Try using 576i mpeg2 video and MP2 audio in a transport stream container (.ts). This is the standard used by SD broadcast digital TV.
Generally changing the container (.avi .WMV) doesn’t change the actual video and audio contained.
If you download and install MediaInfo and open your files and then use Treeview to export the text details of what is actually in there and post same, may be able to help more. Batting in the dark without this fundamental info
This may help to understand the difference between digital compression codecs and containers.
https://en.wikipedia.org/wiki/Comparison_of_video_container_formats