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Laszlo Toroczkai, the ultranationalist mayor of a small Hungarian border town, posed with his security forces in a video warning to migrants posted on social networks.

While images of Hungarian riot police officers firing tear gas and water cannons at migrants along the Serbian border on Wednesday appalled human rights activists, the mayor of one small town in the south of Hungary remains concerned that his nation might still seem too welcoming to those fleeing war or poverty.

To remedy this, Laszlo Toroczkai, an ultranationalist with a flair for the dramatic, released a personal “Message to illegal immigrants from Hungary” on Facebookand YouTube late Wednesday, threatening them with arrest and displaying his town’s security hardware in a video edited in the style of a big-budget action movie.

After a simulated chase sequence filmed from the air — featuring a helicopter, a motorcycle and two burly men on horses — Mr. Toroczkai, mayor of Asotthalom, uses Google Maps to illustrate that the land route from Serbia to Germany is longer through Hungary than it is through Croatia and Slovenia. He does not mention that it is also far more mountainous.

“Hungary is a bad choice,” he intones at the end of the video. “Asotthalom is the worst.”

The video, which was promoted by Mr. Toroczkai’s allies in the far-right Jobbik party, quickly racked up hundreds of thousands of views and admiring comments.

As Szabolcs Panyi of Hungary’s Index.hu news site reported, the video was quickly remixed and mocked by Hungarian bloggers from the opposite end of the political spectrum.

Before he was elected the mayor of Asotthalom, a village of about 4,000 people near the border with Serbia, Mr. Toroczkai was well known for his extremist views as the leader of the 64 Counties Youth Movement, which calls for Hungary to reclaim the lands outside its current borders ceded after World War I.

In its online propaganda, the movement betrays a fondness for rallies in rural settings and fascist banners.

Despite his aversion to illegal border crossing, Mr. Toroczkai was beaten up by Serbian nationalists in 2008 after sneaking across the frontier to attend a rally in the Serbian province of Vojvodina, which is home to a large population of ethnic Hungarians.

It is not clear who produced his video message, but earlier this week, Mr. Toroczkai — who was once expelled from a far-right party as too radical — posted a link on Facebook to another video, “made by a friend,” showing what he called “apocalyptic” scenes at the border. That video was set to music that seemed to have been borrowed from a video game or action film.