Cannot zoom video when the state is paused

[Bruce Tsai]

My first idea is to create your own videosink element that integrates videocrop functions.
In paused state, get “last-sample” (video frame rendered on screen) for video cropping.
Then render cropped frame again.

--
Yi-Lung (Bruce) Tsai
wagamama.tsai at gmail.com





> On Apr 13, 2017, at 10:30 PM, silver <sxhsxhsxh66 at gmail.com> wrote:
> 
> Hello guys,
> 
> I construct one rtsp pipeline and one hls pipeline. Both of them use
> autovideosink. Now I want to add a zoom function by applying videocrop
> element. It works for both pipelines when the video is playing. But once I
> pause the stream, zoom isnot available until I continue to play the video. I
> understand that it's reasonable for a paused state to prevent pushing data.
> But I still want to search for a way to realize the zoom when paused.
> 
> I attach my two pipeline here:
> rtspsrc name=src latency=1000 buffer-mode=1 protocols=4  src. ! queue !
> rtph264depay ! avdec_h264 ! videocrop name=cropper top=0 left=0 right=0
> bottom=0 ! autovideosink  src. ! queue ! rtpmp4gdepay ! aacparse ! faad !
> volume name=vol volume=0.00000001 ! autoaudiosink
> souphttpsrc name=src ! hlsdemux ! tsdemux name=u  u. ! queue ! h264parse !
> avdec_h264 ! videoconvert ! videocrop name=cropper top=0 left=0 right=0
> bottom=0 ! videoscale ! autovideosink  u. ! queue ! aacparse ! faad ! volume
> name=vol volume=0.00000001 ! audioconvert ! audioresample ! autoaudiosink
> 
> I searched in this forum for hours but nothings found very helpful.
> Any help would be appreciated!
> 
> 
> 
> --
> View this message in context: http://gstreamer-devel.966125.n4.nabble.com/Cannot-zoom-video-when-the-state-is-paused-tp4682654.html
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