MP800 UHD Media Player Manual
Page
44
of
45
Rev. 100- 10/17/16
Browser Layer Design Guidelines
1.
This browser is standards-compliant and should correctly interpret all but most exotic CSS and JavaScript
syntax.
2.
Try keeping the total uncompressed size of images including those that are not visible at the moment, or
downloaded using JavaScript under 2 MB. Avoid complicated page structures (deeply nested tables, etc.),
and keep formatting simple.
3.
Avoid resizing images in HTML, CSS or JavaScript by specifying width and height. This will increase
memory usage. Specifying width/height is OK only if the dimensions are exactly equal to the natural
dimensions of the image.
4.
When designing dynamic effects, keep in mind performance limitations. We found that moving large
bitmaps or text across the screen (marquee) is either slow or not smooth. However, image and text rotators
seem to work fine.
5.
When manipulating objects (especially images) in JavaScript, release the buffer (MyImg.src=””) or make
sure that the object goes out of scope when no longer needed. Some techniques, like preloading images one
at a time in image rotators shortly before use, and releasing shortly afterwards may be helpful.
6.
When developing playlists, allow enough time to load websites, especially when video is being played
concurrently. When navigating from a web page to another web page, allow some time for the previous page
to unload. For large, complicated pages both loading and unloading may take several seconds each.
Recommended time between page changes is 10 minutes depending on the complexity of the page being
displayed.
7.
Page dimensions should not exceed displayed dimensions (typically 1366x768, 1024x768, etc).
8.
Pages should be developed specifically for the MP800 family as the browser limitations make displaying
generic web pages unpredictable.
9.
When using active JavaScript, try not to change to other pages. As the JavaScript is running and is
asynchronous to running playlists, information may be loaded/unloaded at any time; therefore, a playlist
should not change the actively displayed web page. This can however be handled in the JavaScript since it
controls loading/unloading of objects, etc.
10.
When using a multilayer display, video bandwidth needs to be reduced. The recommendation currently is
MPEG-2 MP@HL running at 20Mbps or lower.
11.
Avoid using H.264 in layering mode. The Memory bandwidth required to process H.264 HD is very high
and causes memory limitations for other intense applications such as the Browser to function correctly.
12.
When spawning a Video, or picture from the Browser JavaScript always use “?internal=1” as an option in
the video execution line.
13.
Macromedia Flash is
not
supported.
