Film producer Siddharth Roy Kapur, who is backing an upcoming movie on the life of Indian astronaut Rakesh Sharma, says producing a film -- irrespective of its genre -- is never an easy task.Kapur was interacting with the media at a special screening of Malayalam film "Ranam" here on Tuesday.On reports that actor Shah Rukh Khan will start shooting for Mahesh Mathai's directorial "Salute" -- the Rakesh Sharma biopic -- Kapur said: "We should be starting it quite soon. It's all on track but I will prefer to make an official announcement."Asked about the challenges of making a biopic, Kapur said: "I think producing any film is never easy because there are always different considerations when it comes to different movies and especially in a biopic, because you have to be true to the life of a person and you can't take liberty in making something completely different from his actual life."It also gives you a chance to be able to tell a true story of heroism.There are lots of unsung heroes that we have in our country who deserve a biopic on their life."There are many heroes in India other than those in sports, cinema and politics... So, we should look at a lot of inspirations when it comes to movies that you want to make."On the trend of biopics in Hindi cinema, Kapur said: "I think it's always important to see quality of a film. So, regardless of whether it's a biopic or a horror film or a comedy film or an action film, if it is a good film, it is going to run."So, I don't think that there is trend of biopics, but yes, there have been many successful ones of late, and very often people tend to gravitate towards making those films much more."