A function that will be called when a (considered oldest) buffer can be muxed. If all pads have reached EOS, this function is called with %NULL buffer and %NULL data.
buffer
data
the #GstCollectPads that triggered the callback
the #GstCollectData of pad that has received the buffer
the #GstBuffer
A function that will be called when a (considered oldest) buffer can be muxed. If all pads have reached EOS, this function is called with %NULL
bufferand %NULLdata.