[gstreamer-bugs] [Bug 481075] Full support for ASS/SSA subtitles

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins | Ver: 0.10.x




------- Comment #21 from Benjamin Schmitz  2008-12-09 17:50 UTC -------
Hi.

The additional CPU load when using assrender is because of the necessary two
additional colorspace conversions (YUV to RGB, then RGB back to YUV).

This is rather suboptimal, so I'm thinking about rewriting assrender so that it
generates ARGB frames instead. These could then be converted to AYUV and put on
top of the video with videomixer. 
That would reduce the amount of necessary colorspace conversions to 1 and
additionally lower the amount of data that has to be processed.

However, assrender somehow needs to know the geometry and FPS of the video
stream - otherwise it cannot render anything.


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