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• ffmpeg creates empty flv files

  8 janvier 2012, par user1136924

  I'm trying to build avi to flv converter with c#. i'm using this code below (taken from here) but it produces empty flv files. please help figure this this out.

  on an button click the program takes the uploaded file from the upload box and creates a new flv file from it.

  thanks!

  protected void btn_Submit_Click(object sender, EventArgs e)
  {
      ReturnVideo(this.fileuploadImageVideo.FileName);
  }
  private bool ReturnVideo(string fileName)
  {
      string html = string.Empty;
      //rename if file already exists
  
      int j = 0;
      string AppPath;
      string inputPath;
      string outputPath;
      string imgpath;
      AppPath = Request.PhysicalApplicationPath;
      //Get the application path 
      inputPath = AppPath + "OriginalVideo";
      //Path of the original file 
      outputPath = AppPath + "ConvertVideo";
      //Path of the converted file 
      imgpath = AppPath + "Thumbs";
      //Path of the preview file 
      string filepath = Server.MapPath("~/OriginalVideo/" + fileName);
      while (File.Exists(filepath))
      {
          j = j + 1;
          int dotPos = fileName.LastIndexOf(".");
          string namewithoutext = fileName.Substring(0, dotPos);
          string ext = fileName.Substring(dotPos + 1);
          fileName = namewithoutext + j + "." + ext;
          filepath = Server.MapPath("~/OriginalVideo/" + fileName);
      }
      try
      {
          this.fileuploadImageVideo.SaveAs(filepath);
      }
      catch
      {
          return false;
      }
      string outPutFile;
      outPutFile = "~/OriginalVideo/" + fileName;
      int i = this.fileuploadImageVideo.PostedFile.ContentLength;
      System.IO.FileInfo a = new System.IO.FileInfo(Server.MapPath(outPutFile));
      while (a.Exists == false)
      {
  
      }
      long b = a.Length;
      while (i != b)
      {
  
      }
  
  
      string cmd = " -i \"" + inputPath + "\\" + fileName + "\" \"" + outputPath + "\\" + fileName.Remove(fileName.IndexOf(".")) + ".flv" + "\"";
      ConvertNow(cmd);
     string imgargs = " -i \"" + outputPath + "\\" + fileName.Remove(fileName.IndexOf(".")) + ".flv" + "\" -f image2 -ss 1 -vframes 1 -s 280x200 -an \"" + imgpath + "\\" + fileName.Remove(fileName.IndexOf(".")) + ".jpg" + "\"";
     ConvertNow(imgargs);
  
  
      return true;
  }
  private void ConvertNow(string cmd)
  {
      string exepath;
      string AppPath = Request.PhysicalApplicationPath;
      //Get the application path 
      exepath = AppPath + "ffmpeg.exe";
      System.Diagnostics.Process proc = new System.Diagnostics.Process();
      proc.StartInfo.FileName = exepath;
      //Path of exe that will be executed, only for "filebuffer" it will be "flvtool2.exe" 
      proc.StartInfo.Arguments = cmd;
      //The command which will be executed 
      proc.StartInfo.UseShellExecute = false;
      proc.StartInfo.CreateNoWindow = true;
      proc.StartInfo.RedirectStandardOutput = false;
      proc.Start();
  
      while (proc.HasExited == false)
      {
  
      }
  }
  

• playing ffmpeg in android

  8 janvier 2012, par John

  I am developing an android project in which i need to play ffmpeg format videos.I think android doesn't support ffmpeg formats.

  I have downloaded ffmpeg codec and loaded the library "libffmpeg.so" in my project using android ndk and JNI.

  Now,how can i use this "libffmpeg.so" to play those video formats.
  

  My project directory structure is like this.

  

  Any one please help.

• Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height

  7 janvier 2012, par Rocky Singh

  I am trying to convert an avi video file to flv format via FFMPEG with the following command:

  -i C:\files\input\test.avi -y -ab 448k -ar 48000 -vcodec mpeg4 -s 640x480 -f flv C:\files\output\test.flv
  

  Here is the response I am getting from ffmpeg:

  Input:

  Input #0, avi, from 'C:\files\input\test.avi':
    Metadata:
      encoder         : VirtualDubMod 1.5.10.2 (build 2540/release)
    Duration: 00:01:00.00, start: 0.000000, bitrate: 1813 kb/s
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 640x272 [SAR 1:1 DAR 40:17], 25 tbr, 25 tbn, 25 tbc
      Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), s16, 448 kb/s
  

  Output:

  Output #0, flv, to 'C:\files\output\test.flv':
    Metadata:
      encoder         : VirtualDubMod 1.5.10.2 (build 2540/release)
      Stream #0:0: Video: mpeg4, yuv420p, 640x480 [SAR 30:17 DAR 40:17], q=2-31, 200 kb/s, 90k tbn, 25 tbc
      Stream #0:1: Audio: mp3, 48000 Hz, 5.1(side), s16, 448 kb/s
  Stream mapping:
    Stream #0:0 -> #0:0 (mpeg4 -> mpeg4)
    Stream #0:1 -> #0:1 (ac3 -> libmp3lame)
  Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height
  

  Can you tell me what is MAY BE here? and what is wrong above?

• Converting videos to flv using ffmpeg

  6 janvier 2012, par user703526

  In my c# application, i am writing code for converting any video format to flv format. For this FFMPEG is used.

  Some times an exceptions is occuring like:

  Attempted to read or write protected memory. This is often an indication that other memory is corrupt

  Below is my code from where the exception throwing,

      IntPtr pFormatContext;
      FFmpeg.av_register_all();
  
      int ret;
      ret = FFmpeg.av_open_input_file(out pFormatContext, this.Filename, IntPtr.Zero, 0, IntPtr.Zero);
  
      if (ret < 0)
      {
          Trace.WriteLine("couldn't open input file");
  
          FFmpeg.av_free_static();
          return;
      }
  
  
      try
      {
          ret = FFmpeg.av_find_stream_info(pFormatContext);
  
          if (ret < 0)
          {
              Trace.WriteLine("couldnt find stream informaion");
              FFmpeg.av_close_input_file(pFormatContext);
              FFmpeg.av_free_static();
              return;
          }
  
  
          FFmpeg.AVFormatContext formatContext = (FFmpeg.AVFormatContext)Marshal.PtrToStructure(pFormatContext, typeof(FFmpeg.AVFormatContext));
  
          Duration = formatContext.duration / FFmpeg.AV_TIME_BASE;
  
          for (int i = 0; i < formatContext.nb_streams; ++i)
          {
              FFmpeg.AVStream stream = (FFmpeg.AVStream)Marshal.PtrToStructure(formatContext.streams[i], typeof(FFmpeg.AVStream));
              FFmpeg.AVCodecContext codec = (FFmpeg.AVCodecContext)Marshal.PtrToStructure(stream.codec, typeof(FFmpeg.AVCodecContext));
  
              if (codec.codec_type == FFmpeg.CodecType.CODEC_TYPE_VIDEO)
              {
                  Height = codec.height;
                  Width = codec.width;
  
                          Type = FileType.flv;
                          MimeType = "video/x-flv";
  
              }
  
          }
      }
      catch (Exception ex)
      {
          Trace.WriteLine("FFMpeg failed to understand the file");
      }
  
      FFmpeg.av_close_input_file(pFormatContext);
      FFmpeg.av_free_static();
  }
  

  And from the above code this ret = FFmpeg.av_find_stream_info(pFormatContext); line throws memory corrupt exception. Please help me to solve this issue.

• FFmpeg vs Libav ?

  6 janvier 2012, par Shimmy

  I just realized that Libav is a fork of FFmpeg.

  I'm now about to develop a media program that will have to involve the use of such a tool. Should I stick to FFmpeg? Are there any significant features in Libav downbeating FFmpeg?

  What considerations do you recommend?