VideoEncoderSettings.BitrateMode (ExoPlayer library)

```
@Documented
@Retention(SOURCE)
@Target(TYPE_USE)
public static @interface VideoEncoderSettings.BitrateMode
```
The allowed values for bitrateMode.
- Variable bitrate: MediaCodecInfo.EncoderCapabilities.BITRATE_MODE_VBR.
- Constant bitrate: MediaCodecInfo.EncoderCapabilities.BITRATE_MODE_CBR.