The browser client will transcode anything that isn’t already H.264 and those are already pretty low bit rate streams so loss of quality is expected. Plex for Windows will direct play/stream MPEG2 so no further loss in quality.
but no… Plex for Android shows “MP2 Stereo” while the server say AC3 5.1.
Default Quality is set to 720p 40 Mbps
when i set to original, you can only go back to “720p (high) - 4Mbps” and lower, nothing between 40 and 4.