Cayin SMP-PRO4 Wiedergabehandbuch - Seite 8

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CAYIN SMP Player Video Playback Guide

4. Other Factors to Influence the Media Player

While reading video files or receiving network streaming, a media player needs to decode it

first and then display it on a screen. The process is very complicated and requires the right

combination of resources, including hardware, software and system capabilities. For example,

the CPU is responsible for decoding and other operations, while memory provides the storage

spaces needed before and after the decode. Graphic chips support the draw to the screen

display. The special hardware design of graphic chips offloads decoding and outputting images

to free up CPU resources. However, these hardware components are also used by other

non‐video playback programs simultaneously. Therefore, depending on allocated hardware,

software and system resources, these can determine and affect the video playback quality.

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Screen Resolution of SMP Players

When a media player completes decompressing video, each video frame will be restored

to its original image data and the media player will draw images into a specific area of

"window" through X‐Window system's API and graphic driver. Then, the graphic IC will

transmit such information to the screen through a display port, such as VGA or DVI. The

computing power of the graphic IC and driver will determine the efficiency of the above

process when a media player plays back video.

Generally speaking, the higher the screen resolution is, the more time the graphic chip

will take to process. Thus, if you increase the screen resolution, the performance of the

graphic IC may drop down. However, thanks to the evolution of graphic chip design, this

issue is becoming less obvious for new graphic ICs. For example, high screen resolutions

(e.g., 1920 x 1080) have little impact on SMP‐WEBDUO's performance. However, since it

still takes more CPU resources and more memory to process for high screen resolutions,

we still recommend using systems with higher performance.

In digital signage's application, you might not playback full‐screen video all the time. Thus,

when video is only part of the elements composed on the display, the smaller the video

area is, the lesser resources the system needs to consume. That equates to smoother

video playback or higher bit rate.

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Portrait Mode

SMP‐WEB4, SMP‐PRO4, SMP‐WEBPLUS, SMP‐PROPLUS, and SMP‐WEBDUO all support

portrait mode, which means to rotate the screen 90 or 270 degrees. Since the

communication protocols between a display and a device (PC) do not have a so‐called

"rotation mode", all output signals need to be processed by the device before they can

actually be displayed on the screen. This means the graphic driver needs to calculate and

relocate memory so that users can see the portrait mode after the processed signals are

outputted on the screen. Compared to the landscape mode, such an extra processing

workload in portrait mode will reduce the display and playback performance.