H264 and extra wide video

I think I may have found either a bug or limitation with the H.264 codec. I am working with files that are 5760x1080. When I compress these using h.264, the colors get corrupted. Using 1920x1080, or 3840x1080, everything is fine.
Is this a known limitation? What other codec should I consider that will give me equivalent performance to h.264 without this limitation?

Just did a test at 5760x1080. Things looked messed up. Have no idea why.

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    After upgrading to Firexfox 35.0 all vine videos, instagram videos and some webplayer videos dont work anymore.
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    http://i.imgur.com/5OaxOFC.jpg
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    http://i.imgur.com/cqRpJOp.jpg
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    http://bestanimes.tv/mushishi-zoku-shou-2nd-season-episode-10/
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    http://i.imgur.com/9fCZ1s2.jpg
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    http://i.imgur.com/gCaUMXm.jpg
    http://i.imgur.com/V9w7ulS.jpg
    http://www.jwplayer.com/
    http://i.imgur.com/dqZtoTX.jpg
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    http://i.imgur.com/uWWKelX.jpg
    http://i.imgur.com/HYBjwdZ.jpg
    http://i.imgur.com/IK4C2WR.jpg
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    When I try to toggle it to something else I dont even get the option to use Shockwave Flash
    http://i.imgur.com/gTH18S1.jpg
    In Conclusion, what gives??
    -In 34.0 Everything worked.
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    -The reason for all of this not working is the type of video extension they have. Judging from the examples I gave of the things I cant play, it would seem I cant play mp4, flv and whatever vine uses. Which I think its mp4 as well.
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