Es out now takes care of settings the audio replay gain from meta data
if the demuxer has not set them. Added a demux2 control DEMUX_HAS_UNSUPPORTED_META. A demuxer should return true only when the format support extra meta data (id3/ap2/...) but it does not read them itself. The input will then call a "meta reader" (demuxer modifications on the way).
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