I have posted a video on YouTube and it begins with many gray pixels (squares).

What can I do?

See this print-screen too:


  • 1
    The problem is in the video; I can see the gray pixels too, but it only appears @ 0:02.
    – amiregelz
    Aug 2, 2012 at 17:34
  • I don't think. On computer the gray pixels don't appear...
    – John
    Aug 2, 2012 at 17:53
  • @John, you are not watching the YouTube video on your computer, you are watching the original video. The one on YouTube is a converted copy of your video, and obviously something went wrong during the conversion. Try deleting the video and uploading (the original) again. If that still doesn’t work, try converting it on your own computer and uploading the converted version to YouTube.
    – Synetech
    Aug 2, 2012 at 17:55
  • I agree, @Synetech, but I am not sure if this is a problem of my video format (wmv) or is a youtube/flash player bug. PS: if you will post an answer, I will be happy to vote it. :)
    – John
    Aug 2, 2012 at 17:57

1 Answer 1


YouTube officially supports WMV files, and the Flash Player seems to work for most videos, so the video corruption is likely due to a bug during the conversion from your original WMV video to the MP4 that YouTube stores on its servers (it may even be as little as one corrupt frame).

You should try uploading the original again to see if conversion will work the second time.

If it does not, you can try converting the video to MP4 yourself. SUPER is a popular and easy-to-use program for this. The dimensions of the video should not matter, so you don’t have to worry about re-sizing or anything. Just convert it to MP4 yourself (which gives you greater control over the quality) and YouTube may not even convert the it at all.

They also have some tips for uploading videos that may help. If all else fails, you can use the Report a bug link at the bottom of the page or contact them about it (the contact page says AV sync issues, but the page that links to it does not: If you continue to experience Audio/Video issues with your upload, contact us and we may be able to help.)

  • I agree. Thank you for your answer. I think that I had the same problem a long time ago, but it was fixed automatic. Do you think that they keep the original video, and they can fix it without re-uploading? I uploaded it first as private video and watched it. No problems. I hope that they will fix it.
    – John
    Aug 2, 2012 at 18:18
  • I doubt that they keep the original; they probably only keep a high-quality MP4 version.
    – Synetech
    Aug 2, 2012 at 18:53
  • YouTube will always convert a video when you upload it, no matter what format.
    – slhck
    Aug 2, 2012 at 19:03
  • Then hopefully it will do a better job converting from H.264 or XviD than from WMV.
    – Synetech
    Aug 2, 2012 at 19:39

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