Trick mode: backward play is not happening

[amit.debnath at wipro.com]

Hi,

I am trying to implement trick mode backward play with gstreamer.

OS: Ubuntu 10.04.

File type : .wmv file.


I am trying to use the following method:

1. Getting position by calling gst_element_query_position().

2. Then passing different play rate to the API gst_event_new_seek() for playing in different speed..

if (play_rate > 0)
{
seek_event = gst_event_new_seek ((gdouble)play_rate, GST_FORMAT_TIME, (GstSeekFlags)(GST_SEEK_FLAG_ACCURATE|GST_SEEK_FLAG_FLUSH),
GST_SEEK_TYPE_SET, position, GST_SEEK_TYPE_NONE, 0);
}
else
{
seek_event = gst_event_new_seek (play_rate, GST_FORMAT_TIME, (GstSeekFlags)(GST_SEEK_FLAG_ACCURATE|GST_SEEK_FLAG_FLUSH),
GST_SEEK_TYPE_SET, 0, GST_SEEK_TYPE_SET, position);
}

In my case when the play_rate is >1, fast forward is happening nicely.

But every time I am trying with any negative value, the backward play is not happening.

The event is not returning any error as well. The play is happening with the previous speed set.


Please help me out to play the media backward.

Regards,
Amit




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