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• Ignore streams when finding stream info

  17 mars 2018, par CSNewman

  I’m trying to speed up the start of ffmpeg when processing my live stream, and have narrowed down the issue to the ‘avformat_find_stream_info’ function. The source I’m trying to process seems to have a number of streams that ffmpeg is unable to determine what they are and therefore spends a while trying to find information about them (The entire analyse window). I know ahead of time that I only want to find information about stream #0:0 and #0:1, and I will be disregarding the other streams anyways.

  I managed to work around this using the API by setting the number of streams before the find information call and then restoring the value afterwards.

  inputContext->nb_streams = (uint) 2;
  
  if (ffmpeg.avformat_find_stream_info(inputContext, null) < 0)
  
  {
  
      throw new InvalidOperationException("Could not read stream information.");
  
  }
  
  inputContext->nb_streams = oldSize;

  However, I would prefer to use the CLI interface of ffmpeg.

  My current command

  ffmpeg -find_stream_info false -i http://192.168.1.112:5004/auto/v1 -c copy -map 0:v:0 -map 0:a:0 -ignore_unknown   -f hls -hls_flags delete_segments  -segment_list playlist.m3u8 -segment_list_type hls -segment_list_size 10 -segment_list_flags +live -segment_time 10 -f segment stream%%05d.ts

  Giving the following input (Unneeded logging removed)

  [mpeg2video @ 000001ce79423440] Invalid frame dimensions 0x0.
  
      Last message repeated 9 times
  
  [mpegts @ 000001ce7941b740] Could not find codec parameters for stream 5 (Unknown: none ([11][0][0][0] / 0x000B)): unknown codec
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  [mpegts @ 000001ce7941b740] Could not find codec parameters for stream 6 (Unknown: none ([11][0][0][0] / 0x000B)): unknown codec
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  [mpegts @ 000001ce7941b740] Could not find codec parameters for stream 7 
  
  (Unknown: none ([5][0][0][0] / 0x0005)): unknown codec
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  [mpegts @ 000001ce7941b740] Could not find codec parameters for stream 8 
  
  (Unknown: none ([5][0][0][0] / 0x0005)): unknown codec
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, mpegts, from 'http://192.168.1.112:5004/auto/v1':
  
    Duration: N/A, start: 91296.182311, bitrate: N/A
  
    Program 4165
  
      Stream #0:0[0x65]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 704x576 [SAR 16:11 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0x66](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 256 kb/s
  
      Stream #0:2[0x6a](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, mono, s16p, 64 kb/s (visual impaired) (dependent)
  
      Stream #0:3[0x69](eng): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
  
      Stream #0:4[0x98]: Audio: mp2 ([6][0][0][0] / 0x0006), 48000 Hz, stereo, s16p, 128 kb/s
  
      Stream #0:5[0x1c21]: Unknown: none ([11][0][0][0] / 0x000B)
  
      Stream #0:6[0x1c33]: Unknown: none ([11][0][0][0] / 0x000B)
  
      Stream #0:7[0x1bbf]: Unknown: none ([5][0][0][0] / 0x0005)
  
      Stream #0:8[0x1bc1]: Unknown: none ([5][0][0][0] / 0x0005)

  I’m unsure if there’s a way to achieve the same functionality with the CLI, however I’m open changing how my setup works.

  One idea that I considered was running two ffmpeg instances, one to strip the unneeded streams (and not find the stream info) and then have another that takes that stripped stream and performs the rest of the functionality.

  Any insight here would be grateful, thanks in advance.

• create Accord.Video.FFMPEG object intial error

  14 mars 2018, par lokcyi

  I create an project with C# Visual studio 2013 and reference Accord.Video.FFMPEG.dll.
  The Configure of projects Target Platforms is set to x86.
  It is ok while compileing.
  But,It would throw run time error when application running.
  The exception is below. showing =>This application cannot be run in 64-bits
  I have no idea what wrong with the error ?

  ---

  System.TypeInitializationException   IsTransient=false
  
    Message='<module>' 的型別初始設定式發生例外狀況。
  
    Source=VideoMarkerAccord
  
    TypeName=<module>
  
    StackTrace:
  
         於 VideoMarker.Form1.test()
  
         於 VideoMarker.Form1.ConvertVedio(Int32 iFps, Int32 bitrate, Int32 width, Int32 height, Int32 iSpeed, String sOutputPath, String xml, String sVCode) 於 d:\Projects\AForge\VideoMarkerAccord\VideoMarker\Form1.cs: 行 201
  
         於 VideoMarker.Form1.btnConvertVedio_Click(Object sender, EventArgs e) 於 d:\Projects\AForge\VideoMarkerAccord\VideoMarker\Form1.cs: 行 181
  
         於 System.Windows.Forms.Control.OnClick(EventArgs e)
  
         於 System.Windows.Forms.Button.OnClick(EventArgs e)
  
         於 System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
  
         於 System.Windows.Forms.Control.WmMouseUp(Message&amp; m, MouseButtons button, Int32 clicks)
  
         於 System.Windows.Forms.Control.WndProc(Message&amp; m)
  
         於 System.Windows.Forms.ButtonBase.WndProc(Message&amp; m)
  
         於 System.Windows.Forms.Button.WndProc(Message&amp; m)
  
         於 System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message&amp; m)
  
         於 System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message&amp; m)
  
         於 System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
  
         於 System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG&amp; msg)
  
         於 System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
  
         於 System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
  
         於 System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
  
         於 System.Windows.Forms.Application.Run(Form mainForm)
  
         於 VideoMarker.Program.Main() 於 d:\Projects\AForge\VideoMarkerAccord\VideoMarker\Program.cs: 行 18
  
         於 System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
  
         於 System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)
  
         於 System.Runtime.Hosting.ManifestRunner.Run(Boolean checkAptModel)
  
         於 System.Runtime.Hosting.ManifestRunner.ExecuteAsAssembly()
  
         於 System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext, String[] activationCustomData)
  
         於 System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext)
  
         於 System.Activator.CreateInstance(ActivationContext activationContext)
  
         於 Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone()
  
         於 System.Threading.ThreadHelper.ThreadStart_Context(Object state)
  
         於 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
  
         於 System.Threading.ThreadHelper.ThreadStart()
  
    InnerException: <crtimplementationdetails>.ModuleLoadException
  
         _HResult=-2146233088
  
         _message=The C++ module failed to load during process initialization.
  
  
  
         IsTransient=false
  
         Message=The C++ module failed to load during process initialization.
  
  
  
         Source=msvcm90
  
         StackTrace:
  
              於 <crtimplementationdetails>.ThrowModuleLoadException(String errorMessage, Exception innerException)
  
              於 <crtimplementationdetails>.ThrowModuleLoadException(String , Exception )
  
              於 <crtimplementationdetails>.LanguageSupport.Initialize(LanguageSupport* )
  
              於 .cctor()
  
         InnerException: System.InvalidOperationException
  
              _HResult=-2146233079
  
              _message=This application cannot be run in 64-bits.
  
              IsTransient=false
  
              Message=This application cannot be run in 64-bits.
  
              Source=Accord.Video.FFMPEG
  
              StackTrace:
  
                   於 _init.{ctor}(_init* )
  
                   於 ?A0xbe509209.??__E?A0xbe509209@_initializer@@YMXXZ()
  
                   於 _initterm_m((fnptr)* pfbegin, (fnptr)* pfend)
  
                   於 <crtimplementationdetails>.LanguageSupport.InitializePerProcess(LanguageSupport* )
  
                   於 <crtimplementationdetails>.LanguageSupport._Initialize(LanguageSupport* )
  
                   於 <crtimplementationdetails>.LanguageSupport.Initialize(LanguageSupport* )
  
              InnerException: 
  
  </crtimplementationdetails></crtimplementationdetails></crtimplementationdetails></crtimplementationdetails></crtimplementationdetails></crtimplementationdetails></crtimplementationdetails></module></module>

• Python animation ffmpeg error - ValueError : I/O operation on closed file

  27 février 2018, par Rob

  I’m trying to follow this example here to do a simple animation : https://matplotlib.org/examples/animation/basic_example_writer.html

  I get this error :

  ValueError                                Traceback (most recent call last)
  
  /fsr/rfs07/ELEGANCE/work/code/python/s5p/animation_test.py in <module>()
  
       25 line_ani = animation.FuncAnimation(fig1, update_line, 25, fargs=(data, l),
  
       26                                    interval=50, blit=True)
  
  ---> 27 line_ani.save('lines.mp4', writer=writer)
  
       28 
  
  
  
       29 fig2 = plt.figure()
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/site-packages/matplotlib/animation.pyc in save(self, filename, writer, fps, dpi, codec, bitrate, extra_args, metadata, extra_anim, savefig_kwargs)
  
     1061                         # TODO: See if turning off blit is really necessary
  
     1062                         anim._draw_next_frame(d, blit=False)
  
  -> 1063                     writer.grab_frame(**savefig_kwargs)
  
     1064 
  
     1065         # Reconnect signal for first draw if necessary
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/contextlib.pyc in __exit__(self, type, value, traceback)
  
       33                 value = type()
  
       34             try:
  
  ---> 35                 self.gen.throw(type, value, traceback)
  
       36                 raise RuntimeError("generator didn't stop after throw()")
  
       37             except StopIteration, exc:
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/site-packages/matplotlib/animation.pyc in saving(self, *args, **kw)
  
      287             yield self
  
      288         finally:
  
  --> 289             self.finish()
  
      290 
  
      291     def _run(self):
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/site-packages/matplotlib/animation.pyc in finish(self)
  
      307     def finish(self):
  
      308         'Finish any processing for writing the movie.'
  
  --> 309         self.cleanup()
  
      310 
  
      311     def grab_frame(self, **savefig_kwargs):
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/site-packages/matplotlib/animation.pyc in cleanup(self)
  
      346     def cleanup(self):
  
      347         'Clean-up and collect the process used to write the movie file.'
  
  --> 348         out, err = self._proc.communicate()
  
      349         self._frame_sink().close()
  
      350         verbose.report('MovieWriter -- '
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/site-packages/subprocess32.pyc in communicate(self, input, timeout)
  
      925 
  
      926         try:
  
  --> 927             stdout, stderr = self._communicate(input, endtime, timeout)
  
      928         finally:
  
      929             self._communication_started = True
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/site-packages/subprocess32.pyc in _communicate(self, input, endtime, orig_timeout)
  
     1711             if _has_poll:
  
     1712                 stdout, stderr = self._communicate_with_poll(input, endtime,
  
  -> 1713                                                              orig_timeout)
  
     1714             else:
  
     1715                 stdout, stderr = self._communicate_with_select(input, endtime,
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/site-packages/subprocess32.pyc in _communicate_with_poll(self, input, endtime, orig_timeout)
  
     1767             select_POLLIN_POLLPRI = select.POLLIN | select.POLLPRI
  
     1768             if self.stdout:
  
  -> 1769                 register_and_append(self.stdout, select_POLLIN_POLLPRI)
  
     1770                 stdout = self._fd2output[self.stdout.fileno()]
  
     1771             if self.stderr:
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/site-packages/subprocess32.pyc in register_and_append(file_obj, eventmask)
  
     1746             poller = select.poll()
  
     1747             def register_and_append(file_obj, eventmask):
  
  -> 1748                 poller.register(file_obj.fileno(), eventmask)
  
     1749                 self._fd2file[file_obj.fileno()] = file_obj
  
     1750 
  
  
  
  ValueError: I/O operation on closed file
  
  </module>

  ffmpeg on it’s own outside of python seems to work ok so I’m not really sure how to get this working ?

  I’ve tried using imagemagick as an alternative

  e.g.
  line_ani.save(’lines.gif’, writer=’imagemagick’)

  but this results in the gif jumping around between frames