1. Open BSPlayer's preferences, go to file types and chech the box next to MP4 files. This way, BSPlayer wil be the default player for MP4 extension.
2. If some files play OK, some don't, then there is a codec missing on your system. Probably AVC one, and therefore BSPlayer can't play the video part of such files.
3. As far as I know, there isn't. Renaming them to MPA, the way they should be ?
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