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Thread: MP4 file has no sound after clearing the ID tags

  1. #1

    Join Date
    Feb 2014
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    3

    MP4 file has no sound after clearing the ID tags

    Hi,
    Yesterday I cleared the ID tag of a MP4 video file (from options-> ID Tag -> Clear ) and now I realized the MP4 file plays without sound in my VLC player. I tried also some other players but the result is the same. Could someone help me? Thanks in advance.

  2. #2

    Join Date
    Feb 2014
    Posts
    3

    Re: MP4 file has no sound after clearing the ID tags

    That's very strange. The video is actually a recording of my screen but it seems that the audio from other MP4 files (not recordings) I cleared the ID-Tags plays normally. :(

  3. #3
    dBpoweramp Guru
    Join Date
    Feb 2007
    Posts
    793

    Re: MP4 file has no sound after clearing the ID tags

    Sounds very strange. What does VLC say when you hit Ctrl-J?

    ffmpeg can give you information about the streams. ffmpeg -i <filename>.

  4. #4

    Join Date
    Feb 2014
    Posts
    3

    Re: MP4 file has no sound after clearing the ID tags

    Hi,
    Here's what I get from MediaInfo:

    General
    Format : MPEG-4
    Format profile : Base Media / Version 2
    Codec ID : mp42
    File size : 45.2 MiB
    Duration : 8mn 22s
    Overall bit rate mode : Variable
    Overall bit rate : 754 Kbps
    Encoded date : UTC 2013-12-26 22:43:55
    Tagged date : UTC 2013-12-26 22:43:55

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : Baseline@L3.0
    Format settings, CABAC : No
    Format settings, ReFrames : 3 frames
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 8mn 22s
    Source duration : 8mn 22s
    Bit rate : 625 Kbps
    Width : 640 pixels
    Height : 480 pixels
    Display aspect ratio : 4:3
    Frame rate mode : Variable
    Frame rate : 30.000 fps
    Minimum frame rate : 30.000 fps
    Maximum frame rate : 30.030 fps
    Standard : NTSC
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.068
    Stream size : 37.5 MiB (83%)
    Source stream size : 37.5 MiB (83%)
    Language : English
    Encoded date : UTC 2013-12-26 22:43:56
    Tagged date : UTC 2013-12-26 22:43:56
    mdhd_Duration : 502633

    Audio
    ID : 2
    Format : AAC
    Format/Info : Advanced Audio Codec
    Format profile : LC
    Codec ID : 40
    Duration : 8mn 22s
    Source duration : 8mn 22s
    Bit rate mode : Variable
    Bit rate : 126 Kbps
    Maximum bit rate : 169 Kbps
    Channel(s) : 2 channels
    Channel positions : Front: L R
    Sampling rate : 44.1 KHz
    Compression mode : Lossy
    Stream size : 7.53 MiB (17%)
    Source stream size : 7.53 MiB (17%)
    Language : English
    Encoded date : UTC 2013-12-26 22:43:56
    Tagged date : UTC 2013-12-26 22:43:56
    mdhd_Duration : 502666

    VLC recognizes two streams however there's no audio playback.
    I imported the file back into Camtasia but it didn't show the audio stream so I couldn't do anything.
    Also, I extracted the audio but I couldn't convert it nor play it. It seems corrupted.

    Anyway I think nothing can be done now. Audio is lost forever. :(

  5. #5
    dBpoweramp Guru
    Join Date
    Feb 2007
    Posts
    793

    Re: MP4 file has no sound after clearing the ID tags

    Quote Originally Posted by Nineteen View Post
    [...]
    Encoded date : UTC 2013-12-26 22:43:56
    Tagged date : UTC 2013-12-26 22:43:56
    Strange, it doesn't even say it has been changed ever ...

    Tried ffmpeg?

    ffmpeg -i filename.mp4 -acodec copy filename_audioonly.m4a

    Error messages?

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