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27 lines
1 KiB
Text
27 lines
1 KiB
Text
Video Mixer
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A generice video mixer, it blends the ayuv buffers from all pads onto
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a new buffer. The new buffer has by default a checkerboard pattern but
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its color can be changed with a property.
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The mixer can mix streams with different framerates and video sizes. It
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uses the duration value of the buffer to schedule the rendering of the
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buffers. For streams with a different resolution than the final output
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resolution one can specify the position of the top left corner where this
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image should be placed with the pad properties xpos and ypos.
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The overall alpha value of a stream can also be specified with a pad
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property.
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By default, the streams are blended in the order that the pads were
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requested from the element. This can be overridden by changing the
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zorder pad property of the stream, a stream with lower zorder gets
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drawn first.
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TODO
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----
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- really implement zorder
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- take I420 yuv as well
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- output AYUV if possible.
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- implement different blend modes, some code is already done
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- use filter caps on srcpad to decide on the final output size
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