[gst-devel] Getting converted frame from playbin2 element

[Marco Ballesio]

Hi,

On Mon, Jan 3, 2011 at 1:12 PM, vaisaari <vaisaari at gmail.com> wrote:
>
> Hi all,
>
> I'm trying to implement a function that returns the current frame of
> playbin2 element as a QImage (Qt data type). When I call the function (for
> the same video), sometimes it works perfectly, sometimes parts of the frame
> (bottom rows) are missing. What am I doing wrong? Should I somehow be able
> to wait for the "convert-frame" operation to finish, or what? You can find
> my example code below. Thank you for your help!

imo this should not happen, as the signal handler (delegated to
playsink) internally calls gst_play_sink_get_last_frame, which locks
playsink. Can you post to pastebin the output you get after setting
GST_DEBUG=playsink:5 ?

Which video decoder are you using?

Besides, if you're trying to render a video clip in Qt, you may
consider using QtGStreamer..

Regards

>
>
> QImage Video::getFrame()
> {
>
> GstBuffer *buffer;
> GstCaps *caps;
>
> caps = gst_caps_new_simple("video/x-raw-rgb","bpp", G_TYPE_INT, 24,"depth",
> G_TYPE_INT, 24,NULL);
>
> g_signal_emit_by_name(player, "convert-frame", caps, &buffer);
>
> unsigned char* data=(unsigned char *) GST_BUFFER_DATA (buffer);
> QImage img(data, width, height, QImage::Format_RGB888);
>
> return img;
> }
>
>
> --
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> Sent from the GStreamer-devel mailing list archive at Nabble.com.
>
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