support reverse playback by negative rates such as -1,-2,-4??

[zwresh]

it seems that the gstreamer can't support to reverse playback by negative playback rates such as  -1,-2,-4.

The arguments I set in gst_element_seek are as below.
        gst_element_seek (pipeline,
                                        -2.0 ,
                                       GST_FORMAT_TIME,
                                       GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT,
                                        GST_SEEK_TYPE_SET,
                                       0,
                                       GST_SEEK_TYPE_SET,
                                       cur_pos);
-- cur_pos is the position from where i want to seek.

Can anybody help me ???




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[Tim-Philipp Müller-2]

On Wed, 2011-06-01 at 16:23 +0800, zwresh wrote:

> it seems that the gstreamer can't support to reverse playback by
> negative playback rates such as  -1,-2,-4.

"GStreamer" (the framework) supports this just fine.


> The arguments I set in gst_element_seek are as below.

>         gst_element_seek (pipeline,
>             -2.0 ,
>             GST_FORMAT_TIME,
>             GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT,
>             GST_SEEK_TYPE_SET,
>             0,
>             GST_SEEK_TYPE_SET,
>             cur_pos);
>
> -- cur_pos is the position from where i want to seek.
>
> Can anybody help me ???

Whether this will work or not depends a lot on the exact elements
involved (demuxer, parsers, decoders). So it might work for some
formats/files, but not for others, depending on the elements used.

 Cheers
  -Tim


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