[gstreamer-bugs] [Bug 356369] New: Problems with gst_element_seek

[GStreamer (bugzilla.gnome.org)]

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http://bugzilla.gnome.org/show_bug.cgi?id=356369
 GStreamer | gstreamer (core) | Ver: 0.10.9

           Summary: Problems with gst_element_seek
           Product: GStreamer
           Version: 0.10.9
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: andreas.tunek at gmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: 2.13/2.14
   GNOME milestone: Unspecified


Please describe the problem:
The following code is used for seeking:

bool GstPlayer::seek_relative(gint64 time){
  gst_element_set_state (GST_ELEMENT (player), GST_STATE_PAUSED);
  if (!gst_element_seek (player, //the element
                         1.0, //new playback rate, same as before
                         GST_FORMAT_TIME, //the format of the time is in
microseconds
                         GST_SEEK_FLAG_FLUSH, //don't know really what this
means
                         GST_SEEK_TYPE_CUR, // change from the current position
                         time * GST_SECOND,//how much should you change
                         GST_SEEK_TYPE_NONE,
                         GST_CLOCK_TIME_NONE)) {
    g_print ("Seek failed!\n");
  }
  gst_element_set_state (GST_ELEMENT (player), GST_STATE_PLAYING);
}

the "player" element was constructed with
player = gst_element_factory_make("playbin", "player"); and 

The plan is that the argument ("time") decides how much you should seek,
forwards or backward. If you give "1" as an argument it should seek 1 second
forward, if you give "-1" as the argument it should seek 1 second backwards.

For a .ogg file this works perfectly. For an .flac file the following error is
reported: GStreamer-CRITICAL **: gst_pad_query_convert: assertion `src_val >=
0' failed

This happens when the "time" argument is negative.

For a .mp3 file forward seeking works, but backwards seeking stop the player.

I do not know if this is a but or intended behavior, but I find it strange that
different elements give different result.



Steps to reproduce:
1. Try my program with different files.
2. Try to seek backwards and forward.
3. Watch and hear the output.


Actual results:
Seek backwards only work for .ogg files.

Expected results:
It should work for all files supported by gstreamer.

Does this happen every time?
Yes

Other information:
I will try to add the program I hacked up.


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