Adding ffmpeg extension for supporting more codecs

[hrithvik123]

I noticed in my app that videos using DTS audio codec are not playing. Are there any plans to include the ffmpeg extension for transcoding?

[hrithvik123]

@eduardoRoth any change you could include ffmpeg extension for exoplayer in version 5 of the plugin? a build with support for common audio formats like aac, ac3, eac3 would be pretty helpful