[gstreamer-bugs] [Bug 525743] support for subtitles as kate streams

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-bad | Ver: 0.10.x




------- Comment #39 from Tim-Philipp Müller  2009-07-10 18:40 UTC -------
> It would be possible to do this, if code was added to convert images from
> a Kate stream to the DVD subpicture format (the SPUs are not just dumped
> as in in the stream, though the encoding used for SPU type images is also
> RLE based). Since the renderer in this element handles all types of images
> that may be found in a stream, I thought it unnecessary to have a decoder
> convert back paletted images to SPUs. Would it gain much to also do it
> this way ? (compatibility, speed ?)

Well, it seems a bit asymetrical as it is now. And I feel that one should be
able to get to the subpicture data in some way (either as a fake kate bitmap
format, for which one could have yet another decoder/transcoder that changes it
into dvd format, or included in katedec) without overlaying it, e.g. for
transcoding purposes.

Also, for playbin integration it would be much much easier if katedec outputted
dvd-subpicture format for bitmaps. I think we want to avoid plugging all kinds
of overlay elements, or rows of overlay elements, in playbin. Besides, it seems
your overlay element only handles RGB at the moment, which isn't really ideal
for the still most common case where the decoder outputs YUV which gets piped
to xvimagesink, as far as I can tell.

(In the long run / for 0.11/1.0 we would probably want some sort of generic
overlay format in gstreamer with one overlay element to rule them all; I think
Jan might have started looking into that.)


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