Adobe Media Encoder CS4 does not natively support encoding videos directly into the .m2ts format, which is commonly used for Blu-ray discs. Furthermore, CS4 is quite outdated and may not have the necessary capabilities to handle 4K video efficiently, as 4K was not commonly used at the time of its release.
To achieve your goal, you might consider using a more recent version of Adobe Media Encoder or another video conversion software that supports 4K and .m2ts format. Once you have your 4K video converted to .m2ts using a suitable software, you can transfer it to a flash drive. Ensure the flash drive is formatted in a compatible file system for your Blu-ray player, such as FAT32 or exFAT, to ensure the Blu-ray player can read the files correctly.
