Codec Error trying to insert an .flv file into PP slide By Diane McKeon First, I used Articulate Encoder to publish an .mp4 file to an .flv file. Then I opened my .pptx file and tried to insert (Insert/Video) the .flv file onto the slide. I received the error, "Powerpoint cannot insert a video from the selected file. Verify that the necessary codec for this media format is installed and try again." Help! I thought the point of using Encoder was that it would convert my .mp4 file into a format I could insert in PowerPoint.