Re: [DCP-o-matic] Prores 4444 & KDM keys

Hi all, One thing that is also useful is to measure the loudness of the source material (according to the EBU R128 specification). Unfortunately there is no standard loudness value in LUFS defined for cinema[1] as there is for TV broadcast. According to my investigations of about 100 professionally mastered DCP:s distributed in the wild the average lies somewhere around -24 LUFS. You can use the ebu128 filter in ffmpeg to check the loudness of a video or audio file: cat <videofile> | ffmpeg -i - -filter_complex ebur128=peak=true -f null - To check on a DCP with audio mxfs split into reels, you could use shell wild cards, e.g.: cat Naganting_maste_ga_sonder_FTR_F_SV-EN_51_SV_2k_20140121_FT_audio_0* | ffmpeg -i - -filter_complex ebur128=peak=true -f null - The nice thing about the "Integrated loudness" (I) is that it changes along with the audio gain. E.g. If you have material with an integrated loudness of -16 LUFS (too loud), change the gain -8 dB to get -24 LUFS. 1. Discussed extensively here: http://www.gearslutz.com/board/post-production-forum/768373-cinema-playback… Best, -mattias