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Marianarg
Known Participant
December 22, 2023
Question

loudness changes when i export a mxf file

  • December 22, 2023
  • 2 replies
  • 4397 views

Hello

I have a problem that I can't solve and it drives me crazy. I have to make an episode for a TV channel where they request an MXF with ten channels and stereo mix. It must not exceed the EBU-128 standard (-23 LUFS). I use the post-production audio leveled and not exceeding the -23 LUFS. The problem arises when I export them into premiere, the results often differ significantly.

 

When creating multichannel sequences, I select 10 channels and 10 mono tracks, pan them, and assign a channel for each track. I modify stereo audio to be mono and export MXF indicating those 10 channels.

Generally, upon re-importing them into Premiere, it shows around -26 LUFS. 

 

When I send the file to the television station, it gets rejected, because of the audio is around - 19 lufs. 

 

I work on a windows 11, with Intel I9 processor and 32 GB of Ram.

 

Any idea where the problem might be?

 

Thanks a lot! 

 

I need to find a solution asap! Thanks

 

    2 replies

    M
    MarianargAuthor
    Known Participant
    December 25, 2023

    nobody?? really?

     

    J
    Jarle Leirpoll
    Legend
    December 26, 2023

    Sorry, the notification ended up in the spam folder. But we need more info. When you say "Generally, upon re-importing them into Premiere, it shows around -26 LUFS" How are you measuring that?

     

    1. What are your sequence settings? 
    2. What are the Export settings?

     

    Screenshots tell us much more than a lot of words.

    M
    MarianargAuthor
    Known Participant
    January 2, 2024

    Hi,

    I'm sending you screenshots. As you can see, the sequence is multi-channel, with 10 mono audio tracks, panned (left-right). Tracks 1 and 2 output to channels 1 and 2, tracks 3 and 4 to 1, 2, 3, 4, tracks 5 and 6 to 1, 2, 5, 6, etc. (tracks 1 and 2 are the program master, and it's a channel TV requirement to be allways present in the channel assignment).

    The audios are originally mono and in the export settings I indicate that I want 10 channels.

    To measure, I use the Loudness Radar. I either apply it to the master track or measure the first track (I'm not sure if I'm doing it right but it gives me values of -20 (master track) and -25 (the first track). The thing is, when importing the export file and applying the Loudness Radar the values hover around -9 (master track) and -26 LUFS (the first track). 

    I think it's something that happens when I do the export, but I can't figure out what.

    Thanks for the help! Happy New Year!



    R Neil Haugen
    R Neil Haugen
    Legend
    December 22, 2023

    @Jarle Leirpoll @Warren Heaton10841144 @Michael Grenadier  ?

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