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  1. Hi,

    I have an MKV file (remux from a Bluray) and it's Media info is pasted below. I need to extract the audio lossless with .m4a and/or encode just the audio with quicktime AAC (qaac.exe). I tried ffmpeg to extract but it throws error "Could not find tag for codec dts in stream #0".

    Please advise, thanks!!

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L4.1
    Format settings : CABAC / 4 Ref Frames
    Format settings, CABAC : Yes
    Format settings, RefFrames : 4 frames
    Format settings, GOP : M=3, N=12
    Codec ID : V_MPEG4/ISO/AVC
    Duration : 2 min 50 s
    Bit rate mode : Constant
    Bit rate : 35.0 Mb/s
    Width : 1 920 pixels
    Height : 1 080 pixels
    Display aspect ratio : 16:9
    Frame rate mode : Constant
    Frame rate : 24.000 FPS
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.703
    Stream size : 693 MiB (87%)
    Default : Yes
    Forced : No

    Audio
    ID : 2
    Format : DTS XLL
    Format/Info : Digital Theater Systems
    Commercial name : DTS-HD Master Audio
    Codec ID : A_DTS
    Duration : 2 min 50 s
    Bit rate mode : Variable
    Bit rate : 4 877 kb/s
    Channel(s) : 6 channels
    Channel layout : C L R Ls Rs LFE
    Sampling rate : 48.0 kHz
    Frame rate : 93.750 FPS (512 SPF)
    Bit depth : 24 bits
    Compression mode : Lossless
    Delay relative to video : 91 ms
    Stream size : 98.9 MiB (12%)
    Title : DTS-HD MA 5.1
    Language : Hindi
    Default : Yes
    Forced : No
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  2. To convert the DTS to AAC using ffmpeg:
    Code:
    ffmpeg -i "input.mkv" -map 0:a:0 "output.m4a"
    To convert the DTS to AAC using ffmpeg while keeping video and mkv container:
    Code:
    ffmpeg -i "input.mkv" -map 0 -c:v copy -c:a aac "output.mkv"
    To convert audio to AAC using qaac:
    Code:
    ffmpeg -i "input.mkv" -map 0:a:0 -f wav - | qaac - -o "output.m4a"
    Quote Quote  
  3. Thanks a lot sneaker that worked great...

    As I need 448k AAC, I ran the below which worked fine:

    ffmpeg -i MyVideo.mkv -map 0:a:0 -f wav - |qaac64 -i -c 448k - -o output448.m4a
    is there any better way to do OR my command just fine?

    Thanks again.
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