I too have to admit I had never heard of the LAV format before -- though a quick Google search reveals that there is a lot of info about it. However, after a quick perusal, I still remain unclear about it. But it does seem clear that you will certainly need the codec installed on your computer to play it properly. It also appears from at least one source that, as of July this year, LAV's audio aspects still needed some testing as there had been some problems with earlier versions: see
http://codecs.forumotion.net/t715-lav-v ... -questions
It is also worth noting that it is not a format supported by Video Studio. The following is from the VS X5 Tech Specs on Corel.com:
Input Formats Supported:
. Video: AVI, MPEG-1, MPEG-2, AVCHD™, MPEG-4, H.264, BDMV, DV, HDV™, DivX®, QuickTime®, RealVideo®, Windows Media® Format, MOD (JVC® MOD File Format), M2TS, M2T, TOD, 3GPP, 3GPP2
The frame format size (1024 x 576) also is not a standard format. It could be from a screen capture or some other specialised device. Can you give details, please.
Can you also check in X5's Settings > Preferences > Edit, and check under the Audio heading that the box beside "Apply audio cross-fade automatically" is ticked...