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avviddec: Enforce allocate new AVFrame per input frame

Seungha Yang requested to merge seungha.yang/gst-libav:handle-avframe-reuse into master

... if ffmpeg would reuse the allocated AVBuffer. Reused AVFrame by the ffmpeg seems to break our decoding flow since the reused AVFrame holds the initial opaque data (GstVideoCodecFrame in this case), so we couldn't trace the our in/out frames. To enforce get_buffer() call per output frame, hold another reference to the AVBuffer in order to mark the AVBuffer as not writable.

Fixes: #62 (closed)

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