MPEGTS & HLS: Only second segment onwards is valid
For non-conventional layouts, the native AAC encoder writes a PCE section in the bitstream header as part of the AudioSpecificConfig. However, it does so only at the beginning, therefore subsequent files have AAC streams with this missing.

Workaround is to change to a different packetization scheme for AAC in MPEG-TS.  

Add -hls_ts_options mpegts_flags=latm when generating the HLS package.