Let the input bufferize more data when possible.
The input will try to read 20% faster the source until a certain amount of data is buffered by the fifo of the decoders (for now 10Mbytes or 500kbytes when OPTIMIZE_MEMORY is defined for the sum of all fifos). This buffering adds up to pts_delay without any additional delay but can only work when VLC controls the source pace. It has a drawback with the current way the meta data works: they are seen too soon.
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