[vlc-devel] Libvlc, OpenGL and Qt
remy.sanchez at hyperthese.net
Thu Sep 22 23:46:41 CEST 2011
Well, I'm not sure it's the best place to ask my question, but I would feel
strange asking that on vlc-users...
Anyways : I'm doing a Qt application that show pictures, videos and stuff
inside of a QGLWidget (actualy, Qt is merely used to create the OpenGL context
and for the signal/slot facility).
By inspiring myself of the SDL example from the wiki, I was able to display
some video, however there is still a lot of bugs. See the code :
In short, update() is called every 1/60 second to draw on the screen if the
slide is in a visible state. Everything is in the Qt thread, excepted the
callbacks given to VLC. With this code, I get a video, but from what I see :
- libvlc_media_get_tracks_info() returns 0 tracks, even with
libvlc_media_parse(m) being called just before.
- I'm forced to create the texture with the GL_BGRA format, and to draw
it upside down, I'm not sure how normal this is
- Calling libvlc_video_set_format() from resize() while the video is
playing does nothing
- video_end_callback() is not called when the video reaches the end
By the way, I'm voluntarily trying to do soft video scaling, because my GPU is
quite crappy (Intel GMA...) and having it to resize things is killing the FPS,
which I need to be perfect. I'm however not sure how sustainable this will be,
being given the 1920x1080 screen...
Any suggestion on those issues, or anything else I did wrong, is much
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