[carmen emarda]"What would you recommend to render 1080/24p clip to mp4 formated file such as xxxxx.mp4."
I use Handbrake. Real easy. And now there is a clever One-Clcik "Vegas2Hanbrake" script that uses a Frameserving option - very neat. Developed by Marco Ba he has seen a need to do this directly from the Vegas Timeline, and went ahead and developed it.
Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge
From within Vegas, you can use either the Mainconcept AVC or Sony AVC encoders and start with the Internet 1080p templates. Then you can adjust the parameters as necessary. Frame rate, video bitrate and audio bitrate, etc.