[Mp4-tech] IBM BatchXMT file format

[Michelle Y Kim]

You are not limited by XmtBatch to use only .cmp (or m4v), which are just 
raw bitstreams as created typically by reference software. You can refer 
to media content directly from a track in another mp4 file. To refer to a 
track just append #video (or #audio if its an audio track you want) after 
the file name e.g. "myfile.mp4#video". If there is more than one track of 
a given type you can do "myfile.mp4#video(2)" which will use the second 
video track it finds. Hence "myfile.mp4#video" is equivalent to explicitly 
specifying the first video track using  "myfile.mp4#video(1)". You can 
find other posts about using #video etc on the alphaworks forum for the 
IBM Toolkit for MPEG-4.
In XMT-O <video> and <image> are specified to be converted into MPEG-4 
using a Bitmap geometry node. This geometry is unlike most others and is 
explicitly stated that it cannot be rotated. However video can be achieved 
another way which is to use a <texture>  and texture a geometry such as a 
<rectangle> as in the following example. You can make the size of the 
rectangle the same as the video.
  <rectangle size="320 240">
     <transformation>
        <animate  id="sdlfkj"   dur="5s" repeatDur="indefinite"
           attributeName="rotation" from="0deg" to="180deg"
           calcMode="linear" />
        <animate  id="cmov2"    dur="5s" repeatDur="indefinite"
           attributeName="scale"
           from="1.0 1.0"     to="5.0 5.0"/>
     </transformation>
     <texture src="../multimedia/myvideofile.mp4#video" />
  </rectangle> 
Regards,
  Michelle
  Dr. Michelle Y. Kim, IBM T. J. Watson Research Center
  Manager, Composite Media Technologies Group
  mykim us.ibm.com (e-mail)
  (914) 784-7709 (voice)
  (914) 784-7455 (fax)
Andreas Åkre Solberg <video solweb.no>
Sent by: mp4-tech-bounces lists.mpegif.org
12/03/2024 10:51 AM
        To:     mp4-tech lists.mpegif.org
        cc: 
        Subject:        [Mp4-tech] IBM BatchXMT file format
I am playing with the IBM BatchXMT tool for creating mp4 files from 
XMT-O scene descriptions. In the samples I downloaded the XMT files 
refer to .cmp video files. I tried to include one of my own mp4 files 
(created from qt pro), but without success. Do I need to convert them 
to the .cmp format, in that case; what is the .cmp file format, and how 
do I convert to it?
I also have problems scaling and rotating videos with the same tools. I 
have tried the following code:
<video dur="media" src="../multimedia/videofile.cmp">
     <transformation>
     <animate  id="sdlfkj"   dur="5s" repeatDur="indefinite"
         attributeName="rotation" from="0deg" to="180deg" 
calcMode="linear" />
     <animate  id="cmov2"    dur="5s" repeatDur="indefinite" 
attributeName="scale"
         from="1.0 1.0"     to="5.0 5.0"/>
     </transformation>
</video>
The same code works for rotating circles and rectangles.
Regards,
Andreas
--
Andreas Åkre Solberg, Telematikk NTNU
http://www.item.ntnu.no/~andrs - andrs item.ntnu.no
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