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4 channel audio

    Question

  • I have an AVI file that contains 4 channel AC3 audio.  Also have ac3filter installed, active, and working.  If I set the encoding to stereo it encodes fine.  If I set it to the next closest thing, "5.1" it errors with unknown error.  How am I supposed to encode 4 channel audio?

    Thanks.

    JR

    EDIT: By the way, my existing 4 channel audio is AC3 448Kbps, 48Khz, 16 bits.  That said ac3filter is set to "no change" on the filter but do not see a say 4.0 audio setting on the codec anyway as a choice.



    • Edited by jriker1 Monday, March 19, 2012 11:35 AM
    Friday, March 16, 2012 11:04 PM

All replies

  • By the way, over 200 hits and no responses.  Thought I would provide some additional information.  From what I have been researching this seems like a 3.1 audio source.  I think it's left, right, center, and I think sub since that's the .1.

    Pulled the following details:

    Size ........: 301914368 bytes

    -----------------------------------------
    First Frame Info
    SampleRate ..................: 0 (48000 KHz)

    BitRate .....................: 15 (448 Kb/s)
    Version (bsid) ..............: 8 (Standard)
    Bit Stream mode (bsmod) .....: 0 (main audio service: complete main, CM)
    Audio coding mode (acmod) ...: 5 (3/1 - L, C, R, S)
    Center Mix Level ............: 0 (0.707, -3.0 dB)
    Surround Mix Level ..........: 0 (0.707, -3 dB)
    Low frequency effects channel: 0 (Not present)
    Dialogue normalization ......: - 28 dB
    RF atenuattion ..............: 11.76 dB Frame: 1
    Languaje ....................: 0 (Not present)
    Audio Production Info .......: 0 (Not present)
    CopyRight bit ...............: 1
    Original bit ................: 1
    Timecode1 ...................: 0 (Not present)
    Timecode2 ...................: 0 (Not present)
    Additional Bsi ..............: 0 (Not present)
    Block switch flags ..........: 0
    Dither flags ................: 15
    Dynamic Range gain ..........: 6.01 dB Frame: 1
    --------------------------------------------- Revised Info
    RF Ov. Pr.
    min/max : -13.85 / 12.03 dB
    Dyn. Range min/max : -13.85 / 6.01 dB
    Total Frames ......: 168479
    Duration ..........: 5391.328 seconds. ( 1 h. 29 m. 51.328 s.)
    ------------------------------------------------- End Info

    WIth eac3to it extracted the waves called R.wav, L.wav, C.wav, and BC.wav whatever the last is.

    In MediaInfo it shows Left, Right, Center, and Side Center?

    In MediaInfo it shows left right center and Side Center?


    Audio
    ID                               : 1
    Format                           : AC-3
    Format/Info                      : Audio Coding 3
    Mode extension                   : CM (complete main)
    Codec ID                         : 2000
    Duration                         : 1h 29mn
    Bit rate mode                    : Constant
    Bit rate                         : 448 Kbps
    Channel(s)                       : 4 channels
    Channel positions                : Front: L C R, Side: C
    Sampling rate                    : 48.0 KHz
    Bit depth                        : 16 bits
    Compression mode                 : Lossy
    Stream size                      : 288 MiB (19%)
    Alignment                        : Aligned on interleaves
    Interleave, duration             : 64 ms (1.53 video frames)
    Interleave, preload duration     : 192 ms
    Title                            : ass T81 3_1ch 448Kbps DELAY 0ms

    Thoughts?

    JR


    • Edited by jriker1 Wednesday, March 21, 2012 12:04 AM
    Tuesday, March 20, 2012 11:49 PM