<p>Although what gushie said is true sometimes you have to trick openlp into thinking its playing a certain format in order to play another.</p>
<p>For example I needed to play a .flv file. Widows media player cant play this unless you have a codec for it so I found K-Lite Mega Codec Pack on google and installed it. This allowed windows media player to play not only .flv but tons of other formats as well. This still didnt solve my problem though. Openlp only allows you to add videos with .avi, .mpeg, .mpg, .m1v, .mp2, .mpa, .mpe, .mov, .divx, .wmv, .asf extensions. So even though widows media player can now play a .flv format I cant add it to openlp. So what I did was change the extesion of the .flv video to .avi and then added it to openlp. It worked with no problems. Now I cant say this will work for every format but its worth a shot. And by the way the codec pack is free.</p>