dynamically change video resolution

[mingqian Han]

Hi all,
    Currently I am working with TI Davinci processor, and I build a gstreamer pipeline for video streaming as follows:
    v4l2src->capsfilter->tee->queue->resizer->h264encoder->rtph264pay->udpsink
                                               ->queue->resizer->mjpegencoder->filesink
    It is just a brief outline, and it works ok.

    Now I want to change the resolution from D1->CIF on the fly, currently, I do the following:
    1. get the src pad of queue
    2. block the pad
    3. change the properties of resizer and the encoder.
    4. unblock the pad
 
    but after that, the pipeline stops working. I am new to gstreamer, and wonder if anyone could give me some suggestion.

regards,

Rafael


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[HaroldJRoth]

When you say 'pipeline stops working', have you tried querying the pipeline state?  

Just a guess, but you may need to put it back into the PLAYING state.

[Marco Ballesio]

Hi,

2010/12/1 mingqian Han <[hidden email]>:

> Hi all,
>     Currently I am working with TI Davinci processor, and I build a
> gstreamer pipeline for video streaming as follows:
>
> v4l2src->capsfilter->tee->queue->resizer->h264encoder->rtph264pay->udpsink
>
> ->queue->resizer->mjpegencoder->filesink
>     It is just a brief outline, and it works ok.
>
>     Now I want to change the resolution from D1->CIF on the fly, currently,
> I do the following:
>     1. get the src pad of queue
>     2. block the pad
>     3. change the properties of resizer and the encoder.
>     4. unblock the pad
>
>     but after that, the pipeline stops working. I am new to gstreamer, and
> wonder if anyone could give me some suggestion.

running the pipeline under GDB and getting a stack trace after the
deadlock occurs will give us some more hints.

Alternatively (in case you don't have gdb running on the device) you can:

1) execute "ulimit -c unlimited" on your device.
2) send a SIGABRT after the deadlock occurs and
3) get the backtrace from the core with the GDB provided in the BSP
(e.g. "gdb /path/to/executable core").

Hope this helps.

Regards

>
> regards,
>
> Rafael
>
>
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> Tap into the largest installed PC base & get more eyes on your game by
> optimizing for Intel(R) Graphics Technology. Get started today with the
> Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs.
> http://p.sf.net/sfu/intelisp-dev2dev
> _______________________________________________
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> [hidden email]
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>
>

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[Andrey Nechypurenko-2]

Hi,

>     Now I want to change the resolution from D1->CIF on the fly, currently,
> I do the following:
>     1. get the src pad of queue
>     2. block the pad
>     3. change the properties of resizer and the encoder.
>     4. unblock the pad

In my project I was doing something similar. You can take a look at
the function which adjust caps for the scaler element here:
http://www.gitorious.org/veter/veter/blobs/master/src/vehicle/VideoSenderThread.cpp#line264
It assumes that there are scaler element named "qos-scaler" followed
by caps filter named "qos-caps" .

HTH,
Andrey.

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