AVStream *st;
static int flv_read_header(AVFormatContext *s,                           AVFormatParameters *ap){    int offset, flags;    AVStream *st;        s->ctx_flags |= AVFMTCTX_NOHEADER; //ok we have a header but theres no fps, codec type, sample_rate, ...    url_fskip(&s->pb, 4);    flags = get_byte(&s->pb);    offset = get_be32(&s->pb);    url_fseek(&s->pb, offset, SEEK_SET);    return 0;}