TransformationOptions giving corrupt video

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I don't know is this a right place to ask doubts, but I need your help. My problem is this lib has less documetation.
I want to:
1. Trim vieo
2. compress video (maintaining original aspect ratio, width height can be decreased)
3. adding my custom image at bottom left corner with some margin to bottom and left side. One thing I want to maintain constant ratio of bitmap overlay width and height to the height & width of video.
```
TransformationOptions transformationOptions = new TransformationOptions.Builder()
.setGranularity(MediaTransformer.GRANULARITY_DEFAULT)
.setVideoFilters(null)
.setSourceMediaRange(new MediaRange(1000,5000))
.build();
```
When adding ```null``` in place of ```TransformationOptions``` in ```mediaTransformer.transform``` it is working fine. But with above code it is not giving any error but producing an empty file. **Am I missing something?**

SORRY I'm beginner

Start with TransformationOptions.Builder, MediaRange, and the MediaTransformer.transform call shown in the report, comparing the null-options path with the configured-options path. Reproduce the 1000–5000 source range case and determine why it produces an empty file; done means the configured transformation outputs valid video.

Written by the indexing model from the issue text.