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  1. Member
    Join Date
    Feb 2020
    Location
    Nanjing City,Jiangsu Province,China
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    Hi!Recently I've got a M2TS file from one of my friends.

    It is said that it was recorded from NHK BS4K Channel,featuring 4K HLG-HDR/60P/22.2 Surround Sound (in doubt).

    But when I tried to split the file via tsMuxeR (ver.2.6.15),I got the error message saying that "Some Tracks not recognized,and they were ignored."

    Here is the infomation of the file.The video track can be split successfully.It seems that the audio track can't be recognized by the tsMuxeR.

    Who knows how to solve the problem?

    General
    ID : 0 (0x0)
    Complete name : E:\[BS4K][HLG][22.2]70th_Kouhaku.m2ts
    Format : BDAV
    Format/Info : Blu-ray Video
    File size : 50.6 GiB
    Duration : 4 h 30 min
    Overall bit rate mode : Variable
    Overall bit rate : 26.8 Mb/s
    Maximum Overall bit rate : 48.0 Mb/s

    Video
    ID : 4113 (0x1011)
    Menu ID : 101 (0x65)
    Format : HEVC
    Format/Info : High Efficiency Video Coding
    Format profile : Main 10@L5.1@Main
    Codec ID : 36
    Duration : 4 h 30 min
    Width : 3 840 pixels
    Height : 2 160 pixels
    Display aspect ratio : 16:9
    Frame rate : 59.940 (60000/1001) FPS
    Standard : Component
    Color space : YUV
    Chroma subsampling : 4:2:0 (Type 2)
    Bit depth : 10 bits
    Color range : Limited
    Color primaries : BT.2020
    Transfer characteristics : BT.2020 (10-bit)
    Matrix coefficients : BT.2020 non-constant

    Audio #1
    ID : 4352 (0x1100)
    Menu ID : 101 (0x65)
    Format : AAC LC
    Format/Info : Advanced Audio Codec Low Complexity
    Muxing mode : LATM
    Codec ID : 17-2
    Duration : 4 h 30 min
    Bit rate mode : Variable
    Channel(s) : 2 channels
    Channel layout : L R
    Sampling rate : 48.0 kHz
    Frame rate : 46.875 FPS (1024 SPF)
    Compression mode : Lossy
    Delay relative to video : -639 ms

    Audio #2
    ID : 4353 (0x1101)
    Menu ID : 101 (0x65)
    Format : AAC LC SBR PS
    Format/Info : Advanced Audio Codec Low Complexity with Spectral Band Replication and Parametric Stereo
    Commercial name : HE-AACv2
    Format settings : NBC
    Muxing mode : LATM
    Codec ID : 17-2
    Duration : 4 h 30 min
    Bit rate mode : Variable
    Channel(s) : 2 channels
    Channel layout : C L R Ls Rs LFE
    Sampling rate : 96.0 kHz
    Frame rate : 46.875 FPS (2048 SPF)
    Compression mode : Lossy
    Delay relative to video : 1 s 388 ms

    Audio #3
    ID : 4354 (0x1102)
    Menu ID : 101 (0x65)
    Format : AAC LC
    Format/Info : Advanced Audio Codec Low Complexity
    Muxing mode : LATM
    Codec ID : 17-2
    Duration : 4 h 29 min
    Bit rate mode : Variable
    Channel(s) : 2 channels
    Channel layout : L R
    Sampling rate : 48.0 kHz
    Frame rate : 46.875 FPS (1024 SPF)
    Compression mode : Lossy
    Delay relative to video : 1 s 388 ms
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  2. One workaround would be to remux the M2TS to MKV with MKVToolNix, and then use gMKVExtract to extract the audio tracks.
    Perhaps ffmpeg could do it directly using the -map command.
    Code:
    ffmpeg -i "video.m2ts" -vn -map 0:1 -c:a copy "video - audio track 1.m4a"
    This should extract the first audio track, then put "0:2" for track 2 and "0:3" for track 3 (the video track being track 0, but -vn is instructing ffmpeg to exclude the video track anyway).
    Apparently there are two stereo tracks and one 6 channels track ("C L R Ls Rs LFE"), but strangely this one is also identified as "2 channels". The duration of the third track seems to be slightly shorter. And the delays relative to the video are relatively high (639ms, 1388ms), it has to be taken into account if they have to be remuxed later on.
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  3. Member
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    Feb 2020
    Location
    Nanjing City,Jiangsu Province,China
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    Originally Posted by abolibibelot View Post
    One workaround would be to remux the M2TS to MKV with MKVToolNix, and then use gMKVExtract to extract the audio tracks.
    Perhaps ffmpeg could do it directly using the -map command.
    Code:
    ffmpeg -i "video.m2ts" -vn -map 0:1 -c:a copy "video - audio track 1.m4a"
    This should extract the first audio track, then put "0:2" for track 2 and "0:3" for track 3 (the video track being track 0, but -vn is instructing ffmpeg to exclude the video track anyway).
    Apparently there are two stereo tracks and one 6 channels track ("C L R Ls Rs LFE"), but strangely this one is also identified as "2 channels". The duration of the third track seems to be slightly shorter. And the delays relative to the video are relatively high (639ms, 1388ms), it has to be taken into account if they have to be remuxed later on.
    Thank you for your advice!
    I've just found that the file source is https://nyaa.iss.one/view/1208655,and the author said that the first audio track is the 22.2 channel track,the second being a 6 channel track and the third track is a 2 channel track.
    I thought the file format is so novel that most of the softwares can't support it properly.
    Last edited by mengshin; 8th Feb 2020 at 05:38.
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  4. And so did it work with either of those methods ?

    And does this first track really have 24 channels ? This seems hugely overkill for people with only two ears who are mostly unable to listen to their peers...
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  5. Member
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    Feb 2020
    Location
    Nanjing City,Jiangsu Province,China
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    Originally Posted by abolibibelot View Post
    And so did it work with either of those methods ?

    And does this first track really have 24 channels ? This seems hugely overkill for people with only two ears who are mostly unable to listen to their peers...
    Thank you for your advice.Perhaps my computer was too old to do the tasks,my attempts failed.

    I've uploaded the file into Google Drive.Hmm,if you are interested in J-POP,could you download it and help me find out a solution to the problem?
    Thanks a lot!!

    Link: https://drive.google.com/open?id=1SwT6NbdGhETV5A2NUQT4Oulco34q0O54
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