Would be nice if you describe in more details what exactly did you try, with what version of IPP,compiler and operating system.
My concerns is about your words 'I saved the encoded file as a .avi'. As far as I know, umc_video_enc_con application produces raw video stream which is not packed into any format container. So, how do you save it as an AVI file?
Please also provide command line parameters and .PAR fileyou use to encode date with umc_video_enc_con application
from your parameters for simple_player I see that you use FileWriter render which designed to render to file. There are other renders which can render to screen, please pay attention to sample documentation.