ffmpeg added support for 8 channel E-AC3/dependent stream decoding a while ago:
But the latest Plex preview transcoder builds still see the snip.eac3 sample from that ticket as:
Stream #0:0: Audio: eac3, 48000 Hz, 5.1(side), s16p
I’m wondering if Plex’s modified version of ffmpeg/libavcodec diverges because of the codec download & EAE stuff.
I feel OK pinging @ridley since she created the FFmpeg ticket …