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Casual Articles - Mpeg Encoding - Compression for DVD
Assessment LinksMost of the time people look for information on the internet. Anyone who requires to find any data, specifications, options or general information just logs onto the internet and searches for products, information or choices. The internet is a vir
In the DVD authoring process certain functions have to happen on an I frame and as e
Obtaining business financing has always been challenging for small and mid size company owners. Traditional sources of financing, such as venture capital companies, angel investors or banks, provide financing that is hard to obtain and usually takes weeks - or months - to set u
So a DVD with 4.7 Gigabyte of storage will give us: 4700 / 30 = 156.6 seconds or 2.6 minutes of video playback.
Obviously some way of reducing the amount of data that needs to be stored on the disk is needed.
One way to compress the data stream is to analyse each frame and remove information that is repeated within the frame. This frame by frame compression is called JPEG. This might be ideal for individual frames but is not sufficient for movies. Jpeg looks best with compressions of 5:1 or less, even this will only give 13 minutes of video on a DVD.
A better method is to use MPEG compression. This works by taking the first frame and compressing it as above. This frame is still quite large as it contains most of the information about the frame, this is called the I frame. The next frame of picture information is compared to this I frame and only the difference is stored. There are two types of difference frames, B and P frames, B frames are bi-directional, and P frames are predictive. The fact is that B and P frames can be quitr small depending on the amount of movement within the picture information. Typically with MPEG we can realise cpmpression factors of upto 30:1.
The grouping of I, B and P frames is called a GOP structure (group of pictures) the default stucture of a GOP within a DVD is usually IBBPBBPBBPBBPBBI, 4 P frames within each I frame sequence, and 2 B frames between each P frame sequence. A GOP sequence of 16 will give a very good compression ratio and take up less disc space but may present problems as below.
In the DVD authoring process certain functions have to happen on an I frame and as ea
Profitable distribution of general merchandise to grocery and convenience stores depends on reliable sources. Wholesale to distributor warehouses, also known as cash and carry suppliers, are located in most major cities. With the right suppliers, you can buy wholesale and dist
One way to compress the data stream is to analyse each frame and remove information that is repeated within the frame. This frame by frame compression is called JPEG. This might be ideal for individual frames but is not sufficient for movies. Jpeg looks best with compressions of 5:1 or less, even this will only give 13 minutes of video on a DVD.
A better method is to use MPEG compression. This works by taking the first frame and compressing it as above. This frame is still quite large as it contains most of the information about the frame, this is called the I frame. The next frame of picture information is compared to this I frame and only the difference is stored. There are two types of difference frames, B and P frames, B frames are bi-directional, and P frames are predictive. The fact is that B and P frames can be quitr small depending on the amount of movement within the picture information. Typically with MPEG we can realise cpmpression factors of upto 30:1.
The grouping of I, B and P frames is called a GOP structure (group of pictures) the default stucture of a GOP within a DVD is usually IBBPBBPBBPBBPBBI, 4 P frames within each I frame sequence, and 2 B frames between each P frame sequence. A GOP sequence of 16 will give a very good compression ratio and take up less disc space but may present problems as below.
In the DVD authoring process certain functions have to happen on an I frame and as e
As the landscape in the conferences, seminars and meetings industry becomes more crowded and more competitive event planners are looking for more ways to make their event a unique experience for their attendees, vendors and other participants. I'd like to share one tip with yo
A better method is to use MPEG compression. This works by taking the first frame and compressing it as above. This frame is still quite large as it contains most of the information about the frame, this is called the I frame. The next frame of picture information is compared to this I frame and only the difference is stored. There are two types of difference frames, B and P frames, B frames are bi-directional, and P frames are predictive. The fact is that B and P frames can be quitr small depending on the amount of movement within the picture information. Typically with MPEG we can realise cpmpression factors of upto 30:1.
The grouping of I, B and P frames is called a GOP structure (group of pictures) the default stucture of a GOP within a DVD is usually IBBPBBPBBPBBPBBI, 4 P frames within each I frame sequence, and 2 B frames between each P frame sequence. A GOP sequence of 16 will give a very good compression ratio and take up less disc space but may present problems as below.
In the DVD authoring process certain functions have to happen on an I frame and as e
I have a client who is in a panic because sales are slow and one big customer appears to be re-trenching. When I asked, "Who buys your product? Why? Who are your competitors? How are you different, better and smarter than them?", my client was stuck.Before knowing
The grouping of I, B and P frames is called a GOP structure (group of pictures) the default stucture of a GOP within a DVD is usually IBBPBBPBBPBBPBBI, 4 P frames within each I frame sequence, and 2 B frames between each P frame sequence. A GOP sequence of 16 will give a very good compression ratio and take up less disc space but may present problems as below.
In the DVD authoring process certain functions have to happen on an I frame and as e
I don't know about you, but when I first entered the world of internet marketing I thought I could just submit my newly finished website to a few search engines, then sit back as the visitors flocked to my site.I imagined that people would arrive on my website, as if by
In the DVD authoring process certain functions have to happen on an I frame and as each GOP can only have one I frame then for some videos a smaller GOP structure is more flexible but take up more space. Foe example a chapter point has to happen on an I frame, if the GOP structure was 16 frames you might find the nearest I frame upto 8 frames away which might result in an inaccurate position to begin a new chapter.
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