I\'m using libavcodec (latest git as of 3/3/10) to encode raw pcm to aac
(libfaac support enabled). I do this by calling avcodec_encode_audio
repeatedly with codec_context-
The problem seems to go away if the bitrate is less than 386000. Not sure why this is, as I can encode at bitrates higher than that using FAAC directly. But 128000 is good enough for my purposes, so I'm able to move forward.