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charlesthestoryteller
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Q: Canon XA20 has vertical lines?

I purchased a Canon XA20 and hired a gentlemen to video tape a wedding with me.  Unfortunately the Canon XA20 footage seems to have unusual vertical limes throughout the video.  I will include a couple screen clips.  Its seems the video was recorded in 28 MBPS LPCM (59.94P) mode.  I am including some screen shots.  It doesn't seems to be filming this during the preview of the recording.  However when youreplay the video you can see the lines clearly, which scares me to think this is on the RAW footage.  I tried importing the footage into Final Cut Pro X and it still looks the same.  I also imported the images through ClipWrap and nothing is working.  Any thoughts?

 

Screen Shot 2014-03-23 at 4.38.00 PM.pngScreen Shot 2014-03-23 at 4.39.52 PM.png

Final Cut Pro X, OS X Mavericks (10.9.2), I just got this new iMac as well

Posted on Mar 23, 2014 2:02 PM

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charlesthestoryteller

Q: Canon XA20 has vertical lines?

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  • by Nate B 242,

    Nate B 242 Nate B 242 May 17, 2014 2:42 PM in response to charlesthestoryteller
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    May 17, 2014 2:42 PM in response to charlesthestoryteller

    I'm not completely positive, and maybe someone else can shed more light onto this issue, but I'd guess that those lines would have been caused by using an SD card that isn't fast enough to support a 28 mbps video transfer. I could be mistaken, but I believe that tears like the ones in those images are caused when the camera can't transfer the entire image to the storage device fast enough, so the camera has to toss away some of the data. If that's the case, then the data is gone. Now for some fun jargon! There's mbps and MB/s and they are two different things. mbps means megaBITS per second and MB/s mean megaBYTES per second. There are 8 bits in a byte, so the 28mbps recording option means that you need as SD card that writes at at least 3.5 MB/s. If you look at the chart below you will see the different types of SD card and their speed. Look at the SD card that was used to record those videos. If you see a "2" with a big C going around i, then the card you're using is too slow to write the entire video to.

    ClassMinimum performanceApplication
    SDHC Speed Class 2.svg Class 22 MB/sSD video recording
    SDHC Speed Class 4.svg Class 44 MB/sHigh-definition video (HD) recording including Full HD (from 720p to 1080p/1080i)
    SDHC Speed Class 6.svg Class 66 MB/s
    SDHC Speed Class 10.svg Class 1010 MB/sFull HD (1080p) video recording and consecutive recording of HD stills (high-speed data bus)
    UHS Class 1.png UHS Speed Class 1 (U1)10 MB/sReal-time broadcasts and large HD video files (UHS bus)
    UHS Class 3.png UHS Speed Class 3 (U3)30 MB/s4K video files (UHS bus)