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• Libavcodec "the procedure entry point for av_frame_alloc could not be located" error in Visual Studio 2017 C++ project

  25 novembre 2019, par Aves

  I am trying to use libavcodec from ffmpeg library in C++ with Visual Studio 2017 Community. I downloaded the latest x64 dev and shared builds from zeranoe (version 20171217), set up include directories and additional libraries in Visual Studio for x64 build, added DLL files from shared package to my PATH.

  This is my sample test code :

  extern "C" {
  
  #include 
  
  }
  
  int main() {
  
      avcodec_register_all();
  
      AVFrame *pAvFrame = av_frame_alloc();
  
      av_frame_free(&pAvFrame);
  
      return 0;
  
  }

  The code compiles without problems but when I run the application I see a dialogue window with error message "the procedure entry point for av_frame_alloc could not be located in DLL" (actual message is not in English, this is the translated version).

  I tried to set Linker->Optimization->References to /OPT:NOREF as it was advised in the similar questions but it did not help.

  Dependency walker shows that av_frame_alloc is exported, "Entry Point" is not bound. A little bit strange is that av_frame_alloc is displayed in both avcodec-58.dll (as red) and avutil-56.dll (as green). Maybe the reason is that the application is trying to get this function from avcodec instead of avutil, but I’m not sure, since I did not check the source code of these libraries.

  So the question is how to set up such a simple FFMPEG-based C++ project in VS2017, where I’m wrong ?

  UPD. 1.

  Linker flags : /OUT :"C :\work\code\TestFfmpeg\x64\Release\TestFfmpeg.exe" /MANIFEST /NXCOMPAT /PDB :"C :\work\code\TestFfmpeg\x64\Release\TestFfmpeg.pdb" /DYNAMICBASE "c :\work\dev\ffmpeg-20171217-387ee1d-win64-dev\lib*.lib" "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib" /DEBUG:FULL /MACHINE:X64 /OPT:NOREF /PGD :"C :\work\code\TestFfmpeg\x64\Release\TestFfmpeg.pgd" /MANIFESTUAC :"level=’asInvoker’ uiAccess=’false’" /ManifestFile :"x64\Release\TestFfmpeg.exe.intermediate.manifest" /OPT:ICF /ERRORREPORT:PROMPT /NOLOGO /TLBID:1

• Documentation #3972 : template variants and possible bug ?

  6 juillet 2017, par Kamran Mir Hazar

  I have SPIP 3.1.6 [23444].

  On Thu, Jul 6, 2017 at 8:20 PM, <redmine@spip.org> wrote :

  La demande #3972 a été mise à jour par nico d_.

  Hi,
  which version of SPIP are you using ?

  ---

  Anomalie #3972 : template variants and possible bug ?

  Auteur : Kamran Mir Hazar
  Statut : Nouveau
  Priorité : Normal
  Assigné à :
  Catégorie :
  Version cible :
  Resolution :
  Navigateur :

  Hello,
  The following template variants do not work for me :
  I have section number 101, with articles in fa and en languages in it.
  I have also files article.html for the main site’s language which is fa, and
  article.en.html for the en language articles. Both work fine in general. I
  created two other variants to apply articles in section 101 with two
  separate languages. They are : article=101.fa.html and article=101.en.html .
  SPIP ignores these two variants and proceeds article.html for fa language
  articles, and article.en.html for en language articles in section 101, like
  the other sections. I added also article=101.html to see if it works, but
  didn’t.
  I asked this in French and English mailing lists, but couldn’t find any
  solution.
  Thank you
  Kamran

  PS : I tried based of the following article :
  https://www.spip.net/en_article4363.html

  ---

  Vous recevez ce mail car vous êtes impliqués sur ce projet.
  Pour changer les préférences d’envoi de mail, allez sur
  http://core.spip.org/my/account

• Transcoding HD RTP/UDP stream with FFMPEG

  19 juin 2017, par SudoSu

  I’ve a Tera STI440 streamer with two inputs used (for TV channel streaming). When I watch the source stream it seems allright, but when I start FFMPEG transcoding, the image is going to collapse on random times (probably around every 5-15 sec). The transcoding is okay with SD 480P streams.

  FFPROBE one of my HD stream :
  `

  Input #0, rtp, from 'rtp://239.192.24.3:1234/':
  
    Duration: N/A, start: 18002.926656, bitrate: N/A
  
    Program 202 
  
      Metadata:
  
        service_name    : M5 HD
  
        service_provider: Magyar Televizio
  
      Stream #0:1: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, top first), 1440x1080 [SAR 4:3 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:0(hun): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 enter code herekb/s

  FFPROBE one of my SD stream (Which is working properly) :

  Input #0, rtp, from 'rtp://239.192.24.4:1234/':
  
    Duration: N/A, start: 51003.435044, bitrate: N/A
  
    Program 203 
  
      Metadata:
  
        service_name    : RTL Klub
  
        service_provider: Magyar RTL Telev�zi� Zrt.
  
      Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt470bg, top first), 720x576 [SAR 12:11 DAR 15:11], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1(hun): Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp

  I want to do a HLS stream so I ran this script for FFMPEG :

  /usr/bin/ffmpeg -loglevel 16 -i rtp://239.192.24.3:1234/ -s pal -c:v libx264 -c:a libmp3lame -b:v 1000k -b:a 96k -ar 44100 -vf 'yadif=0:-1:1' -preset:v superfast -f hls -hls_time 7 -hls_list_size 10 -hls_wrap 10 -hls_base_url http://10.3.1.3:8080/ts/ -hls_segment_filename /tvman/hls_out/ts/M5_hq_%03d /tvman/hls_out/subplaylist/M5-hq.m3u8

  I access the playlist file from NGINX but also tried Apache too.
  Here’s some log from FFMPEG process (loglevel 16)

  I made some diagnostics :

  • Looked for network traffic (it’s around 60 mbps, so it should be okay with a 100mbps ethernet
  • CPU & RAM load allright
  • I reduced the network traffic by turning off TV channel streams on streamer. It was around 6-7 mbps.

  If you need any more information, I’ll provide it for you.
  Thanks for the help !

  P.S. : I’m not native English speaker, so sorry for mistakes. :)