Hi
Back when I was a wee laddie, I used to think "Quicktime format was their own compression, encoding, headers, and the like" as was WMA/V, DivX, etc.
...but then I noticed that Quicktime lets you "use" MPEG4, H.264, and the like. So now I'm confuzzled.
So what exactly "is" the quicktime format, and how does it compare to WMA/V, DivX etc when they all "support" H.264.
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W3bbo
Work hard; increase production; prevent accidents, and be happy.
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mVPstar
I'm white because I smelt an onion.
I think of the Quicktime format as merely a "container" that holds video of different compression/quality. Perhaps a standard/framework in itself which codecs made for Quicktime have to adhere to.
WMV is a format and a technology/codec on its own, handling its own compression.
DivX is a codec I believe.
mVPstar -
Most codecs are a modification of MPEG (2, or 4) and of AVI in most cases too.
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Sven Groot
Don't worry... I'm a doctor.
Manip wrote:Most codecs are a modification of MPEG (2, or 4) and of AVI in most cases too.
AVI's not a codec, it too is just a container. Commonly used codecs include Intel Indeo and nowadays more common, DivX.
EDIT: To answer the original question:
http://en.wikipedia.org/wiki/QuickTime#QuickTime_file_format -
Sven Groot wrote:
Manip wrote: Most codecs are a modification of MPEG (2, or 4) and of AVI in most cases too.
AVI's not a codec, it too is just a container.
Right, and in most cases containers are based on a modified AVI format.
DivX is based on MPEG 4 version 2. -
Sven Groot
Don't worry... I'm a doctor.
Manip wrote:
Sven Groot wrote: Manip wrote: Most codecs are a modification of MPEG (2, or 4) and of AVI in most cases too.
AVI's not a codec, it too is just a container.
Right, and in most cases containers are based on a modified AVI format.
DivX is based on MPEG 4 version 2.
Yep, DivX is a rewrite of DivX
which was a hacked version of the Microsoft MP4 codec. Quicktime videos also tend to use an MP4 based codec.
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W3bbo
Work hard; increase production; prevent accidents, and be happy.
What about Xvid and 3vid (spelling?)?
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Xvid (from xvid.org)
XviD is an ISO MPEG-4 compliant video codec, so designed to compress/decompress digital video. It's a open source project, which is developed and maintained by a handful of skilled and interested engineers from all over the world.
3ivx (from 3ivx.com)
3ivx is an MPEG-4 toolkit that supports MPEG-4 Video, MPEG-4 Audio and the MP4 File Format. Around these 3 Technology Cores (Video, Audio and File Format) various front-ends have been built. A front-end is a shell around a core. The core communicates with the user through a front-end. Examples of front-ends include DirectShow Filters, QuickTime Components and Video for Windows codecs. -
In the past, when QT "was it", for the net (and IMO still is), it had the Sorenson codec, which was QT only, and was pretty sharp about compressing. This was a long time ago though.
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mVPstar wrote:I think of the Quicktime format as merely a "container" that holds video of different compression/quality. Perhaps a standard/framework in itself which codecs made for Quicktime have to adhere to.
WMV is a format and a technology/codec on its own, handling its own compression.
DivX is a codec I believe.
mVPstar
WMV files are WMV data wrapped in an ASF file format, I believe.
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