You can make a slideshow, without sound, in GIF format, or with sound in Flash format, etc.
However, if you want to publish your creations on YouTube, the file to be uploaded
has to be converted to video format.
YouTube info as follows:
"Uploading Your Videos to YouTube
You'll need to save the video in a format that YouTube can accept in order to upload.
Save your videos as either QuickTime .MOV, Windows .AVI, or .MPG files;
these are the most common formats and they work well within our system.
We specifically recommend the MPEG4 (Divx, Xvid) format at 640x480 resolution with MP3 audio.
Resizing your video to these specifications before uploading will help your clips look better on YouTube."
You can use Windows Movie Maker to put your pictures together.
You can import files with the following file name extensions into Windows Movie Maker to use in your project:
Audio files: .aif, .aifc, .aiff .asf, .au, .mp2, .mp3, .mpa, .snd, .wav, and .wma
Picture files: .bmp, .dib, .emf, .gif, .jfif, .jpe, .jpeg, .jpg, .png, .tif, .tiff, and .wmf
Video files: .asf, .avi, .m1v, .mp2, .mp2v, .mpe, .mpeg, .mpg, .mpv2, .wm, and .wmv
Edited, having regard to subsequent Post #3.
Edited by petewills , 06 July 2010 - 10:47 AM.