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• FFMPEG compilation without compiler optimization

  11 juin 2014, par Kamil_H

  I’m compiling ffmpeg for win32 using Microsoft cl compiler. I need to compile it without any optimization, so added configure —extra-cflags= -Od".

  Compilation goes fine, but there are a few places like this :

  Last 3 ifs.

  The code compiles, but doesn’t link because calls like ff_sbrdsp_init_arm(s) ; are not removed by compiler. Of course everything is fine when compiling with optimization. Then compiler removes all if(0)s.

  There are several similar places in ffmpeg. Why if(0) is used instead of preprocessor’s #if 0 ?

  Is there any hidden trick behind this ?

• libavutil/hwcontext_d3d11va : adding more texture information to the D3D11 hwcontext API

  20 août 2021, par Artem Galin

  libavutil/hwcontext_d3d11va : adding more texture information to the D3D11 hwcontext API
  Microsoft VideoProcessor requires texture with D3DUSAGE_RENDERTARGET flag as output.
  
  There is no way to allocate array of textures with D3D11_BIND_RENDER_TARGET flag
  
  and .ArraySize > 2 by ID3D11Device_CreateTexture2D due to the Microsoft limitation.
  
  Adding AVD3D11FrameDescriptors array to store array of single textures
  
  instead of texture with multiple slices resolves this.
  Signed-off-by : Artem Galin <artem.galin@intel.com>
  

  • [DH] doc/APIchanges
  • [DH] libavutil/hwcontext_d3d11va.c
  • [DH] libavutil/hwcontext_d3d11va.h
  • [DH] libavutil/hwcontext_qsv.c
  • [DH] libavutil/version.h

• Warning VSP2005 & Error VSP1048 when instrumenting C++ code dynamically linked to FFMPEG

  6 mai 2015, par TTJG

  I am trying to profile my project with the Instrumentation profiler of Visual Studio 2013 Ultimate. I have a 64bit C++ project which is dynamically linked to FFMPEG. However, the profiler is giving me the following error Error VSP1048: Internal instrumentation error. I don’t want to profile FFMPEG but only analyze the performance of my code. I downloaded the pre-built FFMPEG libs from this site ffmpeg.zeranoe.com/builds/. The project is also linking against Boost, live555 and x264. It is running and debugging fine. The full output of the profiler is :

  Profiling started.
  
  Instrumenting ...\Player.exe in place
  
  Info VSP3049: Small functions will be excluded from instrumentation.
  
  Microsoft (R) VSInstr Post-Link Instrumentation 12.0.21005 x64
  
  Copyright (C) Microsoft Corp. All rights reserved.
  
  Warning VSP2005: Internal instrumentation warning: The object '...\ffmpeg-20150506-git-a2190de-win64-dev\lib\avutil.lib(dbyqh.o)' was built without debug information.
  
  File to Process:
  
  \Player.exe --> ...\Player.exe
  
  Original file backed up to ...\Player.exe.orig
  
  Warning VSP2005: Internal instrumentation warning: The object '...\ffmpeg-20150506-git-a2190de-win64-dev\lib\avutil.lib(dbyqh.o)' was built without debug information.
  
  Error VSP1048: Internal instrumentation error.
  
  PRF0002: Instrumentation failed with these options: /u "...\Player.exe"   /excludesmallfuncs.  Please check the output window for additional details.
  
  Data written to ...\Player150506.vsp.
  
  Profiling finished.
  
  File contains no data buffers
  
  File contains no data buffers
  
  Analysis failed
  
  Profiling complete.

  Any ideas how this could be solved ? I have found very little about this issue on the Internet.