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Operating Manual MA VPU V 6.0

MA Lighting Technology GmbH Dachdeckerstr. 16 D-97297 Waldbüttelbrunn www.malighting.dePage 138

15 Content Specifications

General Note:

About MPEG-2:

MPEG stand

standards. One important one is the MPEG-1/2 (ISO/IEC 13818-part x) standard which will

be used for the MA VPU. As opposed to MPEG4 this standard keeps a good balance

between file size and calculation power that is needed to decode the video information.

The MPEG2 standard allows a couple of settings which will highly influence the quality of the

picture and the way the VPU handles this data. They are defined to be able to run several

resolutions like full HD for example. That influences also the bit rate which can vary from

approx. 3 to over 80 Mbit/s. The higher the bit rates the more workload for the CPU, RAM &

so on. Because of that MA Lighting choose settings that form a good compromise between

bit rate and resulting framerate.

To gain safe and proper performance with the VPU, we strongly encourage encoding any

content as described here. Nonlinear Video Editing Systems and Compositing Tools such as

Avid Composer / Adobe Premiere Pro / Adobe After Effects / Final Cut Pro do also feature

high quality MPEG2 encoding tools that are very versatile and produce MPEG2 conform

content. However: you have to test this content with the VPU for correct and stable

performance before doing a production with this content.

If you do not know the origin and quality of the MPEG2 encodings of your content, we

strongly encourage you to re-encode the complete material even if you are afraid of slightly

visible artefacts. If you want to gain the best quality, use un-encoded raw video and audio

material as the source.

Since Main Concept Reference can be downloaded for free to do test encodings (watermark

is inserted into the video and audio is cut off after 30 seconds in the trial version), you can

also use that tool to check your content by re-encoding it in case of problems related to

content issues.

Video codecs other than MPEG2 are not installed on a VPU and not supported by MA

Lighting. Former grandMA video dongle users that install the VPU software on their system

should use a clean system and not install any other codec than the MPEG2 Decoder Pack.

You cannot gain high performance of parallel video stream decoding with guaranteed

performance with not conforming and correct encoded content.

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Ulead MEDIASTUDIO PRO 8.0 - SMART COMPOSITOR DESIGNER Dokumentacja Strona 138