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Door , , 1 reactie
Bron: AnandTech

Anand heeft een review in elkaar geschroefd van de net uitgebrachte Matrox Marvel G400TV. Hier heb je wat info over de hardware MJPEG encoder, lees de rest hier.

The major selling point for the Marvel G200 was the fact that it didnít simply include a software MPEG2 encoder for video. Instead it used a hardware MJPEG encoder for true to source video capture. This Hardware MJPEG support is once again provided for on the Marvel G400 courtesy of the on-board Zoran ZR36060PQC.

For a card retailing at $300 there is no way to provide support for hardware MPEG2 video capture and editing with the current technology. Instead of offering a software MPEG2 video capture/editing solution Matrox decided to stick to their guns and continue, in their opinion to use the next best thing, hardware MJPEG. Hardware MJPEG is not as efficient as MPEG2 compression but a hardware MPEG2 codec on a sub $300 enthusiast's card is not a reality we can enjoy.

In terms of efficiency, MJPEG loses out in the amount of disk space needed to hold a single second of video at NTSC or PAL resolutions at 30 fps with no visible loss in quality or drop in frames. At 704 x 480 (NTSC) at ~30 fps (29.9 fps) -- otherwise known as D1 resolution (full NTSC or full PAL resolution) -- the data rate required by the MJPEG codec as approximately 3MB per second. To capture a 30 second commercial would require 90MB of disk space, and a 30 minute TV program would require a hefty 5.4GB of space. For a product directed at home users, there are some steep storage requirements to get the quality Matrox is boasting for the Marvel G400. Of course you don't have to opt for the highest image quality (which you probably wonít considering that 50GB hard drives aren't common place just yet) in which case the MJPEG codec isn't too bad but it is still quite a disk space hog.

Meer info over al de video-editing features staan hier.

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Reacties (1)

G400 marvel leverbaar vanaf juli 2002 ??

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