Supported audio formats

Last updated: January 20, 2017

The following sections outline which audio formats are supported by BrightSign players.

XTx43, 4Kx42, XDx33, XDx32, XDx30, HDx23, LS423, HDx22, HDx20, HDx10, LSx22, AU320:

  • AAC audio in H.264 Video (CBR only; no VBR support)
  • MP3 audio files as stereo or mono at a 48 kHz or 44 kHz sampling rate (MPEG1/MPE2 Video)

Specs for mp3 files:

max. sampling rate - 48kHz
max. bit depth - 16Bit
max. bitrate - 320kBit/s

  • WAV audio files as stereo or mono (32-bit/96kHz output is supported on all models except the HDx20, HDx10, and AU320) 
  • M4A and AAC audio files (requires BrightAuthor version 4.3.0.x or later; not supported in BSN presentations)
  • Dolby Digital (AC3) 5.1 audio in an MPEG2 or MOV video (pass-through over HDMI or TOSLINK w/ expander). Other multichannel audio formats may work as pass-through, but they are not officially supported.

Important: All tracks must have the same sampling rate if you plan to output multiple audio tracks simultaneously (from either audio or video files). 

XTx43, 4Kx42, XDx33, XDx32, XDx30, HDx23, HDx22, LS423:

  • FLAC and Vorbis codecs (along with the .ogg file format)


  • MP3 audio files as stereo or mono at a 48KHZ sampling rate


  • MP3 audio files as stereo or mono at a 48KHZ or 44KHZ sampling rate
  • WAV audio files as stereo or mono
  • Dolby Digital (AC3) 5.1 audio in a video file (decode or raw pass-through)
  • PCM Audio in a video file (LPCM)



  • To play videos with surround sound, you must encode an AC3 audio layer along with an MPEG2 video layer.
  • BrightSign players do not decode surround sound (AC3) audio; but the audio can be passed through to a decoding device over HDMI of SPDIF.
  • If you are using Adobe Premiere to encode the video with the SurCode codec for audio, ensure that SurCode is in BluRay mode, not Dolby Digital mode.
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  • 0

    NOTE: The Gefen HDMI to HDMI Plus Audio converter, (SKU: GTV-HDMI-2-HDMIAUD, UPC: 845344056111) only supports multichannel analog output for LPCM 5.1 audio input.  It does NOT output analog for compressed audio formats.

    See pages v and 8 in the manual

    When you play the file on your laptop, unless your sound hardware is set to bitstream the audio output, it is decoding the AAC or AC3 and outputting multichannel LPCM.  That's why the Gefen box can decode it to analog.  It also does not work when audio is bitstreamed from a capable computer-based player, as bitstreaming does the same thing the BrightSign player does - it passed the encoded audio directly out to the device, rather than decoding it first.

    When you play it through the BrightSign player, the player doesn't decode the audio, so the encoded AAC or AC3 goes to the Gefen device which cannot decode encoded audio.

    The Gefen manual states this on page v, "This product does not decode audio formats."

    It does not work when sent multichannel AAC, Dolby Digital/AC3, DTS, or other encoded audio sources when sent from a hardware Blu-ray/DVD player (that isn't set to downmix to stereo), or a BrightSign player in Pass through mode.

    Depending on your situation, it may work to use multiple BrightSign players using BrightWall or synchronized presentations, each outputting two channels of audio.  Your audio will need to be split into separate stereo files.

  • 0
    Luke Smith

    Aside from the fact that support for AAC audio is only offered when encoded at a constant bit rate is ridiculous (how hard can it really be to include support for variable bit rates?), could you take a moment to spell out VBR and CBR on this page so that the people who are in the field and using these products don't have to guess at what you mean? Thanks.

  • 0

    what is the max bit rate for audio only playback using HD223?

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