I get cranky, too, with all this MP4 crap. It's just a buzzword that ignoramuses use to mean "Video Player". It wouldn't be so bad if there wasn't an actual video format called "MP4", which there shouldn't be, because it's too similar to MP3. And it's a crap format anyway.
Most of these players from China use Rockchip, which understands XviD, but they are very finicky about the exact format. The picture size has to be EXACTLY whatever the native screen size is, and given a black matte top and bottom if it is a widescreen format. The audio must be MP2, nothing else. Video frame rate must be an integer between 15 and 22. Some work, some don't.
For anybody who doesn't know, viDrop is the definitive answer to making videos that play on these little machines. None of the other converters give you any control over the result.
-freddy
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