This is the command oggSlideshow that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
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 useful with the Ken Burns effect (option -t kb). The pictures are
automatically "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>
...
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