rtp_c->first_pts = AV_NOPTS_VALUE;
static void rtsp_cmd_pause(HTTPContext *c, const char *url, RTSPHeader *h){    HTTPContext *rtp_c;    rtp_c = find_rtp_session_with_url(url, h->session_id);    if (!rtp_c) {        rtsp_reply_error(c, RTSP_STATUS_SESSION);        return;    }        if (rtp_c->state != HTTPSTATE_SEND_DATA &&        rtp_c->state != HTTPSTATE_WAIT_FEED) {        rtsp_reply_error(c, RTSP_STATUS_STATE);        return;    }        rtp_c->state = HTTPSTATE_READY;        /* now everything is OK, so we can send the connection parameters */    rtsp_reply_header(c, RTSP_STATUS_OK);    /* session ID */    url_fprintf(c->pb, "Session: %s\r\n", rtp_c->session_id);    url_fprintf(c->pb, "\r\n");}