I've experimented quite a bit with the multimedia aspect of Irfanview in this latest version. Suprisingly this was also true of playing video files as well. Video files can be viewed at normal size, double size or full screen. However, bear in mind that the clarity of the video at double size or full screen strictly depends on the quality of the video. Resizing images is simple.
Size can be halfed or doubled after a user makes a choice frpm the above selections.
I personally found that Best Fit to Desktop is an ideal choice as it alters the image slightly with a minimal of distortion. No playlist available for sound files. Other users' experiences may differ. It should be noted that due to the wide range of systems used, I cannot guarantee how this software will perform on your computer. Used under License.