[gst-devel] RTSP stream and seeking operations

[Wim Taymans]

On Tue, 2009-02-24 at 01:08 -0800, Aleksey Yulin wrote:
> I'm implementing a video player application that should be able to play
> mpeg2ts from RTSP server. Everything seems to be working fine. The only
> problem I've faced is that SEEK operation doesn't work when rendering RTSP
> streams (in the same time it works just fine with local mpeg4 files).
> gst_element_seek call just fails and rendering is stopped.
> 
> My pipeline looks like follows:
> 
> source -> decodebin -> videobin (queue -> ffmpegcolorspace -> autovideosink)
>                                -> audiobin (queue -> audioconvert ->
> audioresample -> volume -> autoaudiosink)
> 
> source is created using ::gst_element_make_from_uri() function. I beleive
> it's rtspsrc in my case.
> 
> I've checked what RTSP requests are being sent to the server and as I could
> see there's a valid seek request (i'm seeking to the 5th second from the
> beginning of the stream):
> 
> PLAY
> Range: npt=5.0000-
> 
> Then the server responds with 200 OK:
> 
> status line: 200 OK
> Range: npt=4-579
> 
> The communication seems to look OK, but gst_element_seek fails then and
> stream is stopped (I don't see any state change notifications though).
> 
> I tried to play the same rtsp stream using Totem player, but the seek
> operation seems to be unavailabe there too. This looks really strange as
> RTSP server supports seeking and the rtspsrc seems to send seek command
> correctly.
> 
> Where I might be wrong here? May be seeking RTSP streams require some
> additional actions to do?

It's probably because seeking in rtspsrc is not fully working and needs
some more code here and there.

Wim

> 
> Thanks in advance!
>