videotestsrc: Document the num-buffers property
It's not obvious from the existing docs that this option exists, nor that it can be used to give a pipeline an exact length in video frames. https://bugzilla.gnome.org/show_bug.cgi?id=777647
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* of formats. The video test data produced can be controlled with the "pattern"
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* of formats. The video test data produced can be controlled with the "pattern"
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* property.
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* property.
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*
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*
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* By default the videotestsrc will generate data indefinitely, but if the
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* #GstBaseSrc:num-buffers property is non-zero it will instead generate a
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* fixed number of video frames and then send EOS.
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*
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* ## Example launch line
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* ## Example launch line
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* |[
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* |[
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* gst-launch-1.0 -v videotestsrc pattern=snow ! video/x-raw,width=1280,height=720 ! autovideosink
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* gst-launch-1.0 -v videotestsrc pattern=snow ! video/x-raw,width=1280,height=720 ! autovideosink
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