re AVI to MP4 conversion

Hi

Bit of a minefield when it comes to converting AVI to MP4 and get a compliant version which will play in standalone bluray players ( Disk and/or USB pen )

I have tried a number od programs and the best so far is WINX free AVI to MP4 converter. However although I can get the video to play in my SONY BDS 185 Player, the screen is like the old 4.3 display. Cant get it t wide screen. Files `A`

If I play the files `A` through my media player, then everything is ok, but I want to put the files on a dvd and play on the bluray as a data disk.

I also have some other files `B` which play fine on both media player AND the bluray.....

I have used mediainfo to check the codecs etc and there are differences.

Is there a program to allow me to convert AVI to MP4 and allow me to enter the settings that are contained in the `B` files .

Cant think what else to do.

Thanks