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A
ap-2112
Participant
May 12, 2023
Answered

Exporting Constant Audio Bitrate with AAC on H.264 Video

  • May 12, 2023
  • 2 replies
  • 3131 views

Can someone please provide information on how I can export a H.264, MP4 video file with AAC for audio but with a constant bitrate from Premiere?  If not directly from Premiere, please let me know how else this could be done.  I have a vendor requesting this exact spec for videos and I have been unable to produce a satisfactory file for them.

 

Thanks,


Aaron

    Correct answer ap-2112

    I have confirmed with Adobe support that a constant audio bitrate is not currently possible for an H.264 video.  This request has been submitted to the engineering team.

    2 replies

    A
    ap-2112AuthorCorrect answer
    Participant
    May 18, 2023

    I have confirmed with Adobe support that a constant audio bitrate is not currently possible for an H.264 video.  This request has been submitted to the engineering team.

      Glenda29038675honx
      Glenda29038675honx
      Inspiring
      November 7, 2023

      Looking for an update on this, just adding my name to the list of watchers.   

      S
      smrpix
      Participating Frequently
      May 12, 2023

      Audio bitrates are always constant.  You can twirl down the Audio tab in the export window to set it. If you want the video bitrate constant as well, twirl down the video tab in the export window, scroll down to Bitrate Settings, choose CBR and set the datarate.

      A
      ap-2112Author
      Participant
      May 12, 2023

      Many audio codecs are variable by design.  However, I also assumed that Premiere/Media Encoder would be using a constant bitrate in this instance as well due to there not being any option or toggle.  The exported file details always show the audio bitrate as variable even if the video bitrate is set to constant.

      I even tried exporting a straight AAC file.  Using MediaInfo, I get this info on the exported file:

      General
      Complete name : F:\Outro.aac
      Format : ADTS
      Format/Info : Audio Data Transport Stream
      File size : 625 KiB
      Overall bit rate mode : Variable

      Audio
      Format : AAC
      Format/Info : Advanced Audio Codec
      Format version : Version 4
      Format profile : LC
      Bit rate mode : Variable
      Channel(s) : 1 channel
      Channel positions : Front: C
      Sampling rate : 48.0 kHz
      Frame rate : 46.875 FPS (1024 SPF)
      Compression mode : Lossy
      Stream size : 625 KiB (100%)



       

      Shows variable when used as part of a video file as well.

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