's transcoding configuration, then reproduce the pass-through task shown in the issue. Trace how the default configuration selects output quality and verify that a default pass-through transform no longer produces a highly pixelated video.

Written by the indexing model from the issue text.