SOLVED: Movie exits with error code due "audio codec not supported"

[Deleted User]

that is consistent with the log, both would indicate a bandwidth issue

don't get too hung up on the wording of the error message being about audio, it could have received no audio and then couldn't play because of that
(i have received the same message when the subtitles caused an error)

need to focus on the network, i am not familiar with roku specifically so here are some things to try and i hope someone with more info will chime in

if roku supports ethernet, compare
if no ethernet consider a cheap usb to ethernet adapter, if possible
re-encode the video and perform some tests - copy audio, downgrade video bitrate keeping resolution
anything that can be used to test lan bandwidth to the server
- i usually use a reverse netcat with dd from dev/urandom to push the bandwidth at its max, but i am almost sure that is not an option for you
if the wireless router can be moved closer, out of cabinets, etc - wireless is very temperamental and can have interference
is the roku wifi 2.4, 5 or 6ghz

i apologize i cannot be more specific but i feel the issue has been identified, the "why" is the new goal, once the why is found then a resolution can present itself