How do I clean a pipeline to start/stop it several times?

[ldac]

    Hi all,

I have programmed a C application where I capture video, then I encode
it, and finally I stream it using an udpsink element. It works, but if I
stop the pipeline (sending it EOS) and then start it again, I get old
video, when it should be alive. How can I clean absolutely the pipeline
to avoid this?

    My code is something like this:
   
        ...
        // Create the elements
        pipeline = gst_pipeline_new( "pipe" );
        video_src = gst_element_factory_make( "mfw_v4lsrc",
"video-source" );
        video_enc = gst_element_factory_make( "mfw_vpuencoder",
"video-encoder" );
        sink = gst_element_factory_make( "udpsink", "sink" );
        // Add the elements to the pipeline
        gst_bin_add_many( GST_BIN( pipeline ), video_src, video_enc,
sink, NULL );
        gst_element_link_with_filter( video_src, video_enc, &settings );
        gst_element_link( video_enc, sink );
        ...
        // Start/Stop the video stream
        while ( 1 )
        {
             if ( do_stream )  
             {
                 gst_element_set_state( pipeline, GST_STATE_PLAYING );
                 g_main_loop_run( loop );
                 gst_element_set_state( pipeline, GST_STATE_NULL );
             }
             else
                sleep( 1 );
        }
        ...

    Another function changes the variable 'do_stream' to true/false, and
send also the EOS signal to the pipeline when required.

    So, specifically, my question is: What do I clean my pipeline when
stopped to start again with the buffers and everything clean? Do I have
to delete the pipeline object and do I have to create and link all the
pipeline again?

    Thank you very much.
    All the best.
    LD.



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[Philip Jägenstedt]

Why not just have separate pipelines for the two tasks?

On Wed, Jul 15, 2009 at 13:43, ldac<[hidden email]> wrote:

>
>    Hi all,
>
> I have programmed a C application where I capture video, then I encode
> it, and finally I stream it using an udpsink element. It works, but if I
> stop the pipeline (sending it EOS) and then start it again, I get old
> video, when it should be alive. How can I clean absolutely the pipeline
> to avoid this?
>
>    My code is something like this:
>
>        ...
>        // Create the elements
>        pipeline = gst_pipeline_new( "pipe" );
>        video_src = gst_element_factory_make( "mfw_v4lsrc",
> "video-source" );
>        video_enc = gst_element_factory_make( "mfw_vpuencoder",
> "video-encoder" );
>        sink = gst_element_factory_make( "udpsink", "sink" );
>        // Add the elements to the pipeline
>        gst_bin_add_many( GST_BIN( pipeline ), video_src, video_enc,
> sink, NULL );
>        gst_element_link_with_filter( video_src, video_enc, &settings );
>        gst_element_link( video_enc, sink );
>        ...
>        // Start/Stop the video stream
>        while ( 1 )
>        {
>             if ( do_stream )
>             {
>                 gst_element_set_state( pipeline, GST_STATE_PLAYING );
>                 g_main_loop_run( loop );
>                 gst_element_set_state( pipeline, GST_STATE_NULL );
>             }
>             else
>                sleep( 1 );
>        }
>        ...
>
>    Another function changes the variable 'do_stream' to true/false, and
> send also the EOS signal to the pipeline when required.
>
>    So, specifically, my question is: What do I clean my pipeline when
> stopped to start again with the buffers and everything clean? Do I have
> to delete the pipeline object and do I have to create and link all the
> pipeline again?
>
>    Thank you very much.
>    All the best.
>    LD.
>
>
>
> ------------------------------------------------------------------------------
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> This is your chance to win up to $100,000 in prizes! For a limited time,
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> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>

--
Philip Jägenstedt

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[AJAY GAUTAM]

There is two way :
1. you can delete old pipeline ,delete the pipeline object and set new video path and with creating new pipeline after getting EOS.
2. you can do like this after getting EOS:
gst_element_set_state( pipeline, GST_STATE_NULL );
gst_element_set_state( pipeline, GST_STATE_READY);
then set new video path
gst_element_set_state( pipeline, GST_STATE_PLAY);

Definitly it will work.

On Wed, Jul 15, 2009 at 5:13 PM, ldac <[hidden email]> wrote:

   Hi all,

I have programmed a C application where I capture video, then I encode
it, and finally I stream it using an udpsink element. It works, but if I
stop the pipeline (sending it EOS) and then start it again, I get old
video, when it should be alive. How can I clean absolutely the pipeline
to avoid this?

   My code is something like this:

       ...
       // Create the elements
       pipeline = gst_pipeline_new( "pipe" );
       video_src = gst_element_factory_make( "mfw_v4lsrc",
"video-source" );
       video_enc = gst_element_factory_make( "mfw_vpuencoder",
"video-encoder" );
       sink = gst_element_factory_make( "udpsink", "sink" );
       // Add the elements to the pipeline
       gst_bin_add_many( GST_BIN( pipeline ), video_src, video_enc,
sink, NULL );
       gst_element_link_with_filter( video_src, video_enc, &settings );
       gst_element_link( video_enc, sink );
       ...
       // Start/Stop the video stream
       while ( 1 )
       {
            if ( do_stream )
            {
                gst_element_set_state( pipeline, GST_STATE_PLAYING );
                g_main_loop_run( loop );
                gst_element_set_state( pipeline, GST_STATE_NULL );
            }
            else
               sleep( 1 );
       }
       ...

   Another function changes the variable 'do_stream' to true/false, and
send also the EOS signal to the pipeline when required.

   So, specifically, my question is: What do I clean my pipeline when
stopped to start again with the buffers and everything clean? Do I have
to delete the pipeline object and do I have to create and link all the
pipeline again?

   Thank you very much.
   All the best.
   LD.



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--
Thanx & Regards
Ajay Gautam
[phone]

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[Stefan Sauer]

ldac schrieb:

>     Hi all,
>
> I have programmed a C application where I capture video, then I encode
> it, and finally I stream it using an udpsink element. It works, but if I
> stop the pipeline (sending it EOS) and then start it again, I get old
> video, when it should be alive. How can I clean absolutely the pipeline
> to avoid this?
>
>     My code is something like this:
>    
>         ...
>         // Create the elements
>         pipeline = gst_pipeline_new( "pipe" );
>         video_src = gst_element_factory_make( "mfw_v4lsrc",
> "video-source" );
>         video_enc = gst_element_factory_make( "mfw_vpuencoder",
> "video-encoder" );
>         sink = gst_element_factory_make( "udpsink", "sink" );
>         // Add the elements to the pipeline
>         gst_bin_add_many( GST_BIN( pipeline ), video_src, video_enc,
> sink, NULL );
>         gst_element_link_with_filter( video_src, video_enc, &settings );
>         gst_element_link( video_enc, sink );
>         ...
>         // Start/Stop the video stream
>         while ( 1 )
>         {
>              if ( do_stream )  
>              {
>                  gst_element_set_state( pipeline, GST_STATE_PLAYING );
>                  g_main_loop_run( loop );
>                  gst_element_set_state( pipeline, GST_STATE_NULL );
>              }
>              else
>                 sleep( 1 );
>         }
>         ...
>
>     Another function changes the variable 'do_stream' to true/false, and
> send also the EOS signal to the pipeline when required.
>
>     So, specifically, my question is: What do I clean my pipeline when
> stopped to start again with the buffers and everything clean? Do I have
> to delete the pipeline object and do I have to create and link all the
> pipeline again?

You need to talk to the vendor of mfw_v4lsrc, mfw_vpuencoder to get confirmation
from them that their elements are reusable (that is they correcly cleanup their
state in state_changed()).

Stefan

>
>     Thank you very much.
>     All the best.
>     LD.
>
>
>
> ------------------------------------------------------------------------------
> Enter the BlackBerry Developer Challenge  
> This is your chance to win up to $100,000 in prizes! For a limited time,
> vendors submitting new applications to BlackBerry App World(TM) will have
> the opportunity to enter the BlackBerry Developer Challenge. See full prize  
> details at: http://p.sf.net/sfu/Challenge
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel

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