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  1. Hello. Does someone know how to fix a choppy / laggy video? It's not choppy because of slow hardware, rather because of faulty encoding / editing. Sometimes it just plays like with a framerate of 3 FPS. Unfortunately I don't have a chance to get the original source video. So, maybe someone knows a trick or a tool to fix the video?

    Here are some specs of the mentioned file:
    Video: XVID / Avi, 672x504, 23.976023 FPS
    Audio: MPGA, Stereo, 48000 Hz, 128 kb/s (only the videostream is choppy)
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  2. Always Watching guns1inger's Avatar
    Join Date: Apr 2004
    Location: Miskatonic U
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    Start with a full Tree view from mediainfo of the file.

    Next, try loading it into avi demux and see if you get any warnings. If it asks to rebuild anything, let it.

    Next, try going through the lagging parts frame at a time in virtualdub (assuming it loads). Are all the frames there, or have some frames been duplicated ?
    Read my blog here.
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  3. 1.
    Code:
    General
    Complete name                    : C:\dub-af-edit 7.avi
    Format                           : AVI
    Format/Info                      : Audio Video Interleave
    File size                        : 700 MiB
    Duration                         : 3h 10mn
    Overall bit rate                 : 514 Kbps
    Writing application              : VirtualDubMod 1.5.4.1 (build 2178/release)
    Writing library                  : VirtualDub build 32706/release
    
    Video
    ID                               : 0
    Format                           : MPEG-4 Visual
    Format profile                   : Advanced Simple@L5
    Format settings, BVOP            : Yes
    Format settings, QPel            : No
    Format settings, GMC             : No warppoints
    Format settings, Matrix          : Default (H.263)
    Muxing mode                      : Packed bitstream
    Codec ID                         : XVID
    Codec ID/Hint                    : XviD
    Duration                         : 3h 10mn
    Bit rate                         : 376 Kbps
    Width                            : 672 pixels
    Height                           : 504 pixels
    Display aspect ratio             : 4:3
    Frame rate                       : 23.976 fps
    Resolution                       : 8 bits
    Colorimetry                      : 4:2:0
    Scan type                        : Progressive
    Bits/(Pixel*Frame)               : 0.046
    Stream size                      : 513 MiB (73%)
    Writing library                  : XviD 1.2.1 (UTC 2008-12-04)
    
    Audio
    ID                               : 1
    Format                           : MPEG Audio
    Format version                   : Version 1
    Format profile                   : Layer 3
    Mode                             : Joint stereo
    Format_Settings_ModeExtension    : MS Stereo
    Codec ID                         : 55
    Codec ID/Hint                    : MP3
    Duration                         : 3h 10mn
    Bit rate mode                    : Constant
    Bit rate                         : 128 Kbps
    Channel(s)                       : 2 channels
    Sampling rate                    : 48.0 KHz
    Stream size                      : 174 MiB (25%)
    Alignment                        : Aligned on interleaves
    Interleave, duration             : 42 ms (1.00 video frame)
    Interleave, preload duration     : 504 ms
    2. Avidemux doesn't show any warnings, but it asks: "Packed Bitstream detected. Do you want me to unpack it?"

    3. - "Are all the frames there?" How can i check this?
    - "or have some frames been duplicated?" In the lagging parts of the video, some frames look very similar, but they don't seem to be exact duplicates.

    I'm afraid that the video seems to be an assembly of many different clips with differents formats cobbled together. Probably it's not worth the efforts. I just thought there is maybe a program which can "repair" it automatically.
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  4. Member Soopafresh's Avatar
    Join Date: Jan 2004
    Location: United States
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    "Quality is cool, but don't forget... Content is King!"
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  5. Thanks for the help soopa, but unfortunately this tools didn't solve the problem.
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  6. aBigMeanie aedipuss's Avatar
    Join Date: Oct 2005
    Location: 666th portal
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    try having avidemux re-write the file. import source, set video and audio to copy and type to avi. click save video.

    see if the new one plays.
    --
    "a lot of people are better dead" - prisoner KSC2-303
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  7. Always Watching guns1inger's Avatar
    Join Date: Apr 2004
    Location: Miskatonic U
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    I hope it is pretty much static pages, because that bitrate at that resolution isn't going to be pretty.
    Read my blog here.
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