It works really well for me even when FLV files use video codecs other than MPEG-4 AVC (h.264).

I use freeware tcpmp on my Windows Mobile cell phone. It doesn't play some FLV files, but after remuxing them into MKV I can play the files without any problem. No need to spend $40 onto CorePlayer

Initially I was using RMC to remux into MP4, but I had some problems with On VPx video codecs. MKV container seems to be better. No wonder it is supported by more and more hardware players.

I must admit, that I could play most of the videos online, but I prefer to increase the playback speed.

Sorry for off topic.