Resolve memory leaks #98
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Description
In production, we noticed a steady increase in memory usage until our nodes would crash due to out of memory. Using valgrind and the pastebin below via
valgrind --leak-check=full node --expose-gc beamcoder.js, we discovered what appears to be memory leaks in the decoder, encoder, and filters due to frames and packets not being freed. This PR adds the necessaryav_frame_freeandav_packet_freecalls to avoid this memory leak. Apologies if the code is not ideal. I don't work in C++ day to dayhttps://pastebin.com/Q2fCP4qa