Comments

fr0sty wrote on 8/28/2018, 4:23 PM

Are you talking about audio levels?

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Aiki wrote on 8/28/2018, 4:51 PM

Yes, oui

Marco. wrote on 8/28/2018, 4:56 PM

Maximum digital level is 0 dB. It doesn't matter which container you use. It may matter which audio encoder you use because chances are there could be some kind of auto-gain setting envolved.

Aiki wrote on 8/28/2018, 5:33 PM

Merci, thank you.

rraud wrote on 8/29/2018, 9:02 AM

Yes, the absolute maximum level is -0.0dBFS. However, the 'loudness' level is important and calculated differently. For broadcast submission, loudness (usually) must be at -24LUFS integrated (+-2) in the US. The 'recommended' level for on-line content and DVD/BU is -18 to -14LUFS. YouTube and other sites of that type, will lower the level in their re-encode process if it exceeds an arbitrary max level. OTOH, some sites (Spotifiy) will increase the loudness level, if it is low, others (YT) will not. I'm not sure about Vimeo either way.

Aiki wrote on 8/29/2018, 12:12 PM

I made the first compression with the digital standard of - 18 db, the customer must be used to listening to video at 0 db. Coming from broadsast or the norm was + 4 db (betacam).

rraud wrote on 8/29/2018, 12:41 PM

Prior to using the ATSC and EBU loudness measurement, it was typically a reference level (test tone) at -20dBFS with program audio peaks not exceeding -10dB (-18 / -8 EBU). On-line, DVDs and such, peaks around -3 to -6dBFS. The Betacam's +4dB was a line level voltage measurement (1.2 volts = 0VU).