Standards and resolution are both fundamental properties which define a video.
Two associated properties are the geometry and the FPS number.

Standard

Standards are a historic feature which continues today in spite of technological progress.
A rich literature on this subject can be found on the internet.
To simplify things we shall summarize as follows:

Geometry

The geometry is the ratio of Width to Height.

Resolution

Unlike with photos, video resolution is not expressed in megapixels but in number of points (pixels) shown by the screen multiplied by the number of lines.
So, 320x240 corresponds to 320 points of width and 240 lines in height

FPS (Frames per second)

Corresponds to the number of images shown every second. You should know that in cinemas, 24 images are shown per second and this figure of 24 images is recognized as corresponding to the maximum number of images which the eye is capable of differentiating:

Matrix of combinations managed by ffDiaporama

The following table indicates all the combinations of geometry, standards and resolutions managed by ffDiaporama. For every combination, it indicates the number of associated FPS:
Name Geometry PAL NTSC Remark
Resolution FPS Resolution FPS
RIM 240 4:3 240x180 24 FPS 240x180 24 FPS Special format used on Blackberry's very small screen
6:9 240x136 240x136
40:17
QVGA 4:3 320x240 25 FPS 320x240 29,97 FPS Used mainly on the Internet and by first generation smartphones and mobile video players.
16:9 320x180 320x180
40:17 320x136 320x136
HVGA 4:3 426x320 426x320 Used mainly on the Internet and by second generation smartphones and mobile video players. Because this format does not respect the traditional video geometry, black bands appear to fill the screen to 480x320.
16:9 480x270 480x270
40:17 480x204 480x204
VGA 4:3 640x480 640x480 Used mainly on the Internet and by some smartphones.
16:9 640x360 640x360
40:17 640x272 640x272
SD-DVD 4:3 720x576 720x480 The old television format for cathode ray tubes. Note that this format was specifically created for equipment with oval points: It is the anamorphism of the points that determines the geometry. That is why it is absolutely necessary to avoid this format for anything other than television sets with cathode ray tubes.
16:9
40:17
WVGA 4:3 640x480 640x480 Used mainly on the Internet and by new generation smartphones and mobile video players. This format has become widespread and has replaced the old  QVGA, HVGA and VGA format used in the years 2000-2010. Because this format does not respect the traditional video geometries, black bands appear to fill the screen to 800x480.
16:9 800x450 800x450
40:17 800x340 800x340
XGA 4:3 1024x768 1024x768 Historically this format was used only by computers (fixed or portable). Now we meet it more and more on tablet computers like the iPad.
16:9 1024x576 1024x576
40:17 1024x436 1024x436
720p 4:3 960x720 960x720 23,976 FPS Today, this format is widely used on the Internet, in particular by social networking and video-sharing sites. We also find it on certain "home cinema" devices.
16:9 1280x720 1280x720
40:17 1280x544 1280x544
1080p 4:3 1440x1080 1440x1080 This is the real "home cinema" format. It is used by the Blue Ray players and the "home cinema" devices.
16:9 1920x1080 1920x1080
40:17 1920x816 1920x816

Note that many other resolutions exists but which are not used by ffDiaporama.