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Thread: Jerky 4K

  1. #1
    Join Date
    Mar 2016
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    Market Drayton, England
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    3

    Default Jerky 4K

    I have been a stills photographer for many years, with some experience in video editing. However, recently I bought a Canon XC10 for recording video in 4K. The problem I am having is this; whilst the 4k recording (onto Lexar Cfast 2.0) looks good on the camera’s display and indeed looks perfect when displayed on a 4k TV using an HDMI transfer cable but when I transfer the clips from the cfast card to my PC using the Canon Utility application, the video is very “jerky”. After importing the MXF files using the Canon Utility, I then convert to mpeg4 using the Pavtube MXF converter application.
    The problem is most apparent when panning (however slow) and when there is a moving object in view, such as a vehicle. This problem does not happen with HD clips, which play smoothly.
    I have scoured the internet, without success to find a solution to this problem, so I’m really hoping a forum member can point me in the right direction.

  2. #2
    Join Date
    Jan 2008
    Location
    Canada
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    1,457

    Default

    Well, either the quality of the video itself is being reduced during the conversions you described or your display can't keep up with the converted file format - does the bitrate of the converted file match the original?

  3. #3

    Default

    Do you by any chance convert to an interlaced format?

  4. #4
    Join Date
    Mar 2016
    Location
    Market Drayton, England
    Posts
    3

    Default

    Thank you for your very quick response. The issue is now resolved, I have reduced the camera bitrate from 305 to 205, even though the cfast card accepts up to 510 Mb/s. When I run a clip in the Canon XF-AVC utility, the clips are very jerky. This effect is still present after processing by the Pavtube MXF convertor. However, I now find that importing the shaky video into Cyberlink Powerdirector and playing the clips, the video is smooth and even better after rendering. I am puzzled as to why this occurs but I am happy that the final production is silky smooth. I will keep the camera bitrate at 205.
    Thank you very much for your advice and to the other members who responded.

  5. #5
    Join Date
    Mar 2016
    Location
    Market Drayton, England
    Posts
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    Default

    No I do not convert to interlaced but am copying a reply sent to another forum member as follows:
    Thank you for your very quick response. The issue is now resolved, I have reduced the camera bitrate from 305 to 205, even though the cfast card accepts up to 510 Mb/s. When I run a clip in the Canon XF-AVC utility, the clips are very jerky. This effect is still present after processing by the Pavtube MXF convertor. However, I now find that importing the shaky video into Cyberlink Powerdirector and playing the clips, the video is smooth and even better after rendering. I am puzzled as to why this occurs but I am happy that the final production is silky smooth. I will keep the camera bitrate at 205.
    Thank you very much for your advice and to the other members who responded.

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