Introduction to Video Files
The video format that we use this term is digital video, the older format that we used to use was analog but as technology progresses everything is digital.
Analog signals use continuous varying wave forms that can be anywhere between the minimum and maximum points at any given time. Digital signals are only transmitted at precise points selected at particular intervals.
Some advantages of digital video is that digital video is more trustworthy and can complete jobs in a more efficient and easier way. For e.g. with digital it is much easier for the receiving end to distinguish between each noise. Noise might be electrical interference or static in the microphone. This is because digital uses the binary system using the numbers ‘1’ or ‘0’. It is much simpler than analog because analog can misinterpret the noise it can be any noise to analog as it does not use the binary system and it just makes an estimate. Also digital can check the message that was sent and how it was received and if there are any errors whilst analog is unable to do that.
Frame rate in video means the number of pictures shown per second. 10 frames per second make the video seem smooth to the human eye whilst anything under seems jerky. The higher the frame rate the smoother the playback.
Not all applications use the same frame rate. For e.g. in the theatre, movies normally use a frame rate of about 24 frames per second. Whilst things on television use a rate of about 30 frames per second. It really depends on which country you live in and the video quality that is used there.
Resolution is another factor that relates to the quality of an image. It is measured by the number of pixels horizontally multiplied by the number of pixels vertically. The higher the resolution the better the quality of the image.
The colour system called RGB means red, green and blue colours. The computer monitor displays these colours. In fact each pixel is made up of red, green and blue phosphate but these primary colours are so close together that when we look at them they are blended together and it looks like a single coloured dot. These colour components are normally called channels of a computer image. The computer usually stores the information for the red, green and blue colours with 8 bits for each colour. With 24 bits of information over a million different variations of colour can be produced from each pixel.
PAL, SECAM and NTSC are the 3 TV standards in use around the world. They all have standards for different countries normally when you buy a TV in your own country then they will conform to the standards of that country. You can translate between the various standards but the quality won’t be as good because of the differences in frame rate and resolution. The difference between them is that each standard is used in particular countries. The horizontal lines or the resolution and the frame rate.
In Australia we use the standard PAL.
The type of camera that you would need to have a Video Capture Card in your computer is and analog camera(video tape)
We do not need a Video Capture Card for what we are doing at school because we are using digital cameras. They already translate what they record into digital format inside the camera, whilst with an analog video you need a Video Capture Card to digitalize it so it can de read by the computer.
In basic forms an IEEE 1394 is a way of transferring data from the camcorder to your computer. It doesn’t really capture video just transfers. It can also be used as a transfer for other things as well. E.g. hard drives, scanners and networking.
Video Cameras use compression so they can store a lot more things while uncompressed they wouldn’t be able to store as much because it is a lot larger.
A codec compresses and decompresses the video. They are found in hardware such as capture cards or DVD camcorders or they can be found in software. Some have a fixed data rate and some have a wide range of data rate. It is very useful for editing your video.
Generation loss is when for example if you make a photocopy of a photocopy of a photocopy the quality will be really bad, but with a DV mixed with your digital computer if you make a copy of a copy of a copy of a copy of a copy of a copy and so on and so forth then the quality will be just as good as the original.
The video format that we use this term is digital video, the older format that we used to use was analog but as technology progresses everything is digital.
Analog signals use continuous varying wave forms that can be anywhere between the minimum and maximum points at any given time. Digital signals are only transmitted at precise points selected at particular intervals.
Some advantages of digital video is that digital video is more trustworthy and can complete jobs in a more efficient and easier way. For e.g. with digital it is much easier for the receiving end to distinguish between each noise. Noise might be electrical interference or static in the microphone. This is because digital uses the binary system using the numbers ‘1’ or ‘0’. It is much simpler than analog because analog can misinterpret the noise it can be any noise to analog as it does not use the binary system and it just makes an estimate. Also digital can check the message that was sent and how it was received and if there are any errors whilst analog is unable to do that.
Frame rate in video means the number of pictures shown per second. 10 frames per second make the video seem smooth to the human eye whilst anything under seems jerky. The higher the frame rate the smoother the playback.
Not all applications use the same frame rate. For e.g. in the theatre, movies normally use a frame rate of about 24 frames per second. Whilst things on television use a rate of about 30 frames per second. It really depends on which country you live in and the video quality that is used there.
Resolution is another factor that relates to the quality of an image. It is measured by the number of pixels horizontally multiplied by the number of pixels vertically. The higher the resolution the better the quality of the image.
The colour system called RGB means red, green and blue colours. The computer monitor displays these colours. In fact each pixel is made up of red, green and blue phosphate but these primary colours are so close together that when we look at them they are blended together and it looks like a single coloured dot. These colour components are normally called channels of a computer image. The computer usually stores the information for the red, green and blue colours with 8 bits for each colour. With 24 bits of information over a million different variations of colour can be produced from each pixel.
PAL, SECAM and NTSC are the 3 TV standards in use around the world. They all have standards for different countries normally when you buy a TV in your own country then they will conform to the standards of that country. You can translate between the various standards but the quality won’t be as good because of the differences in frame rate and resolution. The difference between them is that each standard is used in particular countries. The horizontal lines or the resolution and the frame rate.
In Australia we use the standard PAL.
The type of camera that you would need to have a Video Capture Card in your computer is and analog camera(video tape)
We do not need a Video Capture Card for what we are doing at school because we are using digital cameras. They already translate what they record into digital format inside the camera, whilst with an analog video you need a Video Capture Card to digitalize it so it can de read by the computer.
In basic forms an IEEE 1394 is a way of transferring data from the camcorder to your computer. It doesn’t really capture video just transfers. It can also be used as a transfer for other things as well. E.g. hard drives, scanners and networking.
Video Cameras use compression so they can store a lot more things while uncompressed they wouldn’t be able to store as much because it is a lot larger.
A codec compresses and decompresses the video. They are found in hardware such as capture cards or DVD camcorders or they can be found in software. Some have a fixed data rate and some have a wide range of data rate. It is very useful for editing your video.
Generation loss is when for example if you make a photocopy of a photocopy of a photocopy the quality will be really bad, but with a DV mixed with your digital computer if you make a copy of a copy of a copy of a copy of a copy of a copy and so on and so forth then the quality will be just as good as the original.
