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<title> Linux Video Stream Processing Tool - Examples</title>
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<td align="left" bgcolor="#e9e9e9"> <FONT
FACE="Lucida,Helvetica"> <font>Subtitles:
</font>
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<td>
This chapter gives a short introduction on handling and
processing subtitles with transcode and related programs.
<ul>
<li> <a href="#extsub"> <FONT FACE="Lucida,Helvetica">
DVD subtitle overlay mode with <i> -J extsub</i></font></a> <p>
<li> <a href="#subrip"><FONT FACE="Lucida,Helvetica">
generating subtitle files with <i>subrip</i></font></a><p>
<li> <a href="#subtitler"><FONT FACE="Lucida,Helvetica">
adding custom subtitles with <i> -J subtitler</i></font></a><p>
</ul>
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<a name=extsub></a>
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<font> DVD subtitle overlay mode </font>
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<td>
transcode provides a filter plugin <i> filter_extsub.so</i> for elementary DVD
subtitle rendering in connection with <i>-x vob</i>. Use it with<p>
<table>
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<td align=left valign="top" bgcolor="#ccffcc">
transcode [...] -J extsub=<options></td>
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</table><p>
The option string looks as follows (all options default to 0): <p>
<table>
<tr>
<td align=left valign="top" bgcolor="#ccffcc">
s:h:t:f:w:a:b:p:q
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</table><p>
<ul>
<li> s subtitle track id (0-31)<br>
Use <i>tcprobe -H N</i> with N>1 to find out
if subtitle any packs are available in the program stream.<p>
<li> h offset of subtitle with respect to bottom
of frame in rows.<br>
Subtitles are placed at the bottom of the
frame. Try this option to shift them up or down.<p>
<li> t global display start time correction
in msec.<br>
If you feel, subtitles are displayed not timely,
adjust it with this option. This will affect all subtitles.<p>
<li> f fast rendering, i.e., no anti-aliasing (0=off,1=on).<br>
Anti-aliasing of the font is performed by
default. Switch it of (1) if your font is tiny
and messed up by this feature.<p>
<li> w render on post-processing (0=off,
1=on).<br>
Setting this option to 1 will render the
subtitle on post-processing instead of pre-processing.
This may improve subtitle quality but makes no
sense after extensive resizing of the frame.<p>
<li> a graylevel value a (0-255).
<li> b graylevel value b (0-255).<br>
Make another subtitle color visible with full
intensity equal to 255. May lead to fatter fonts.<p>
<li> p assign subtitle color p [0-3] to
graylevel value a.
<li> q assign subtitle color q [0-3] to graylevel value b.<br>
Shuffle the color assignment by choosing another
subtitle color between 0 and 3. Useful for black fonts on white background.<p>
</ul>
<p>
Example (1) changing color assignment:
<ul>
<li>
<table>
<tr>
<td align=left valign="top" bgcolor="#ccffcc">
-J extsub
</tr>
</table>
this one looks not as expected without any further options.
<p>
<img align="top" src="mes0-00000.png"> <p>
<li>
<table>
<tr>
<td align=left valign="top" bgcolor="#ccffcc">
-J extsub=0:0:0:0:0:0:0:1:2
</tr>
</table>
shuffle the font color assignment
using 1:2 looks like this, but has an ugly 3D effect.
<p>
<img align="top" src="mes4-00000.png"> <p>
<li>
<table>
<tr>
<td align=left valign="top" bgcolor="#ccffcc">
-J extsub=0:0:0:0:0:0:0:1:3
</tr>
</table>
shuffle the color assignment using 1:3 looks better,
but shows white shadows that make the font fatter but blurry
<p>
<img align="top" src="mes5-00000.png"> <p>
<li>
<table>
<tr>
<td align=left valign="top" bgcolor="#ccffcc">
-J extsub=0:0:0:0:0:0:0:2:3
</tr>
</table>
shuffle the color assignment using 2:3 seems to be perfect.
Nice and smooth looking letters.
<p>
<img align="top" src="mes6-00000.png"> <p>
<li>
<table>
<tr>
<td align=left valign="top" bgcolor="#ccffcc">
-J extsub=0:0:0:1:0:0:0:2:3
</tr>
</table>
for comparison, we switch off anti-aliasing, see the difference?
<p>
<img align="top" src="mes7-00000.png"> <p>
</ul>
Example (2) adding another white color:
<ul>
<li>
<table>
<tr>
<td align=left valign="top" bgcolor="#ccffcc">
-J extsub
</tr>
</table>
this one looks already perfect without any options.
<p>
<img align="top" src="sub0-00000.png"> <p>
<li>
<table>
<tr>
<td align=left valign="top" bgcolor="#ccffcc">
-J extsub=0:0:0:1
</tr>
</table>
same as above with-out ant-aliasing.
<p>
<img align="top" src="sub1-00000.png"> <p>
<li>
<table>
<tr>
<td align=left valign="top" bgcolor="#ccffcc">
-J extsub=0:0:0:0:0:0:255
</tr>
</table>
We make switch another color to full intensity (white) to
make the subtitle appear fatter, maybe too much.
<p>
<img align="top" src="sub2-00000.png"> <p>
<li>
<table>
<tr>
<td align=left valign="top" bgcolor="#ccffcc">
-J extsub=0:0:0:1:0:0:255
</tr>
</table>
The above fat one without anti-aliasing.
<p>
<img align="top" src="sub3-00000.png"> <p>
</ul>
</table>
</table>
<a name=subrip></a>
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<td align=left valign="top" width=30% bgcolor="#a0a0a0">
<table border="0" cellpadding="10" cellspacing="3" font size=+2 bgcolor="#ffffff" width=100%>
<td align="left" bgcolor="#e9e9e9">
<font>generating subtitle files</font>
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<td>
Please find some documentation on Arne Driescher's
<i>subrip</i> program in the <code>contrib/subrip/</code> directory
or visit the <a
href=http://subtitleripper.sourceforge.net/>project page</a>
for more information.
</table>
</table>
<a name=subtitler></a>
<table cellspacing="10" cellpadding="0" border="0" width="100%">
<tr>
<td align=left valign="top" width=30% bgcolor="#a0a0a0">
<table border="0" cellpadding="10" cellspacing="3" font size=+2 bgcolor="#ffffff" width=100%>
<td align="left" bgcolor="#e9e9e9">
<font> generating custom subtitles</font>
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<td>
Please find some documentation on Jan Panteltje's
<i>subtitler</i> plugin in the <code>filter/subtitler/</code> directory
or visit the <a
href=http://www.home.zonnet.nl/panteltje/subtitles/>
project page</a>
for more information.
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Last modified: Thu May 16 12:52:34 CEST 2002
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