[gstreamer-bugs] [Bug 341681] New: blinked textoverlay

[GStreamer (bugzilla.gnome.org)]

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

           Summary: blinked textoverlay
           Product: GStreamer
           Version: 0.10.x
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: minor
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: ganadist at chollian.net
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: 2.13/2.14
   GNOME milestone: Unspecified


Please describe the problem:
I'm working sami parser and pangocairo textoverlay plugin.

You can see them bug 169936 and bug 340887

And some sami subtitles are often used for karaoke like below.

ex)
<SYNC START=32538><P CLASS=KRCC>
I believe<BR>
I believe
<SYNC START=32571><P CLASS=KRCC>
<font color=#33BEF1>I</FONT> believe<BR>
I believe
<SYNC START=33247><P CLASS=KRCC>
<font color=#33BEF1>I be</FONT>lieve<BR>
I believe
<SYNC START=33984><P CLASS=KRCC>
<font color=#33BEF1>I believe</FONT><BR>
I believe

I'll attach sample smi file.

When play above smi file, each frames are render with some delay. (it shows
like
didn't use double buffer)





Steps to reproduce:
1. apply  bug 169936 and bug 340887 patch at gst-plugins-base
2. run this command
$ gst-launch -v filesrc location=./test.smi ! subparse ! txt. videotestsrc !
textoverlay name=txt font-desc=Sans\ 30 ! ffmpegcolorspace ! ximagesinkk


Actual results:
render smoothly.

Expected results:
render with some delay.

Does this happen every time?
yes.

Other information:
When render with textrender plugin, It renders smoothly.

You can use this command.

$ gst-launch -v filesrc location=./test.smi ! subparse ! textrender
font-desc=Sans\ 30 ! ffmpegcolorspace ! ximagesink

You must resize window after above command.

textoverlay and textrender plugins are same render algorithm. I think this bug
is not relate with textoverlay plugin,

this bug appear pango textoverlay plugin (based pango freetype backend), too.

I think this bug will be related with video image mixing layer or something
equality[


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