Le nonidi 29 messidor, an CCXXII, Clément Bœsch a écrit : > We add a discussion several time for real time with that filter. If we do > a 2-pass, that's simply because it's "more efficient". Typically, doing > some live normalization can be done easily (we had patches for this): > ebur128 already attaches some metadata to frames, so a following filter > such as volume could reuse them, something like -filter_complex > ebur128=metadata=1,volume=metadata.
I believe you are wrong in this paragraph: we do two passes for normalization because that is the only way of doing it without distortions: the level of volume adjustment depends on the whole stream. Normalization can be done in a single pass with distortions, but currently, no filter is capable of smoothing the measures computed by ebur128 to make the distortions inaudible. Patch welcome. Regards, -- Nicolas George
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