[gst-devel] Changing video size at runtime using videoscale
romit.chatterjee at gmail.com
Thu Nov 9 05:43:41 CET 2006
I've written an test application to play .mp4 video files. The pipeline is :
filesrc -> qtdemux -> ffdec_mpeg4 -> sdlvideosink. The pipeline is working
fine. Now I want to have runtime video scaling. So I included videoscale in
between ffdec_mpeg4 and sdlvideoscale. When I set the caps of videoscale src
pad while creating the pipeline, I can set different video sizes. However I
want to know how I can reset the video size to a different heightXwidth when
the pipeline in already playing (say, after 3 seconds of playback, the video
size should become half of original size). I have a callback registered,
which gets called after 3 seconds. Inside the callback, I'm trying to set
the caps of the videoscale src pad, but its not working. The video is
playing for first 3 seconds and then getting EOS. Can someone please let me
know the correct method to achive my goal?
Given below is my callback code...
Callback function (input : height, width of the original video)
pad = gst_element_get_pad(videoscale, "src");
newpadcaps = gst_caps_new_simple("video/x-raw-yuv",
GST_MAKE_FOURCC('I', '4', '2', '0'),
"width", G_TYPE_INT, (width/2),
"height", G_TYPE_INT, (height/2),
"framerate", GST_TYPE_FRACTION, 15,1,
gst_pad_set_caps (pad, newpadcaps);
......Do I need to do something additional (like pausing the pipeline before
changing caps, or unlinking-relinking the videoscale element)? Couldn't find
much documentation on the topic.
Thanks in advance for your time :)
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