Supporters of far-right criminal Blair Cottrell have been warned they risk being charged with contempt of court, after clapping and laughing in front of a judge.

Cottrell is appealing against his conviction for inciting hatred, contempt and ridicule of Muslims, after he and his supporters filmed the beheading of a dummy at Bendigo in 2015 to protest against the building of a mosque.

Blair Cottrell leaves court on Monday. Credit:AP

Some of his supporters laughed as the beheading video from the United Patriots Front Facebook page was played in the County Court of Victoria on Monday.

They also clapped after two other videos were played of Cottrell complaining about being labelled an extremist and media coverage of his case.