Workaround #73
Workaround #73

This isn't a permanent fix; it just restores the default still port
encoding that picamera used prior to 1.3, which should ensure that users
wanting to peform full-resolution YUV captures can do so. However,
attempting to perform JPEG captures afterwards will cause future
full-res YUV captures to fail until the camera is re-initialized (see
discussion in #73 for more details)

ListFranz/picamera,waveform80/picamera,tfroehlich82/picamera,rocky1001/picamera