The V-Nova LCEVC pipeline processes frames on internal background
worker threads. LCEVC_ReceiveDecoderPicture returns LCEVC_Again (-1)
when the worker has not yet completed the frame, which is the
documented "not ready, try again" response. The original code treated
any non-zero return as a fatal error (AVERROR_EXTERNAL), causing decode
to abort mid-stream.
Poll until LCEVC_Success or a genuine error is returned.
Signed-off-by: Peter von Kaenel <Peter.vonKaenel@harmonicinc.com>
Signed-off-by: James Almer <jamrial@gmail.com>
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