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  1. Member
    Join Date
    Sep 2006
    United States
    Search Comp PM
    Remove Audio from an existing Video Track and replace it with Externally recorded Audio (no disturbance from people who are sitting next to camcorder). This for a speech that was given at a Non-Profit.

    When I put in the externally recorded Audio, it went out of sync with the video. So I figured out that it was because of VFR (Variable Frame Rate). I confirmed this by editing about 1 hour of video from 6 hours and overlaying the audio. I think this sample size is not enough.

    Do I have to convert to a CFR of 60? Does this affect the audio bit rate (128)?

    I am also looking for a website that can do this online (have about 9gb - 6 hours of video). But I think no website allows more than 1gb of data upload. So I used Handbrake to the sample conversion.

    Would really appreciate any help that can save time and improve quality.

    Win 10 Home
    Inspiron 7737
    Intel(R) Core(TM) i7-4510U CPU @ 2.00GHz, 2001 Mhz, 2 Core(s), 4 Logical Processor(s)
    RAM 8gb

    Format : MPEG-PS
    File size : 1.38 GiB
    Duration : 46 min 22 s
    Overall bit rate mode : Variable
    Overall bit rate : 4 261 kb/s

    ID : 224 (0xE0)
    Format : MPEG Video
    Format version : Version 2
    Format profile : Main@High 1440
    Format settings : BVOP
    Format settings, BVOP : Yes
    Format settings, Matrix : Default
    Format settings, GOP : M=3, N=12
    Duration : 46 min 22 s
    Bit rate mode : Variable
    Bit rate : 3 952 kb/s
    Maximum bit rate : 4 000 kb/s
    Width : 1 440 pixels
    Height : 808 pixels
    Display aspect ratio : 16:9
    Frame rate : 29.970 (30000/1001) FPS
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Compression mode : Lossy
    Bits/(Pixel*Frame) : 0.113
    Time code of first frame : 00:00:00:00
    Time code source : Group of pictures header
    GOP, Open/Closed : Open
    GOP, Open/Closed of first frame : Closed
    Stream size : 1.28 GiB (93%)

    ID : 192 (0xC0)
    Format : MPEG Audio
    Format version : Version 1
    Format profile : Layer 2
    Duration : 46 min 22 s
    Bit rate mode : Constant
    Bit rate : 224 kb/s
    Channel(s) : 2 channels
    Sampling rate : 44.1 kHz
    Frame rate : 38.281 FPS (1152 SPF)
    Compression mode : Lossy
    Stream size : 74.3 MiB (5%)

    Last edited by videohelpuser; 22nd Dec 2019 at 20:03.
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  2. Member Cornucopia's Avatar
    Join Date
    Oct 2001
    Deep in the Heart of Texas
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    That video is NOT vfr, it is cfr (29.97).

    You are mistaking that with vbr. Bitrate. Has nothing to do with your sync issue, other than possible playback bottleneck on a really weak device.

    Audio bitrate is independent from video bitrate. Note that your current mp2 audio is 224kbps, not 128. Don't go down to 128 unless you want it to sound crappier.

    Since your vid is already cfr, going to 60 doesn't gain you anything, and also makes the bitrate's job harder.

    Your sync issues are due to something else - maybe wrong interpretation settings in the editor...

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  3. aBigMeanie aedipuss's Avatar
    Join Date
    Oct 2005
    666th portal
    Search Comp PM
    what camera was used? it's 30p mpeg-2 1440x808. not a normal size. and is that the original audio spec listed? mp2 at 44.1 khtz? 38.281fps? again unusual. most is 48 khtz.
    "a lot of people are better dead" - prisoner KSC2-303
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  4. Member
    Join Date
    Sep 2006
    United States
    Search Comp PM
    @Cornucopia - Thx for those insights. I had mistaken VFR with VBR.
    @aedipuss - It is a very old Camcorder. I guess that could be the sync issue source. Every time I had used HandBrake and edited in the audio it would sync perfectly. I guess it is time to buy a good camcorder - predominantly going to be used for indoors - speech recording.
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