Posted: Wed Oct 25, 2006 9:11 pm
A common misconception is that there are two video formats
AVI & MPEG.
Problem is that is all very misleading. I suppose you could call AVI as being uncompressed video gobbling a massive 65GB per hour.
AVI is shorthand for Audio Video Interleaved.
Instead the boffins came up with various methods to compress these huge files into something smaller and more manageable. When you compress a file you also need something else to decompress it back.
This is termed a codec. COmpression / DECompression.
I haven't counted how many there are but I wouldn't be surprised if it ran into a hundred or more.
The one most widely used for video editing purposes is termed DV
This gobbles a mere 13GB per hour and comes in two formats
Type 1: The Video and Audio are combined.
Type 2: The Video is separated from the audio sort of like stereo.
There are currently 3 popular 'AVI' formats which are extrememly highly compressed but retain high quality and so are popular formats for sharing video over the internet - such as the films and TV Programs being made available by the Television Companies.
DivX
Xvid
MPEG4
These formats are also starting to appear in some camcorders.
The problem though is that due to the high level of compression they are difficult and sometimes almost impossible to edit. This can often be overcome by 'decompressing' them into the more flexible DV format.
Now if that isn't problematic enough these so called AVI formats are not DVD compliant. they have to be converted yet again into MPEG2 format.
Here again we have a problem because MPEG2 can take on a variety of bit rates and screen sizes. Not everyone chooses to place their video files onto a DVD disc and may have good reason for choosing a MPEG2 format that is not DVD compliant.
DVD VOB files are more or less MPEG2 files with some extra information.
You can often treat a VOB file as a MPEG2 file by simply renaming the extension to MPG.
For some suggested DVD compliant MPEG2 settings please view:
http://phpbb.ulead.com.tw/EN/viewtopic. ... 6707#56707
If you need to convert 'avi' files into DV format there is a free converter listed in this link:
http://phpbb.ulead.com.tw/EN/viewtopic.php?t=12931
Or you can Google for others.
AVI & MPEG.
Problem is that is all very misleading. I suppose you could call AVI as being uncompressed video gobbling a massive 65GB per hour.
AVI is shorthand for Audio Video Interleaved.
Instead the boffins came up with various methods to compress these huge files into something smaller and more manageable. When you compress a file you also need something else to decompress it back.
This is termed a codec. COmpression / DECompression.
I haven't counted how many there are but I wouldn't be surprised if it ran into a hundred or more.
The one most widely used for video editing purposes is termed DV
This gobbles a mere 13GB per hour and comes in two formats
Type 1: The Video and Audio are combined.
Type 2: The Video is separated from the audio sort of like stereo.
There are currently 3 popular 'AVI' formats which are extrememly highly compressed but retain high quality and so are popular formats for sharing video over the internet - such as the films and TV Programs being made available by the Television Companies.
DivX
Xvid
MPEG4
These formats are also starting to appear in some camcorders.
The problem though is that due to the high level of compression they are difficult and sometimes almost impossible to edit. This can often be overcome by 'decompressing' them into the more flexible DV format.
Now if that isn't problematic enough these so called AVI formats are not DVD compliant. they have to be converted yet again into MPEG2 format.
Here again we have a problem because MPEG2 can take on a variety of bit rates and screen sizes. Not everyone chooses to place their video files onto a DVD disc and may have good reason for choosing a MPEG2 format that is not DVD compliant.
DVD VOB files are more or less MPEG2 files with some extra information.
You can often treat a VOB file as a MPEG2 file by simply renaming the extension to MPG.
For some suggested DVD compliant MPEG2 settings please view:
http://phpbb.ulead.com.tw/EN/viewtopic. ... 6707#56707
If you need to convert 'avi' files into DV format there is a free converter listed in this link:
http://phpbb.ulead.com.tw/EN/viewtopic.php?t=12931
Or you can Google for others.