Sony XDCAM EX-1 and EX-3 series are one of the high-end professional Sony camcorders with outstanding video quality. The footages are wrapped in XDCAM codec MP4 format which is uncommon with normal quicktime supported mp4 files. Yet you can still load them into some NLE programs such as Premiere Pro CS6, but due to the codec issue, Sony XDCAM EX1/EX3 footages cannot work smoothly in CS6, which makes the editing become harsh to some extend.
As is mentioned above, due to the complex file structure in BPAV folder, any substandard customize renaming may make the footages cannot sync video and audio automatically.
If you copy the BPAV folder to another folder on the local hard drive, in Premiere, you can navigate to, import and edit that footage; but all the files are still named numbers from the camera. Using Bridge with the BPAV folder structure doesn't work anymore as for FCP.
Therefore, it should be a good idea to convert Sony XDCAM EX1/EX3 MP4 footages to Premiere Pro CS6 preferred format. Come and try this Sony XDCAM EX Video Converter, which is use-to-use, capable of converting XDCAM video to various formats, and supports batch renaming painlessly.