Quicktime 7.7.4 will not play mp4 video

I have several recorded videos saved in mp4 format that will not open in Quicktime. The audio plays, but the video is only a black screen. I have one mp4 file that I recorded a few days before the others that will open in Quicktime. All the files open in VLC, DivX, Adobe Premiere Pro 5.5, and Windows Media Player. I am using Windows 7 and I need to import these videos into Photoshop CS5.5 extended which it will not do if the files won't play in Quicktime. I've tried just about everything including re-recording, but my recording will only save in mp4 or flv. I have also uninstalled and re-installed quicktime, photoshop, and my recording device.
The first two images are from files that will not play in Quicktime, no picture only sound. That last image is from a file which will play; both sound and picture.
Your video data rates are virtually nonexistent. (I.e., a "normal" quality AAC stereo track for a video file is typically recorded with a sampling rate in the 44.1 KHz at 128 Kbps to 48 KHz at 160 Kbps range.) As you can see in the inspector images the total audio plus video data rate allocated for your files are all little more than that required to support a "normal" stereo audio track. Recompress the files using a more realistic video data rate. Try something in 1.25 Mbps to 2.50 Mbps range as a starting point and determine the minimum level of quality you can live with here. (I.e., a typical VGA SD iPod file is normally compressed with a video data rate on the order of 1.5 Mbps to 1.7 Mbps.)

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Message was edited by: magneticjak
Message was edited by: magneticjak

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