Two quite similar videos synced from iTunes store, one ok, other not

Hi all, my concern is regarding two synced videos from the iTunes University.
Programming paradigm (lect 1 for example): http://deimos3.apple.com/WebObjects/Core.woa/Browse/itunes.stanford.edu.16173481 11.01617348114.1607366371?i=2093660149
Programming methodology(lect 1 for example): http://deimos3.apple.com/WebObjects/Core.woa/Browse/itunes.stanford.edu.16153294 25.01615329428.1611703847?i=1348717488
The only differences between them are size bitrate and total bitrate.
- Both are:
MPEG-4 Video files (H.264)
320x240
- Programming paradigm (plays ok):
Size: 53.4 MB
Bit rate: 100 kbps
Total bit rate: 424 kbps
- Programming methodology (only audio plays, screen stays blank):
Size: 160.2 MB
Bit rate: 125 kbps
Total bit rate: 446 kbps
- Official iphone specs:
Baseline Profile with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4 and .mov file formats; H.264 video, up to 768 Kbps, 320 by 240 pixels, 30 frames per second.
_If we see the official iphone specs, then both the videos are within the playable range. But for some reason, the paradigms video plays well, while methodology one only plays sound but no video (blank screen)._
Can anyone guide me on why this is happening? and how to fix it?
PS: iPhone 3G
Message was edited by: Alaias

I had exactly the same problem. Would like to know if someone can solve it.
By the way, my iPod Touch could only play lecture 1 of the Programming Paradigm course. All the remaining lectures starting from lecture 2 have the same problem of only audio plays but no video.
Ｔｈｅｙ　ｃｏｕｌｄ　ｂｅ　ｐｌａｙｅｄ　ｃｏｒｒｅｃｔｌｙ　ｏｎ　ｉＴｕｎｅｓ　ｔｈｏｕｇｈ．

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