All my avi doesn’t work with my NAS but the same file on my NAS with an MKV (Matroska) container works fine.
To do the conversion AVI to MKV, I just change the container and not re-encode the video.
The same AVI file work fine on USB stick plug on the WD TV Live.
the avi files do not work across the network but works on USB stick, the same files in MKV work on network.
I do not want to convert all my videos !
(Sorry for my poor English, feel free to correct me