[gst-devel] About videotest and rtsp-server : is-live true and false

[yangsb]

Hi, Luca
Thanks for your reply.
I need to post my environment .
gstreamer-0.10.21
gst-plugin-base-0.10.21
gst-plugin-good-0.10.10
gst-plugin-ugly-0.10.9
gst-plugin-bad-0.10.10
gst-rtsp-server-0.10.1 (
http://cgit.freedesktop.org/gstreamer/gst-rtsp-server/commit/?id=e789a8fdf31aeae4234a2fb7a7e4b251b47edfa5
)

I think the bug may be lies in the rtsp-server.
Plesae check this version of rtsp-server:
http://cgit.freedesktop.org/gstreamer/gst-rtsp-server/commit/?id=de1ebbc21be20ab1ac6a6888e9830e084264e4d5


Thanks 
Best regards.


Luca Ognibene-3 wrote:
> 
> On Wed, Apr 1, 2009 at 12:37 PM, yangsb <yangsb05 at gmail.com> wrote:
>>
>> I am trying my rtsp-server using videotestsrc as the video input.
>> I found that if the property is-live of videotestsrc is false , my server
>> works fine.
>> Buf if is-live of videotestsrc is true , my server still works , but the
>> client ( vlc media player  )
>> can only receiving  packets , not able to decode and display images.
>>
>> I wish to know what happens to videotestsrc when is-live becomes true ?
>>
> 
> Hi, i had the same problem yesterday so i know what's going on! At
> least i think..
> If you set is-live to false:
>  * client(vlc) send DESCRIBE request
>  * rtsp-server creates your pipeline
>  * rtsp-server set_state(gst.STATE_PAUSED) and wait for preroll
>  * rtsp-server reply to client
>  * client send SETUP and PLAY request
>  * rtsp-server set_state(gst.STATE_PLAYING) your pipeline
> 
> If you set is-live to true:
>  * client(vlc) send DESCRIBE request
>  * rtsp-server creates your pipeline
>  * rtsp-server set_state(gst.STATE_PLAYING)  (there's no preroll in a
> live pipeline)
>  * rtsp-server set_state(gst.STATE_PAUSED)
>  * rtsp-server reply to client
>  * client send SETUP and PLAY request
>  * rtsp-server set_state(gst.STATE_PLAYING) your pipeline
> 
> This way your client loses buffers created from the first to the
> second set_state and if you're encoding in mpeg4/h264 or so your
> client will need to wait for the next keyframe to display something.
> This is whay i've understood yesterday looking at rtsp-server code
> (mainly rtsp-media.c).. please correct me if i'm wrong :)
> 
> ciao
> Luca
> 
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