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  1. Hello

    I have a video what i recorded by webcam.
    And the video jump some second frekvently, maybe cause of the lag when recorded. Now i have sound more than one hour, and a video half an hour.
    Can i somehow sync the sound?
    I try to delete the audio where the frames jump, but no luck.
    Any suggestion?
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  2. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    You'll probably have split it into sections and sync each piece separately
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  3. I am newbie, how i can do it?
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  4. Maybe split every five minute, and try to move the sound to match?
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  5. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    Probably something like Avidemux. Open your video, leave the video as "copy" (on the left)
    and set the audio to PCM. You can use Audio Output /filters/shift audio. You can set - or + to advance/delay the audio
    use the A and B markers to set the clip for the first piece that remains in sync.
    Save it as clip 1. Move the A and B markers to the next part, recheck (by playing it) and adjust the sync and continue until the end.

    Why would a webcam lag the system while recording? Perhaps you should use mediainfo (in View>text) to examine the video/audio properties and post
    the information here
    Last edited by davexnet; 26th Oct 2021 at 16:33.
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  6. Hello

    This is the video info.

    General
    Format : MPEG-4
    Format profile : Base Media
    Codec ID : isom (isom/iso2/mp41)
    File size : 210 MiB
    Duration : 1 h 9 min
    Overall bit rate mode : Variable
    Overall bit rate : 423 kb/s
    Writing application : Lavf57.83.100

    Video
    ID : 1
    Format : HEVC
    Format/Info : High Efficiency Video Coding
    Format profile : Main@L5.1@Main
    Codec ID : hev1
    Codec ID/Info : High Efficiency Video Coding
    Duration : 34 min 10 s
    Bit rate : 824 kb/s
    Width : 1 920 pixels
    Height : 1 080 pixels
    Display aspect ratio : 16:9
    Frame rate mode : Variable
    Frame rate : 20.000 FPS
    Minimum frame rate : 19.608 FPS
    Maximum frame rate : 20.000 FPS
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Bits/(Pixel*Frame) : 0.020
    Stream size : 202 MiB (96%)
    Codec configuration box : hvcC

    Audio
    ID : 2
    Format : AAC LC
    Format/Info : Advanced Audio Codec Low Complexity
    Codec ID : mp4a-40-2
    Duration : 1 h 9 min
    Bit rate mode : Variable
    Bit rate : 16.0 kb/s
    Maximum bit rate : 128 kb/s
    Channel(s) : 1 channel
    Channel layout : C
    Sampling rate : 16.0 kHz
    Frame rate : 15.625 FPS (1024 SPF)
    Compression mode : Lossy
    Stream size : 7.96 MiB (4%)
    Default : Yes
    Alternate group : 1
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