[gst-devel] channel changing dvbsrc plugin

[Sumanth V]

hi all,

         Thanks halley, I tried blocking the source pad of the mpegtsdemux
but it dint work. What ia happening is , when i set the state of
the pipeline to READY , the mpegtsdemux removes its source pad which was
linked to the sink of queue. So when i check for GST_PAD_IS_LINKED on the
sink pad of the queue it return FALSE. So i directly link the sink of queue
to the newly emitted source pad of the mpegtsdemux. I checked for the result
of the gst_pad_link(srcpad, sinkpad); It is returning GST_PAD_LINK_OK.
Why is the video getting freezed?

regards,

2009/3/6 Zhao, Halley <halley.zhao at intel.com>

>  Try to block the upstream src pad before you link/unlink.
>
>
>
>
> http://www.sfr-fresh.com/unix/privat/gstreamer-0.10.22.tar.gz:a/gstreamer-0.10.22/docs/design/part-block.txt
>
>
>
>
>   ------------------------------
>
> *From:* Sumanth V [mailto:sumanth.v at allaboutif.com]
> *Sent:* 2009年3月6日 3:37
> *To:* Discussion of the development of GStreamer
> *Subject:* [gst-devel] channel changing dvbsrc plugin
>
>
>
> Hi All,
>
>              I am writing a application using a dvbsrc plugin to play the
> incoming TV channels. How do i change the channels with out stopping the
> application? Right now i am doing it by changing the es-pid property of the
> mpegtsdemux plugin, i am able to to change the channels, but as soon as i
> change the channel , the video is getting freezed, its not playing. but i
> can change the channles. As soon as i shift to next channel, the video is
> getting freezed.
>          For the first time when i start the application it plays which
> ever channel i have selected, but later when i try to change the channels ,
> the video is getting freezed.
>
> The method i am using to change the channel is :-
>  * when i want to change a channel, i set the pipeline to READY state and
> tune to a channel which i want to play and the set the "es-pid" property of
> the
>     mpegtsdemux plugin to the pid of the channel which i want to play.
>  * Set the pipeline back to PLAYING state.
>  * When the mpegtsdemux plugin generates a new pad for the new channel , i
> unlink the previous linked queue pad to the mpegtsdemux and then link to the
> new pad.
>
>  the pipeline is
>  gst-launch dvbsrc diseqc-source=0 frequency=10990000 symbol-rate=27500
> polarity="v" code-rate-hp=3/4 ! mpegtsdemux ! queue ! mpeg2dec !
> ffmpegcolorspace ! xvimagesink
>
>  Where am i going wrong here? Why is the video of the new channel  getting
> freezed??
>
> regards,
> Sumanth
>
>
>
>
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