Generally the supposed flow is something like this:
Issue a transcode command from EMS to encode your source and make it available inside EMS e.g. transcode source=rtmp://mysource/sampleStream groupName=group videoBitrates=750k audioBitrates=32k destinations=sample videoAdvancedParamsProfiles=veryfast
After the transcode, you are now able to push this stream to UDP using MPEG-TS e.g. pushStream uri=mpegtsudp://destinationrouter:port localStreamName=sample
In typical case, this is all that’s needed, however, for your other specific encoding requirements which you mentioned as:
1. constant bit rate
2. video mode : pal
3. null packets
These requirements needs custom modification to the transcode script in order to add those parameters.