Detect changes in resolution in a mjpeg stream

[Guillermo Rodriguez Garcia]

Hello,

Thank you for the suggestion.

I just tried this -- installed an event pad probe at the srcpad of
jpegdec (had to adjust a bit since for this one I am stuck with
gstreamer-0.10, which has gst_pad_add_event_probe instead of
gst_pad_add_probe). However when the source stream changes resolution,
I see that all the downstream elements notice the change, then my
callback function is called. My problem is that I need to intercept
the change before it reaches downstream elements. Is this possible ?

Thank you,

Guillermo

2015-08-13 21:03 GMT+02:00 Carlos Rafael Giani <dv at pseudoterminal.org>:
> You can install a pad probe at the srcpad of jpegdec, and set the probe to
> watch for downstream events. If the probe then sees a CAPS event, you can
> check the caps in that event for changes in width, height, etc.
>
>
> Am 2015-08-13 um 20:36 schrieb Guillermo Rodriguez Garcia:
>>
>> Hello all,
>>
>> I have a mjpeg stream that can sometimes switch to a different image
>> resolution on the fly. This depends on external events over which I
>> have no control. When this happens, I need to do some extra processing
>> in my application.
>>
>> The pipeline is souphttpsrc ! multipartdemux ! jpegdec ! <custom sink
>> element>
>>
>> Are there any events related to multipartdemux or jpegdec that I could
>> use to detect these changes in resolution ?
>>
>> Thank you,
>>
>> Guillermo Rodriguez Garcia
>> guille.rodriguez at gmail.com
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel



-- 
Guillermo Rodriguez Garcia
guille.rodriguez at gmail.com