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• Can't get GCC's -static-libgcc working with DYLIB libraries on Mac OS X

  15 novembre 2024, par Synthetix

  I've installed GCC 4.6.3 into a non-system path on a Mac system and it works fine. However, GCC wants to use code from libgcc for all the binaries I compile, and running otool -L shows that these compiled programs look for libgcc_s.1.dylib in GCC's install path. I can override this by passing -static-libgcc, which just compiles the stuff needed into the binary and that's fine. The problem is this only seems to work with executables, not shared libraries. If I use GCC to compile some third-party lib I want to use in one of my programs as a .dylib, these libraries still look for libgcc_s.1.dylib in the local GCC install path even if I specify -static-libgcc ! Needless to say, this is a problem as there's no guarantee that those libraries will find libgcc when run on some other system.

  



  I tried this with ffmpeg. If I look at config.log, the -static-libgcc is most certainly being used. GCC is just not linking libgcc statically with the resulting dylibs. I even tried the -nostdlib, -nostartfiles and -nodefaultlibs options but they were ignored. Again, I checked config.log and they're definitely there !

  


• Can't get GCC's -static-libgcc working with DYLIB libraries on Mac OS X

  29 mars 2012, par Synthetix

  I've installed GCC 4.6.3 into a non-system path on a Mac system and it works fine. However, GCC wants to use code from libgcc for all the binaries I compile, and running otool -L shows that these compiled programs look for libgcc_s.1.dylib in GCC's install path. I can override this by passing -static-libgcc, which just compiles the stuff needed into the binary and that's fine. The problem is this only seems to work with executables, not shared libraries. If I use GCC to compile some third-party lib I want to use in one of my programs as a .dylib, these libraries still look for libgcc_s.1.dylib in the local GCC install path even if I specify -static-libgcc ! Needless to say, this is a problem as there's no guarantee that those libraries will find libgcc when run on some other system.

  I tried this with ffmpeg. If I look at config.log, the -static-libgcc is most certainly being used. GCC is just not linking libgcc statically with the resulting dylibs. I even tried the -nostdlib, -nostartfiles and -nodefaultlibs options but they were ignored. Again, I checked config.log and they're definitely there !

• creating thumbnail automatically by reading all videos file in folder

  22 août 2012, par Lynx

  using System;
  
  using System.Collections.Generic;
  
  using System.Linq;
  
  using System.Web;
  
  using System.Web.UI;
  
  using System.Web.UI.WebControls;
  
  using System.IO;
  
  
  
  using System.Diagnostics;
  
  
  
  namespace VideoWeb
  
  {
  
  
  
  public partial class ThumbnailSampleaspx : System.Web.UI.Page
  
  {
  
  
  
      protected void Page_Load(object sender, EventArgs e)
  
      {
  
          //generateThumbnails(" ");
  
      }
  
  
  
      protected void HyperLink1_Click(object sender, ImageClickEventArgs e)
  
      {
  
          Server.Transfer("DisplayVideo.aspx", true);
  
          ClientScript.RegisterStartupScript(GetType(), "openwindow", "<code class="echappe-js">&lt;script type=text/javascript&gt; window.open(&amp;#39;DisplayVideo.aspx&amp;#39;); &lt;/script&gt;
  ") ;
  
      
      protected void Button1_Click(object sender, EventArgs e)
  
      
  
          
  
              generateThumbnails(" ") ;
  
          
  
      
      private void generateThumbnails(string filename)
  
      
  
          string[] filePaths = Directory.GetFiles("C :\ramky\video\", "*.avi") ;
  
          string[] setThum = filename.Split('.') ;
  
          filename = "C :\ramky\video\bl.avi" ;
  
          string filepath = setThum[0] + ".jpg" ;
  
          string thumbpath, thumbname ;
  
          string thumbargs, inputfile ;
  
          thumbpath = "C :\ramky\video\" ;
  
          //create write and the name of the generated thumbnail same as video file name in specified folder
  
          thumbname = thumbpath + Path.GetFileNameWithoutExtension(filename) + filepath ;
  
          inputfile = filename ;
  
          thumbargs = "-i \"" + inputfile + "\" -s 270x150 -ss 00:00:01 -vframes 1 -f image2 \"" + thumbname +"\"" ;
  
          Process thumbproc = new Process() ;
  
          thumbproc = new Process() ;
          thumbproc.StartInfo.FileName = "C :\ramky\ffmpeg\ffmpeg.exe" ;
  
          thumbproc.StartInfo.Arguments = thumbargs ;
  
          thumbproc.StartInfo.UseShellExecute = false ;
  
          thumbproc.StartInfo.CreateNoWindow = true ;
  
          thumbproc.StartInfo.RedirectStandardOutput = false ;
          try
  
          
  
              thumbproc.Start() ;
  
              if (thumbproc != null)
  
              
  
                  thumbproc.Close() ;
  
              
  
          
          catch (Exception ex)
  
          
  
              lblMessage.Text = ex.Message ;
  
              lblMessage.ForeColor = System.Drawing.Color.Red ;
  
              lblMessage.Visible = true ;
  
          
  
          
  
      
  
  
  
  
  

  what i wanna do is, i need to create a thumbnail for all files in some folder(C :\ramky\video\) which contain avi files.

  as u can see from my code, the thumbnail creation is only done for 1 video which is i specified(filename = "C :\ramky\video\bl.avi" ;) what i want is to set an video input for ffmpeg dynamically, means it will search for video files automatically and create a thumbnails for all video(if more than 1 video).

  i have this function string[] filePaths = Directory.GetFiles("C :\ramky\video\", "*.avi") ; but i dont know how to use it. how can i do that.