The VideoLAN Forums

I would like to know where to look in vlc source code to understand if a stream is scrambled and descrambling works fine.
thanks

Scambled or interlaced?

Scrambled.

like in TS-CSA?

yes.some tv channels switch between scrambled and open(not scrambled)streams.i need to discover this transition and then need to detect if my system(ci module+official subscription card) works fine for the scrambled stream.

So, this is done at the TS demuxer level. See modules/demux/ts.c