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[MPlayer-dev-eng] [PATCH] fix segfault when pressing Q without teletext

Hi,

currently MPlayer crashes when one presses the Q key during mp3 playback.
The reason is that Q tries to change some teletext property even if the TV 
demuxer is not active.

Attached patch fixes the crash.

Ok to apply?

Regards

Sascha

Index: command.c
===================================================================
--- command.c	(revision 27769)
+++ command.c	(working copy)
@@ -1949,6 +1949,8 @@
     tvi_handle_t *tvh = mpctx->demuxer->priv;
     int result;
     int val;
+    if (mpctx->demuxer->type != DEMUXER_TYPE_TV || !tvh)
+        return M_PROPERTY_UNAVAILABLE;
     switch(action){
     case M_PROPERTY_STEP_UP:
     case M_PROPERTY_STEP_DOWN:

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