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

  20 juin 2018, 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.

• How to get a list of libraries ffmpeg has linked to (static ffmpeg libraries) ?

  6 octobre 2018, par myWallJSON

  I have compiled Ffmpeg (1.0) with newt configuration :

  ./configure  --disable-doc  --disable-ffplay --disable-ffprobe  --disable-ffserver    --disable-avdevice   --disable-avfilter   --disable-pthreads  --disable-everything --enable-muxer=flv --enable-encoder=flv --enable-encoder=h263 --disable-mmx  --disable-shared   --prefix=bin/  --disable-protocols --disable-network --disable-debug  --disable-asm --disable-stripping

  It compiled - no errors - headers and libs (static .a) are in place. (special experimental cigwin, experimental gcc, with no asm options, and no known by ffmpeg platform defines) (yet I have compiled and tested boost on it)

  Now I try to compile my app. I get next exceptions :

  ../ffmpeg-1.0/bin/lib/libavcodec.a: error: undefined reference to 'exp'
  
  ../ffmpeg-1.0/bin/lib/libavcodec.a: error: undefined reference to 'log'

  My compiler build line looks like this :

  g++ -static -emit-swf -o CloudClient.swf  -I../boost/boost_libraries/install-dir/include -I../ffmpeg-1.0/bin/include -L../boost/boost_libraries/install-dir/lib -L../ffmpeg-1.0/bin/lib \
  
      timer.o \
  
      audio_encoder.o \
  
      audio_generator.o \
  
      video_encoder.o \
  
      video_generator_rainbow.o \
  
      simple_synchronizer.o \
  
      multiplexer.o \
  
      transmitter.o \
  
      graph_runner.o \
  
      cloud_client.o \
  
      -pthread \
  
      -lswscale \
  
      -lavutil \
  
      -lavformat \
  
      -lavcodec \
  
      -lboost_system \
  
      -lboost_date_time \
  
      -lboost_thread 

  So as you see quite complex and I already have all object files compiled and ready... Only one thing left - link it all to ffmpeg (striped from ffmpeg version compiled with boost)

  Tried adding -lm - no help...

  Well here my question is - how to get list of libraries ffmpeg linked to (like -lm etc) ?

• How is decoded audio data stored in ffmpeg AVFrame ?

  23 février 2023, par necrosato

  I'm looking for clarification on how ffmpeg stores decoded audio data in frames before I start writing code to do audio mixing. AVFrame has int format and uint8_t* data[] members. If my understanding is correct, then the bytes in data should be cast to the proper type for format before working with it. So to do a simple 2x level boost if format == AV_SAMPLE_FMT_S16, I would :

  



  int16_t* audio_samples = frame->data[0];
int num_samples = frame->nb_samples * frame->channels;
for (int i = 0; i < num_samples; ++i) {
  audio_samples[i] = audio_samples[i] * 2;
}


  



  Is this the correct way of going about things ?