Two usb webcams with YUYV format on one usb hub
I'm trying to launch two cams from VLC, guvcwiev and all I get is error. I think this is why - http://superuser.com/questions/431759/u … s-in-linux
"If the only pixel format returned is "YUYV", "IUYV", "I420", or "GBRG" you'll only be able to run one camera per USB controller* since those formats are uncompressed. Using multiple webcams which support MJPEG or some other form of compression will work fine.
*Unless you're happy with 320x240 resolution or lower."
Question is
I think I will be happy with two cams running 320*240 resolution. How can I change their resolution and launch them?
I've tried change it in guvcview but getting same error. On two different hubs it runs okay.
Here's lsusb and v4l2-ctl -d /dev/video2 --list-formats
lsusb
Bus 002 Device 007: ID 1871:0101 Aveo Technology Corp. UVC camera (Bresser microscope)
Bus 002 Device 006: ID 1871:0101 Aveo Technology Corp. UVC camera (Bresser microscope)
v4l2-ctl -d /dev/video2 --list-formats
ioctl: VIDIOC_ENUM_FMT
Index : 0
Type : Video Capture
Pixel Format: 'YUYV'
Name : YUV 4:2:2 (YUYV)
Last edited by imm_yohan (2014-06-05 12:27:31)
yes, altho my problem is not exactly the same, i too am having a hard time configuring my 2 USB webcams (Logitech 905s) in 10.6.4! i use Camtwist but i can't even get the cameras to produce an image!
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I have been looking around on this and can not find a specific answer.
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import java.io.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.sql.*;
// chart and pdf out
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.xy.*;
import org.jfree.data.xy.XYBarDataset;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.statistics.SimpleHistogramDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.DefaultFontMapper;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfTemplate;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.text.*;
import com.lowagie.text.pdf.*;
import com.lowagie.text.pdf.PdfPCell;
public class report_gen extends HttpServlet
private final String titles[] = {"Top Five popular movies ",
"Financial cirumstance of cinemas",
"Distribution of time segment",
"Distribution of favourite movie type"
private final String descs[] = {"This report is to show the top five popular movies in cinemix for a period ",
"This report is to show the financial circumstance of each cinema site ",
"This report is to analysis the customer when is the most visit time ",
"This report is to analysis the customer which type of movie do they watch the most"
private final String bigTitle = "Cinemix";
private final String driver = "org.gjt.mm.mysql.Driver";
private final String url= "jdbc:mysql://localhost:3306/cinemix";
private final String userID = "abc";
private final String passwd = "abc";
public void init(ServletConfig config) throws ServletException
super.init(config);
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
final int width = 550;
final int height = 200;
/ title font (centre and report title)
final Font fTitle0 = FontFactory.getFont("Helvetica", 42, Font.BOLD);
final Font fTitle1 = FontFactory.getFont("Helvetica", 30, Font.BOLD);
// centre name:
final String title0 = bigTitle;
// Default category for DefaultCategoryDataset
final String cat = "data";
Connection conn;
JFreeChart chart;
String title1 = "xyz Report";
String chartDesc = "description";
String notes[] = new String[4];
String chartTitle = "so bad this is title";
String chartXTitle = "this is x";
String chartYTitle = "this is y.";
String report = request.getParameter("report");
int max=-10000;
int min=10000;
int j=0;
// do some basic checking
if (report == null || report.equals(""))
report = "-1"; // this course unknow report error message
String start = request.getParameter("start");
String end = request.getParameter("end");
String order_by = request.getParameter("order_by"); // ToDo: check invalid string
int topN = 5;
String order = (order_by.equals("desc")) ? "Top" : "Last";
String inv[] = {"08:30", "09:30", "10:30", "11:30", "12:30", "11:30", "12:30", "13:30", "14:30", "15:30", "16:30", "17:30","18:30","19:30","20:30","21:30","22:30","23:30"};
int inv_val[] = new int[inv.length - 1];
try
Class.forName(driver).newInstance();
catch(Exception e)
printE("Cannot load mysql database driver!", response);
e.printStackTrace();
return;
try
conn = DriverManager.getConnection(url, userID, passwd);
if (report.equals("r1")) { // report 1
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
Statement stmt = conn.createStatement();
String sql = "select *,count(f.Name),f.Name from film f, filmDetail fd, ticket t where f.startDate > '" + start + "' and f.endDate < '" + end + "'and fd.filmID = f.filmID and fd.filmDetailID = t.filmDetailID group by f.name order by fd.filmDetailID asc limit '" +topN+"'";
ResultSet rs = stmt.executeQuery(sql);
while (rs.next())
if (rs.getInt("fd.filmDetailID") > max) max = rs.getInt("fd.filmDetailID");
if (rs.getInt("fd.filmDetailID") < min) min = rs.getInt("fd.filmDetailID");
j++;
ataset.setValue(rs.getInt("fd.filmDetailID"), cat,rs.getString("f.Name"));
title1 = titles[0];
chartDesc = descs[0];
chartTitle = order + " " + topN + " popular movie";
chartYTitle = "Box Office record";
chartXTitle = "Film Name";
gender = " ";
chart = ChartFactory.createBarChart(chartTitle, chartXTitle, chartYTitle, dataset,PlotOrientation.VERTICAL, false, true, false);
else
print("Error: I don't inderstand your request!", response);
return;
catch (SQLException e)
printE("Cannot open database connection? <br>", response);
// printE(e.toString);
e.printStackTrace();
return;
response.setContentType("application/pdf");
Document document = new Document(PageSize.A4, 5, 5, 5, 5);
try
PdfWriter writer;
writer = PdfWriter.getInstance(document, response.getOutputStream());
HeaderFooter footer = new HeaderFooter(new Phrase("Page: "), true);
footer.setBorder(Rectangle.NO_BORDER);
document.setFooter(footer);
footer.setAlignment(Element.ALIGN_CENTER);
// step 3
document.open();
document.add(getHeader(title0, title1, start, end, gender, order, topN, chartDesc));
document.add(printChart(chart, writer));
document.add(getFooter(notes));
catch(DocumentException de)
de.printStackTrace();
// step 5
document.close();
return;
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/** Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
// processRequest(request, response);
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/* To print en error and exit(?) */
private void printE(Object obj, HttpServletResponse response) throws IOException
response.setContentType("text/html");
PrintWriter out;
out = response.getWriter();
out.print(obj.toString());
out.close();
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Font fTitle3 = FontFactory.getFont("Helvetica", 12, Font.BOLD);
Font fValue = FontFactory.getFont("Helvetica", 12, Font.UNDERLINE);
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parStartEnd.add(new Phrase("Data start from: ", fTitle3));
parStartEnd.add(new Phrase(start, fValue));
parStartEnd.add(new Phrase(" to ", fTitle3));
parStartEnd.add(new Phrase(end, fValue));
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parGender.add(new Phrase(sex, fValue));
Paragraph parTopN = new Paragraph();
parTopN.add(new Phrase("Now is showing ", fTitle3));
parTopN.add(new Phrase(order, fValue));
parTopN.add(new Phrase(" ", fValue));
parTopN.add(new Phrase(new Integer(topN).toString(), fValue));
parTopN.add(new Phrase(" record(s)", fTitle3));
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PdfPTable tblMain = new PdfPTable(1);
tblMain.getDefaultCell().setBorder(0);
// Print title
tblMain.getDefaultCell().setHorizontalAlignment(Element.ALIGN_CENTER);
tblMain.addCell(new Paragraph(title0, fTitle0));
tblMain.addCell(new Paragraph(title1, fTitle1));
tblMain.addCell("");
tblMain.addCell("");
tblMain.addCell("");
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//tblMain.addCell("");
tblMain.getDefaultCell().setHorizontalAlignment(Element.ALIGN_LEFT);
tblMain.addCell(parStartEnd);
tblMain.addCell("");
tblMain.addCell(parGenerateDate);
tblMain.addCell("");
if (sex != " ")
tblMain.addCell(parGender);
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tblMain.addCell(" \n");
tblMain.addCell("");
tblMain.setWidthPercentage(96);
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tblMain.addCell("\n");
// Finish main table
return tblMain;
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PdfContentByte cb = writer.getDirectContent();
int width = 550;
int height = 450;
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Graphics2D g2d = tp.createGraphics(width, height, new DefaultFontMapper());
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g2d.dispose();
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tblDownDown.addCell(" \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n");
tblDownDown.addCell(" \n \n \n \n \n \n");
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Font fComment = FontFactory.getFont("Helvetica", 12, Font.ITALIC);
Font fTitle1 = FontFactory.getFont("Helvetica", 30, Font.ITALIC);
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tblFooter.addCell("");
tblFooter.addCell("");
tblFooter.getDefaultCell().setHorizontalAlignment(Element.ALIGN_LEFT);
for (int i=0;i<notes.length;i++)
if (notes[i] != null)
tblFooter.addCell(new Paragraph("" + (i+1) + ". " + notes[i] + "", fComment));
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tblFooter.addCell("");
tblFooter.getDefaultCell().setHorizontalAlignment(Element.ALIGN_CENTER);
tblFooter.addCell(new Paragraph("- End of report -", fComment));
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