[gst-devel] Remove unlinked elements from pipeline

[sudarshan bisht]

Hi ,

first add all the elements in your bins or pipeline , but you need to link
them according to certain situations  .

So first you need to check in the bus call back that your file has audio
data of not , that means whether your demuxer or uridecodebin has created an
audio src pad or not . If audio src pad is created then only link this pad
with the sink pad of tee ( or proxy pad of the respective bin ) . Else just
skip it.

By doing this you can play a container file which does not have audio
elementary stream.




On Mon, Jul 12, 2010 at 3:43 PM, Hecate_Eos <xflxmin17 at 163.com> wrote:

>
> Hi All
> I use uridecodebin to decode my file. I can play the file with both video
> and audio, but I have the problem when the file just has video. For
> example,
> I play the webcamera.
>                               ----------
> ---------------------------------------
>                        /  -> | tee0 |   ->   |   Video Output to Screen  |
> ----------------------/        ----------
> ---------------------------------------
> | uridecodebin |
> ----------------------
>                      \                ---------
> ------------------------------------------------
>                         \ ---X---> | tee1 |   ->  |     Audio Output to
> sound device |
>                                      ----------
> ------------------------------------------------
> First, I have added all the elements to the pipeline.
> I link uridecodebin with tee0 and tee1 in it's "pad-added" event. When I
> play a file with both audio & video , it can work well.
> But, I want also playback the file without audio and the webcamera using
> the
> same pipeline. You know, the webcamera don't have the audio, so in the
> "pad-added" event , I don't link uridecodebin to tee1.
> So, I want to remove tee1 & audio output elements. I do the remove
> operation
> in the uridecodebin's "no-more-pads" event.
> I have searched on the Internet that I can't really remove elements in the
> "no-more-pads". So, I just in it post a custom message. I in the bus
> message
> process callback to remove the elements. But, I can't get it work.
> Please, tell me how to remove the unlinked elements and make the pipeline
> run.
> Or, tell me how I can dynamicly add the tee0, video output, tee1, audio
> output to the pipeline which just has single element - uridecodebin.
>
> Thanks in advance . Sincerely.
>
> --
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> Sent from the GStreamer-devel mailing list archive at Nabble.com.
>
>
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-- 
Regards,

Sudarshan Bisht
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