sheenachhabra ac67f739d4 Specify which input file has B-frames in Transformer demo app
For out of order B-frames, the samples comes out of order and hence
presentation timestamps are not strictly increasing.
This can be verified by adding following assertion in `writeSampleData()` API
either in `MuxerWrapper` or in `Muxer API`.
```
checkArgument(
          bufferInfo.presentationTimeUs > lastSamplePresentationTimeUs,
          "Out of order B-frames are not supported");
```

PiperOrigin-RevId: 589152093
2023-12-08 09:23:42 -08:00
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