Corrupted frames at beggining on several Samsung devices

[ypresto]

Original

Corrupted

Other corruptions:

• color changes to green

Reproduced on

• Galaxy S6 Edge (docomo SC-04G)
• GALAXY Note II (docomo SC-02E)

[ypresto]

MediaCodec#flush() seems to cause this bug on some devices.

[ypresto]

Retrieving output format from codec then reset (flush()) and restart was causing this bug.
Now this library enqueues output from encoders before output format of all tracks are determined.