How did you manage to record the RTSP MP4 stream with HiDownload???

I thought that Mov Recorder is the only recorder of MOV and MP4 RTSP streams. However MP4 streams are more difficult to record (you may have seen some problems in this forum).

Two more programs to try are free VLC and MPlayer media players. Both can dump many streams and both are not very stable at it.

MP4 streams can be broadcasted by Apple's Darwin Server, however there are othere solutions (See, for example, MP4 streaming FAQ). So an MP4 stream is not necessarily a QuickTime stream.

You may also read about playing MP4 streams in the MP4 streaming FAQ

As for .MP4 files on a hard disk, I prefer to play them with free Media Player Classic that is a part of free "K-Lite Mega Codec Pack".
http://www.free-codecs.com/download/...Codec_Pack.htm

K-Lite Mega Codec Pack has MP4 splitter and a bunch of MPEG-4 decoders, as well as the majority of the most popular of codecs that are needed to play videos.

I suggest you to:
1. Download K-Lite Mega Codec Pack and try to play the videos.
2. Try MovRecorder to record video streams. It is free to try.