I just discovered this problem. I make video files using Corel VideoStudio Pro X2 and save them as MPEG (.mpg) files and store them in My Videos folder in my computer. I upload these files to YouTube and they ALWAYS play normally without any problem. (As of this moment, I have 75 videos in YouTube).
Today, I was trying to watch them in my computer using Windows Media Player 11. Some of the files are playing normally (both audio and video part), but in SOME only the audio is playing but no video (black screen). These are ALL made in the same way, saved in MPEG format, made by the same software ... basically they are all same kind of files. They, of course, are playing in Corel (the software used to create them) and also in another media player called Final Media Player.
I tested WMP in various ways ... played other videos with it and also DVDs (both commercially made and home made by me using the above named Corel software). Everything seems fine. So why it is not playing SOME of my video files created exactly the same way as others?
I tried to research in the mind boggling land of "Codecs". I, of course, don't understand much of the technicalities of the Codecs, Decoders and stuff, but I discovered an utility called "Sherlock" created by a Microsoft MVP engineer. With this amazingly easy to use utility I printed out a 11-page long list of audio and video codecs installed in my computer, in case some Codec Expert wants to know if I have a particular codec installed in my system. The utility says if a particular codec is damaged or out of date, it will notify me in RED. There is not a single red in my 11-page long list!!! Since the list is long, I am not including it here. If any expert in this forum wants to see it, I can e-mail it to him/her.
Any thought anybody?