[gst-devel] Seek doesn't work

[Tim Müller]

On Fri, 2007-08-17 at 21:40 +0200, Thomas Holzmann wrote:

> I have a problem with gst_element_seek: It seems that the demux element 
> (I've tried it with qt and avi) in decodebin cannot handle the seek 
> command. In debug mode I get this message for the demuxer:

> gstavidemux.c:3243:gst_avi_demux_handle_seek:<avidemux0> unsupported 
> format given, seek aborted.
> 
> My pipeline is " filesrc ! decodebin ! ffmpegcolorspace ! appsink " and 
> I've tried to seek with these commands:
> 
> gst_element_seek(file_decode_, 1.0, GST_FORMAT_PERCENT,
>                  GST_SEEK_FLAG_NONE, GST_SEEK_TYPE_SET, time,
>                  GST_SEEK_TYPE_NONE, GST_CLOCK_TIME_NONE)
> 
> gst_element_seek_simple(file_decode_, GST_FORMAT_PERCENT,  
> GST_SEEK_FLAG_NONE, time)
> 
> Does someone know what my problem could be?

Hardly any element supports seeks in GST_FORMAT_PERCENT.  You'll
probably have more luck with GST_FORMAT_TIME. Do a duration query before
the seek and scale that accordingly (gst_util_uint64_scale_int might
come in handy for that).  Also, unless you're doing something fancy you
probably want to use GST_SEEK_FLAG_FLUSH, possibly in combination with
GST_SEEK_FLAG_KEY_UNIT if precision isn't particularly important.

 Cheers
  -Tim