qt5.2 gstreamer subtitle display

[sky2]

Hi Everybody,

  I developed a large application in Qt 4.8.4 on linux mint 14 which simply
put displays a playlist of videos. Now I am trying to port it to Qt 5.2. All
works well except for the subtitle (closed captioning) display.

In Qt 4.8.4 I used the phonon player with phonon backend
phonon_gstreamer.so. The subtitles used to be placed in a file video.srt
(for video.mp4) in the same directory.

In qt5.2 built with GStreamer-0.10, the subitles (closed captions) are just
not displayed when the video is played.

I went over the code of both Qt5.3 gstreamer plugin and qt 4.8.4 gstreamer
plugin and found very little difference.

Both of them seem to set the flag GST_PLAY_TEXT (0x00000004).

Both of them seem to set the flag GST_PLAY_FLAG_NATIVE_VIDEO (0x00000040)

Both of them seem to use playbin2

Neither of them seem to set the property "suburi" on playbin2

In Qt5.2, I changed the plugin code to, 1. set the "suburi" on playbin2 to
point to the subtitles file video.srt and 2. Made it to ignore (unset) the
flag GST_PLAY_FLAG_NATIVE_VIDEO (both in the file
qgstreamerplayersession.cpp )

Then the subtitle started being shown correctly.

I want to know what is causing this change in behavior of the plugin? Is it
a bug in Qt5.2? How should I work around it? Should I set the "suburi"
property on playbin2 in the plugin?

If that is so then it is very difficult. As it is a plugin, I need to build
a whole mechanism to pass the subtitle(closed caption) filename to the
plugin so that I can set the suburi property on playbin2. Thank you. Any
help is appreciated.

Sky



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