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NAME

       oggSlideshow - creates slideshows from pictures

SYNOPSIS

       oggSlideshow [options] picture1 [ picture2 [...] ]

DESCRIPTION

       oggSlideshow  creates a theora video from a number of pictures in JPEG‐
       or PNG‐format with different visual effects.

OPTIONS

       -s     Sets the  size  of  the  video  frame.  The  size  is  given  as
              <width>x<height> The default size is set to 480x320.

              Example: -s 320x240

       -f     Sets  the frame rate of the video. This is given by the pictures
              per second. The default frame rate is 24 pictures per second.

              Example: -f 16

       -o     Sets the output file name of the created video. The default name
              is slideshow.ogv.

              Example: -o myShow.ogv

       -l     Sets  the  presentation time (length) of one picture. So if your
              have 10 pictures and specify a length of 10 seconds,  then  your
              overall video length is 1:40 (100 seconds).

              Example: -l 10

       -d     Sets  the  datarate  in  byte per seconds for the video encoder.
              This more meant to be a upper threshold.  So  the  file  may  be
              smaller than assumed.

              Example: -d 1024000

       -t     Sets the presentation type, as shown above. Actually types are:

              kb:
               Ken Burns effect (default)

              cf:
               Picture crossfade for changeover

              p:
               Plain picture presentation

              bl:
               Bluring at changeover

              Example: -t p

       -e     Enables  the  reframing.  In  case  a picture does not match the
              aspect ratio of the video frame, it  can  be  "reframed",  which
              means  black  borders  are inserted. This option is only usefull
              with the Ken Burns effect  (option  -t  kb).  The  pictures  are
              automaticaly  "reframed"  with  the other two slideshow types to
              match the aspect ratio.

              Example: -e

       -x     Overwrite an existing output file without warning.

       -r     Enables the resampling to a certain value. This is  really  only
              for  experts  and  may  not  be  available with newer version of
              oggSlideshow.

              To  understand  this  option  you  need   some   more   internal
              information:  The  picture  is  loaded  by  the  gd  lib. So the
              transformation from png or jpeg to a plain RGBA  is  done  here.
              The  second reason for using gd is the great resizing facilities
              as  pictures  are  often  much  bigger  than  the  video  frame.
              OggSlideshow  can  handle  pictures  from  0.5 to 2 times of the
              video frame width and height best, as it  uses  a  linear  pixel
              interpolation.  With  the  resizing  feature of gd, oggSlideshow
              reads pictures with a size "near" to the video output  size  and
              can  then  operate  with that picture. This produces a very good
              quality output, as you can see above.

              The value given with this option is the factor  the  picture  is
              read in in respect of the video frame size. When the video frame
              size is 320x240 and the resample factor is 1.2 than the  picture
              that  is read is resized to 384x288. Specially for the ken burns
              effect this is important as the sliding is  done  on  a  picture
              bigger than the video frame size.

EXAMPLE

       oggSlideshow    -l3   -tp   -d1024000   -s480x320   -o   demo-plain.ogv
       <picture1.jpg> <picture2.jpg> ...

AUTHOR

       Joern Seger <yorn at gmx dot net>

SEE ALSO

       oggCut(1),   oggCat(1),   oggJoin(1),   oggSplit(1),   oggTranscode(1),
       oggThumb(1), oggSilence(1)



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