SMIL Language

Tayeb Lemlouma

SMIL Content Adaptation for Embedded Devices


From SMIL to Video

The objective of this work is to allow managing and producing a video content from SMIL presentations. This is ideal for clients who can play only video and do not support SMIL. Another objective is to use the SMIL description to enable the generation of video content with added TV-based effects like: subtitling, TV and TV programs logo insertion, automatic languages translations, publicity effects, film credits, etc.

The use of the SMIL language enables the adaptability of the video content for different contexts. Consequently, from one SMIL presentation many videos can be generated for different preferences and capabilities: languages, content filtering, etc.


In the following, we give an example of video generation from the SMIL specification.

Here is the SMIL specification of the multimedia presentation
<region id="region_video" top="0" left="0" />
<region id="logo_zone" top="5" left="5" />
<region id="comment_zone" top="13" left="325" />
<region id="subtitling_zone" top="260" left="28" />
<region id="pub_zone" top="231" left="5" />

<video region="region_video" src="video.mpg"/>
<img region="logo_zone" src="LogoTV.gif" begin="0" end="30"/>
<img region="comment_zone" src="SMIL_presentation.gif" begin="3" end="8"/>
<img region="subtitling_zone" src="subtitle1.gif" begin="14.5" end="15.9"/>
<img region="subtitling_zone" src="subtitle2.gif" begin="15.9" end="17.5"/>
<img region="subtitling_zone" src="subtitle3.gif" begin="23.5" end="27"/>

<img region="comment_zone" src="SMIL_presentation.gif" begin="27" end="30"/>

<img region="pub_zone" src="inria.gif" begin="28.5" end="30"/>


The corresponding temporal presentation is given by the following graph.

The Temporal graph

As we can see, the SMIL specification given above indicates that the final presentation should include permanently a tv logo during all the whole video playing. A subtitling of the video is also described and other information are added.

Here are some screen shots from the generated video based on the SMIL specification.

screen shot 1Figure 1
screen shot 2Figure 2
screen shot 3Figure 3
screen shot 4Figure 4

- In Figure 1, we see the TV logo insertion which corresponds to SMIL line:
<img region="logo_zone" src="LogoTV.gif" begin="0" end="30"/>
As it is specified by the SMIL scenario, the logo (LogoTV.gif) is displayed in the same time as the original video and has the same duration (30 seconds) as the video.
- Figure 2 shows the apparition of another object. The object is displayed from 3 seconds to 8 seconds as it is shown by the following:
<img region="comment_zone" src="SMIL_presentation.gif" begin="3" end="8"/>
- Figure 3 and 4 shows the two subtitles specified by:
<img region="subtitling_zone" src="subtitle1.gif" begin="14.5" end="15.9"/>
<img region="subtitling_zone" src="subtitle2.gif" begin="15.9" end="17.5"/>

An example of the adaptation of the video using SMIL, can concern the subtitling language. In the SMIL specification, we can ensure the subtitling of the video in two different languages:

<img region="subtitling_zone" src="subtitle1.gif" begin="14.5" end="15.9" systemLanguage="fr"/>
<img region="subtitling_zone" src="subtitle11.gif" begin="14.5" end="15.9" systemLanguage="en"/>

If the client language is "en" (the client preferences are stored using UPS profiles), the content negotiation ends with the presentation described by:

<img region="subtitling_zone" src="subtitle1.gif" begin="14.5" end="15.9"/>

The following screen shot shows the video with the new client preferences:

screen shot 5

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