This shows that you have no idea about cooking. 1) In this video no problems were edited. If I record the entire process it will take more than an hour that nobody will be interested in watching. These are just step by step instructions, the rest you have to do with your common sense. In each subtitle, I mentioned how the outcome for each step should be. 2) Cooking time for mutton is comparatively high than chicken to get soft meat. That's why mutton biryani takes more time than chicken or veg biryani. 3) This recipe doesn't overfill the max safe level. It is just on the safe level. Otherwise, the water would be sprayed out of the pressure valve. 4) Soaking rice is important in making biryani to get the best texture and flavor. 5) If you don't want to hear the whistles or don't like the steam to be released in the mid of cooking, you can turn the flame to low and wait for some more time to get it done. 6) I never upload a recipe that doesn't work. I don't want to fool anybody. I just want to make cooking easy for everyone and share the recipes that I enjoy. If you follow the steps correctly, you will get a perfect outcome. 7) If you use pressure cookers in the right way, they are safe to use. We are using a pressure cooker for everyday cooking. They need to be washed and cleaned properly. Especially the pressure valve needs to be cleaned properly.