I was recently traveling in a northern province where a member of the Thai Royal Family has a residence. While walking one morning along the river was approached by Thai MP's and ordinary police. I asked if I was allowed to film or take any photos along the river front near the residence, The answer was as long as I faced the camera towards the river while walking past the compound. A walked another 1000 feet and turned backed with no issues.

 

Are there any official short posts/signs or laws written by the government so I can have a future reference to show others that might wish to film that portion of the river ?

In Thailand, photography and filming near royal residences are subject to strict regulations to respect the privacy and security of the Royal Family. While there isn't a publicly available compilation of official signs or written laws specifically addressing photography restrictions near these residences, it's common to encounter local law enforcement or security personnel enforcing these rules on-site.

The Thai lèse-majesté law, outlined in Section 112 of the Thai Criminal Code, criminalizes defamation, insults, or threats against the King, Queen, Heir-apparent, or Regent, with penalties ranging from three to fifteen years of imprisonment. This law underscores the importance Thailand places on protecting the dignity of the monarchy.

Wikipedia

 

For foreign filmmakers, the Thailand Film and Video Act B.E. 2551 (2008) mandates obtaining a permit from the Thailand Film Office, Department of Tourism, before conducting any filming activities. This process involves hiring a local coordinator registered with the Thailand Film Office to assist with the application and ensure compliance with local regulations.

English Speaking Lawyers Thailand

 

Given the sensitivity surrounding royal premises, it's advisable to exercise caution when filming or photographing near such areas. Always seek permission from local authorities or security personnel before capturing images or footage near royal residences. While there may not be official signs detailing these restrictions, adhering to guidance from on-site officials and being aware of local customs and laws will help ensure respectful and lawful conduct.

That was perfect thank you.