Cha

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Hi Ciro: With ffmpeg 4.1.3 and platform android, method encode_example in encode.c seems to work wrong, it only encode first frame successfully. Log of write frames as following: ![image](https://user-images.githubusercontent.com/2815473/59173479-a5c88480-8b7f-11e9-8eb5-192dca197c30.png)

ffmpeg
android