DrawTextFilter.java

    public String toArgument(){
        StringBuilder filterParam = new StringBuilder();
        //To make old code work
        DrawTextFilter overlay=this;

        filterParam.append("drawtext=fontfile='");
        filterParam.append(overlay.getFont());
        filterParam.append("':text='");
        filterParam.append(overlay.getText());
        filterParam.append("':x=(W/2)-(w)/2:y=5:draw='gt(t,");
        filterParam.append(timeStringToSeconds(overlay.getStartTime()));
        filterParam.append(")*lt(t,");
        filterParam.append(timeStringToSeconds(overlay.getEndTime()));
        filterParam.append(")':fontsize=");
        filterParam.append(overlay.getTextSize());
        filterParam.append(":fontcolor=");
        filterParam.append(overlay.getColour());

        return filterParam.toString();
    }