No video, only audio with MP4

I downloaded an MP4 file for a class assignment and only the audio plays from the file - no video. Other MP4 files work fine for me, and I have checked with my peers who have also used this class video who claim they had no problem with it. I am running the most updated version of Quicktime on OSX Lion. Any thoughts on what could be wrong here?

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For work in CS6, your .mp4 files stil have all the frames, it's just the playback that is not full frame rate. One possible workaround to the playback is to place your files in a TImeline Sequence, add an Adjustment layer in trck above and then add a Brightness & Contrast effect to the Adjustment layer, with both values set to zero (basically, file is unaffected but requires rendring). Render Effects in Work Area and now you should have full frame rate playback.
If you want to convert the files, you could try exporting them to H.264 within Premiere or AME. There will be some generational loss, so you could try a sample export to see if the quality is acceptable to you. You could try Format: H.264, 1920x1080, Frame Rate: 50, Profile: High, Level:4.2, Bitrate Encoding: VBR 1 pass, Target Bitrate [Mbps]: 35, enable 'Use Maximum Render Quaility'. These settings closely match the attributes of your supplied file.
And I think you already realize this, but if you continue to stay with CS6, then I would recommend that you record AVCHD.
I hope this helps.

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I downloaded Perian again
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There seems to be an issue with the version of Quicktime X (10.1) in Lion and Perian version 1.2.3.
The are several options in terms of other media players (VLC, MPlayerX, RealPlayer [ugh…], and others…) that will handle FLV files with ease. Alternatively, you could run your video files through an encoder (HandBrake, MPEG Streamclip, SmartConverter, etc.) converting the files into something QuickTime naturally understands like an MP4 or MOV.
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Get it here: http://perian.cachefly.net/Perian_1.2.2.dmg , or here:http://www.videohelp.com/download/Perian_1.2.2.dmg
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Try testing one of the FLVs in QuickTime or QuickLook and with a bit of luck, radio becomes TV.
Oh… and on the off chance it doesn't work and you want to watch some FLVs? Use VLC (http://www.videolan.org), or convert them with HandBrake (http://handbrake.fr).
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Sources:
http://www.videohelp.com/tools/Perian/old-versions#download
http://forums.cocoaforge.com/viewtopic.php?f=25&t=23541&start=20
http://fairerplatform.com/2011/04/vlc-player-1-1-9-perian-1-2-2-updates-ship/

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Have you tried loading Perian (www.perian.org)? That will provide you with many additional CODECs which SHOULD solve the problem...

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First post here, and I apologize if this has been somewhat covered in other posts, I couldn't seem to find any similar issues in this matter, and I pray someone here can help.
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