@Chikuzen, Thanx, Have D/L'ed, will try. Always nice to have an alternative. Find link below to Adobe FlvCheck v1.0 (Req vs6 c++ redistributable) Cannot source a later version, but does exist. Also incl, brief instructions to fix a bad FLV file. Many FLV files (including On2 produced) are considered bad by Adobe FlvCheck, FlvCheck is supposed to fix them but sometimes flags an error. Instructions tell how to fix these errors (usually) and then retry with FlvCheck. This actually does work unlike many fixes you might have seen. Required:- FFMpeg.Exe EDIT:- The linked FLVCheck shows itself to be v1.0, however, there are multiple v1.0 FlvCheck's around, seems Adobe did not update version number. This FlvCheck is freely downloadable from Adobe, however, you cannnot find it with an Adobe search, brings up stuff about Adobe FLV Server (with which it is included) but the earlier version is well hidden. I found it via a link from some other site, dont any longer have that link.