Or Iravu was a stage play written by
C. N. Annadurai. It was originally written for
K. R. Ramasamy's Krishnan memorial drama company by Annadurai.
A. V. Meiyappan of
AVM Productions decided to make a film based on the play. Annadurai was paid 10,000 for writing the screenplay. Annadurai went to AVM studios and wrote the entire script and dialogues totalling 300 pages in a single night. The screenplay was later modified by the director and the producer of the film. This was the third film to be made based on Annadurai's plays after
Velaikari (1949) and
Nallathambi (1949).
P. Neelakantan, who had begun working for AVM in the 1947 film
Naam Iruvar as assistant director, made his directorial debut with this film. Per Annadurai's recommendation, Ramasamy was hired to play the hero, reprising his role from the play. The play depicted events that happen in a single night, and older incidents were depicted using flashbacks, but in the film version, flashbacks were replaced with a linear narration. The completed film was 14,980 feet in length. == Soundtrack ==