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:

• PAL is effective in all the countries where the electricity network is 50 hz (what is the case for example for Western European countries)
• NTSC is effective in all the countries where the electricity network is 60 hz (what is the case for example for United States of America)

Geometry

The geometry corresponds to the ratio of Width to Height.

• 4:3 corresponds to screens that are almost square
• 16:9 corresponds to screens that are rectangular
• 40:17 corresponds to cinema screens in overall size

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:

• More images per second and the eye does not notice it
• Fewer images per second and the film appears jerky

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	Geométry	PAL		NTSC		Remark
		Resolution	FPS	Resolution	FPS
RIM 240	4:3	240x180	24 FPS	240x180	24 FPS	Special format used on Blackberry 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 equipments with oval points: It is the anamorphism of the points that determines the geometry. That is why, It is absolutely necessary to ban the use of 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.