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5ee24ba241
Silent frames were coded with zero bytes, which decoders take as a lost
frame and conceal by extrapolating the preceding audio, rather than
outputting silence. A packet of such frames is also only one or two
bytes long, and the MPEG-TS muxer rejects packets shorter than two.
Code the silence flag in a two byte frame like libopus does, and keep
the encoder state in sync with the decoder after it: the decoder
predicts the band energies of the next frame from CELT_ENERGY_SILENCE,
and the pre-emphasis filter state at the start of the next overlap is
zero. As silent frames no longer have a size of zero, leave them out of
the rate control explicitly.
(cherry picked from commit b726a3b8c4)