TEHRAN, Iran — Iran played down President Barack Obama's new video message to the Iranian people today, saying it welcomed the overtures but warned decades of mistrust can't easily be erased.

Obama released the video to coincide with the major Iranian festival of Nowruz, a 12-day holiday that marks the arrival of spring and the beginning of the new year in Iran. In the video, which has Farsi subtitles, Obama said the U.S. is prepared to end the strained relations if Tehran tones down its combative rhetoric.

But in the first government reaction to the video, Iranian President Mahmoud Ahmadinejad's press adviser said "minor changes will not end the differences" between Tehran and Washington.

"Obama has talked of change but has taken no practical measures to address America's past mistakes in Iran. If Mr. Obama takes concrete actions and makes fundamental changes in U.S. foreign policy toward other nations including Iran, the Iranian government and people will not turn their back on him," Ali Akbar Javanfekr told the Iranian state-run English-language Press TV satellite station.

It wasn't clear how many Iranians were able to see the video, which was not aired on state television in Iran today. It was likely shown on Farsi-language TV stations beamed in from outside of the country, but many Iranians don't watch television in the first days of long Nowruz holiday that is normally filled with family gatherings or vacations away from home.