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• AVCodecContext::channel_layout 0 for WAV files

  30 décembre 2013, par cmannett85

  I have been successfully loading compressed audio files using FFmpeg and querying their channel_layouts using some code I've written :

  AVFormatContext* fmtCxt = nullptr;
  
  avformat_open_input( &fmtCxt, "###/440_sine.wav", nullptr, nullptr );
  
  avformat_find_stream_info( fmtCxt, nullptr );
  
  av_find_best_stream( fmtCxt, AVMEDIA_TYPE_AUDIO, -1, -1, nullptr, 0 );
  
  
  
  AVCodecContext* codecCxt = fmtCxt->streams[ret]->codec;
  
  AVCodec* codec = avcodec_find_decoder( codecCxt->codec_id );
  
  avcodec_open2( codecCxt, codec, nullptr );
  
  
  
  std::cout << "Channel Layout: " << codecCxt->channel_layout << std::endl;
  
  av_dump_format( fmtCxt, 0, "###/440_sine.wav", 0 );

  I've removed all error checking for brevity. However for Microsoft WAV files (mono or stereo) the AVCodecContext::channel_layout member is always 0 - despite ffprobe and av_dump_format(..) both returning valid information :

  Input #0, wav, from '###/440_sine.wav':
  
  Duration: 00:00:00.01, bitrate: 740 kb/s
  
  Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 1 channels, s16, 705 kb/s

  Also codecCxt->channels returns the correct value. Using a flac file (with exactly the same audio data generated from the same application), gives a channel_layout of 0x4 (AV_CH_FRONT_CENTER).

• Problem compiling ffmpeg with nvenc using visual studio 2015 community edition

  23 février 2020, par Uri Raz

  I’m trying to build ffmpeg w/ nvenc on Windows 10 64 bit and visual studio 2015 community edition. The command from step 10 in the Using FFmpeg with NVIDIA GPU Hardware Acceleration doc :

  ./configure —enable-nonfree —enable-cuda-sdk —enable-libnpp –-toolchain=msvc —extra-cflags=-I../nv_sdk —extraldflags=-libpath :../nv_sdk

  Gives me the error ’Unknown option "–-toolchain=msvc"’

  Background : I’ve executed the commands (changed the path in the first, I’m not sure its right) :

  export PATH="/C/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.16.27023/bin/Hostx64/x64/" :$PATH
  export PATH="/c/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v10.0/bin/" :$PATH

  And ../nv_sdk has the subdirectories include & bin, copied from the NVIDIA GPU Computing Toolkit directory.

• VB.Net Stream Bitmap/Image TO FFMpeg is not working :(

  6 février 2015, par Zakir_SZH

  I m trying to port images to FFMpeg using StandardInput. It’s not working somehow ? :(

  it’s throwing me bellow error :(

  

  Here is the code i tried :

      Dim objBitmap As System.Drawing.Bitmap
  
      Dim objFProcess As System.Diagnostics.Process
  
      Dim objStream As System.IO.BinaryWriter
  
      Dim strFiles() As String
  
      Dim strEachFile As String
  
      Dim intFile As Integer
  
      Dim intFrame As Integer
  
      Dim intFLoop As Integer
  
      objFProcess = New System.Diagnostics.Process
  
      objFProcess.StartInfo.FileName = "c:\ffmpeg.exe"
  
      objFProcess.StartInfo.Arguments = "-r 1 -f image2pipe -i pipe:.bmp -pix_fmt yuv420p -crf 35.0 -vcodec libx264 -an -coder 1 -rc_lookahead 50 -threads 0 D:\test.mp4"
  
      objFProcess.StartInfo.UseShellExecute = False
  
      objFProcess.StartInfo.RedirectStandardInput = True
  
      objFProcess.StartInfo.RedirectStandardOutput = True
  
      objFProcess.StartInfo.RedirectStandardError = True
  
      rem objFProcess.StartInfo.WindowStyle = ProcessWindowStyle.Hidden
  
      rem objFProcess.StartInfo.CreateNoWindow = True
  
      objFProcess.Start()
  
      objStream = New System.IO.BinaryWriter(objFProcess.StandardInput.BaseStream)
  
      strFiles = My.Computer.Clipboard.GetText().Split({System.Environment.NewLine}, StringSplitOptions.None)
  
      intFrame = 0
  
      intFile = 0
  
      For Each strEachFile In strFiles
  
          rem MessageBox.Show(strEachFile)
  
          intFile = intFile + 1
  
          objBitmap = New System.Drawing.Bitmap(strEachFile)
  
          For intFLoop = 0 To 24
  
              intFrame = intFrame + 1
  
              cmd1.Text = intFile.ToString & "-" & intFrame.ToString
  
              My.Application.DoEvents()
  
              objBitmap.Save(objStream.BaseStream, System.Drawing.Imaging.ImageFormat.Bmp) Rem this line give me above (attached) error :(
  
          Next
  
          objBitmap.Dispose()
  
      Next
  
      System.Threading.Thread.Sleep(3000)
  
      objStream.Close()
  
      MessageBox.Show("Done!")
  
      rem objFProcess.Kill()

  any help would be highly appreciated

  thanks in advance...

  Edit-1 :
  As asked by some one :) here is :

  View Detail Result : (Sorry, the image is very large in width/height)

  

  And here is the Copy Details Result :

  System.Runtime.InteropServices.ExternalException was unhandled
  
  ErrorCode=-2147467259
  
  Message=A generic error occurred in GDI+.
  
  Source=System.Drawing
  
  StackTrace:
  
     at System.Drawing.Image.Save(Stream stream, ImageCodecInfo encoder, EncoderParameters encoderParams)
  
     at System.Drawing.Image.Save(Stream stream, ImageFormat format)
  
     at FFMpeg_Stream.Form1.cmd1_Click(Object sender, EventArgs e) in g:\My Documents\FFMpeg Stream\FFMpeg Stream\Form1.vb:line 40
  
     at System.Windows.Forms.Control.OnClick(EventArgs e)
  
     at System.Windows.Forms.Button.OnClick(EventArgs e)
  
     at System.Windows.Forms.Button.WndProc(Message& m)
  
     at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
  
     at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
  
     at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
  
     at System.Windows.Forms.UnsafeNativeMethods.SendMessage(HandleRef hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
  
     at System.Windows.Forms.Control.SendMessage(Int32 msg, IntPtr wparam, IntPtr lparam)
  
     at System.Windows.Forms.Control.ReflectMessageInternal(IntPtr hWnd, Message& m)
  
     at System.Windows.Forms.Control.WmCommand(Message& m)
  
     at System.Windows.Forms.Control.WndProc(Message& m)
  
     at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
  
     at System.Windows.Forms.Form.WndProc(Message& m)
  
     at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
  
     at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
  
     at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
  
     at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
  
     at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
  
     at System.Windows.Forms.Control.DefWndProc(Message& m)
  
     at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
  
     at System.Windows.Forms.Control.WndProc(Message& m)
  
     at System.Windows.Forms.ButtonBase.WndProc(Message& m)
  
     at System.Windows.Forms.Button.WndProc(Message& m)
  
     at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
  
     at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
  
     at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
  
     at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
  
     at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
  
     at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
  
     at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
  
     at System.Windows.Forms.Application.Run(ApplicationContext context)
  
     at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
  
     at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
  
     at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
  
     at FFMpeg_Stream.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
  
     at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
  
     at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
  
     at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
  
     at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
  
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
  
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
  
     at System.Threading.ThreadHelper.ThreadStart()
  
  InnerException:

  that’s all i can give as information :(