To all the respect to the work done by BSPeter, Neither AviCodec, Video Inspector nor Gspot can't hadle properly MP4 files. But I am sure I can play them. I do have many files that Gspot say it can be rendered, but fails to render them. BSPlayer play them OK instead.
There are 99 % chances that the MP4 file we talk about have AAC audio. 3ivX can handle it properly. I am not sure AC3Filter can do that.
So, if you don't like 3ivX you can install CoreAAC decoder.
EDIT: You should try MP4UI to analise MP4 files.
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