Getting EOS while doing a reverse playback with seek event with gstreamer-1.2.4

[Amit Pandya]

Hi,

I'm trying reverse video playback using "seek event" with h264 encoded .mp4
stream on gstreamer-1.2.4 on ubuntu 14.04 desktop.
H264 compressed video was encoded with "iframeinterval=1" in mp4 container.

Following is the gst-launch-1.0 reference pipeline.
gst-launch-1.0 -r filesrc location=720x480_ifi_1.mp4 ! qtdemux ! queue !
h264parse ! avdec_h264 ! xvimagesink -e

Pipeline hits EOS just after sending following seek event & execution ends
prematurely (less than one second)
gst_event_new_seek((-1.0), GST_FORMAT_TIME,
   GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE | GST_SEEK_FLAG_SKIP,
   GST_SEEK_TYPE_SET, 0, GST_SEEK_TYPE_SET, G_MAXUINT64);

NOTE: 
1) If use stop position (n*GST_SECOND) instead of G_MAXUINT64 stills
observed the same EOS issue.  
2) Also,tried with .mkv container instead (same h264 stream) &
gst_element_send_event() fails with return FALSE.  

To simplify testing, I modified tools/gst-launch.c from gstreamer1.0-1.2.4,
to provide the necessary seek event for reverse playback: 
 
878a879,903 
> static void 
> send_reverse_event (void) 
> { 
>  GstEvent *seek_event; 
>  GstStateChangeReturn state; 
> 
>  /* Create event to reverse from max possible position to start */ 
>  seek_event = gst_event_new_seek((-1.0), GST_FORMAT_TIME,
>  GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE | GST_SEEK_FLAG_SKIP,
>  GST_SEEK_TYPE_SET, 0, GST_SEEK_TYPE_SET, G_MAXUINT64); 
> 
>  if (!gst_element_send_event(pipeline, seek_event)) 
>  { 
>         g_printerr (_("WARNING: Cannot set reverse.\n")); 
>         return; 
>  } 
> 
>     /* Wait for pipeline state change */ 
>  state = gst_element_get_state(pipeline, NULL, NULL, GST_SECOND); 
>  if ((state != GST_STATE_CHANGE_SUCCESS) && (state !=
> GST_STATE_CHANGE_ASYNC)) 
>  { 
>  g_printerr(_("WARNING: Unsuccessful state change for reverse\n")); 
>  } 
> } 
> 
885a911 
>   gboolean reverse = FALSE; 
908a935,936 
>     {"reverse", 'r', 0, G_OPTION_ARG_NONE, &reverse,
>         N_("Play source in reverse, if supported"), NULL},
1064a1093,1098 
> 
>       if (reverse) 
>       { 
>      PRINT (_("Reverse selected.\n")); 
>      send_reverse_event(); 
>       } 

Also, tried with the attached sample test app & observed the same issue.

Let me know in case it's already known issue or already have a fix
available.


seek_testapp.c
<http://gstreamer-devel.966125.n4.nabble.com/file/n4671929/seek_testapp.c>  
  
 



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