Well with all that being said and the media is in a format the PS3 can natively play…
I can think of no reason why it is transcoding.
How about re-creating the issue and post logs and XML of the file in question.
Also you can look in the logs and look for entries that start with MDE.
(Not sure but you might need to switch on verbose logging to see MDE messages)
Those log entries should tell you why Plex thinks it needs to transcode.
I switched logs from off to verbose, but I don’t find any entry that starts with MDE (what’s more, there’s not even a word that contains MDE in all the text). I can see logs for everything but that.
About the file, here’s a mediainfo of it. I tested first to play it by plugging a pendrive ( I had to format one to FAT32 just for the test) with the file and it runs flawlessly, then I tried to stream it from plex and it transcodes from h264 to h264. I think the problem could be that all the files are in h264 level 4.1 (the one used nearly everywhere) but plex thinks it has to transcode to level 4.0 when it really isn’t necessary. The PS3 natively supports level 4.1 (if it didn’t it wouldn’t play any bluray disc as that’s the level used there).
Mediainfo about the video:
Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : High@L4.1 Format settings, CABAC : Yes Format settings, ReFrames : 12 frames Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 2 h 18 min Bit rate : 2 321 kb/s Maximum bit rate : 6 684 kb/s Width : 1 280 pixels Height : 534 pixels Display aspect ratio : 2.40:1 Frame rate mode : Constant Frame rate : 23.976 (24000/1001) FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.142 Stream size : 2.24 GiB (93%) Title : Whatever movie Writing library : x264 core 148 r2597.9 1808e2a VietHD_Custom_64 Encoding settings : cabac=1 / ref=12 / deblock=1:-3:-3 / analyse=0x3:0x133 / me=umh / subme=10 / psy=1 / fade_compensate=0.00 / psy_rd=0.95:0.00 / mixed_ref=1 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-2 / threads=17 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=0 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / fgo=0 / bframes=9 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=2pass / mbtree=0 / bitrate=2321 / ratetol=1.0 / qcomp=0.60 / qpmin=0:0:0 / qpmax=69:69:69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=62500 / vbv_bufsize=78125 / nal_hrd=none / filler=0 / ip_ratio=1.30 / pb_ratio=1.20 / aq=3:0.90 / aq-sensitivity=10.00 / aq-factor=1.00:1.00:1.00 / aq2=0 / aq3=0 Language : English Encoded date : UTC 2017-03-22 21:52:26 Tagged date : UTC 2017-03-22 21:55:57 Menus : 4