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</o:shapelayout></xml><![endif]--></head><body lang=RU link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hi everyone!<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I’m a newbie, and I’m asking for your help with the next problem:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I have a webkit build with GStreamer usage for playing HTML5 video/audio content.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>The problem is in a big delay between calling gst_stream_volume_set_volume() and actually receiving audio stream with volume change.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>The delay is about 5-8 seconds.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Currently, we are using playbin2 GStreamer component to play the audio/video content.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Here is the link to source file we’ve based our solution:<o:p></o:p></span></p><p class=MsoNormal><a href="http://gitorious.org/webkit/qtwebkit-webkit2-dev/blobs/356a65eae11c560e1953c6cba8c455d5be369a95/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp"><span lang=EN-US>http://gitorious.org/webkit/qtwebkit-webkit2-dev/blobs/356a65eae11c560e1953c6cba8c455d5be369a95/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp</span></a><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I have very unclear understanding how the whole GStreamer system works, I’ve tried to add explicitly the volume component by:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>m_vol = gst_element_factory_make("volume", NULL);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>gst_bin_add(GST_BIN(m_playBin), m_vol);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>and modifying code to call setVolume for m_vol:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>void MediaPlayerPrivateGStreamer::setVolume(float volume) {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> m_vol = gst_element_factory_make("volume", NULL);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> gst_bin_add(GST_BIN(m_playBin), m_vol);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>}<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>But I get the same effect.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Is there a way to find out what’s the reason for such a big delay ?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Could it be the reason that volume is not change for already buffered data ?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I’m grateful for any help from you guys.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Thank you,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Andrey Yanov<o:p></o:p></span></p></div></body></html>