Custom Medium trust level and allowing to run exe files using process(system.diagnostics)

Hello,

We use ffmpeg.exe for editing videos and another exe for merging videos.

We used to run applications under full trust level and it worked fine,

Now we had to change our application to medium trsut level for one of our clients and the conversion giving us many problems.

We resolved many of them but using of unmanaged code is the only one we got stuck at.

The ffmpeg.exe and the other exe.s which we use are being blocked.

Is there any way we can create a custom trust level where we can allow only these exe s to run.

Any suggestions will be appreciated

Thanks