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Autres articles (104)
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Modifier la date de publication
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Il faut au préalable rajouter un champ "Date de publication" dans le masque de formulaire adéquat :
Administrer > Configuration des masques de formulaires > Sélectionner "Un média"
Dans la rubrique "Champs à ajouter, cocher "Date de publication "
Cliquer en bas de la page sur Enregistrer -
Publier sur MédiaSpip
13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
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Encoding and processing into web-friendly formats
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Sur d’autres sites (9350)
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Linking my static C++ library with libavutil cause to undefined reference
22 mai 2023, par folibisI'm facing some strange problem. I have a static library that uses the Ffmpeg libraries internally. For some reason I get the error :

undefined reference to `av_log_set_level(int)

the code is as follows :


#ifdef __cplusplus
extern "C" {
#endif
#include <libavcodec></libavcodec>avcodec.h>
#include <libavutil></libavutil>avutil.h>
#ifdef __cplusplus
}
#endif
int some_func()
{
 av_log_set_level(AV_LOG_QUIET); 
}


As you can see the Ffmpeg libraries are enclosed into
extern "C".
I use CMake file, that looks like follows :

cmake_minimum_required (VERSION 3.23)

add_library(MyLib STATIC lib.cpp)
target_link_libraries(MyLib -lavformat -lavcodec -lswscale -lavutil)

add_executable(MyApp main.cpp)
target_link_libraries(MyApp MyLib -lavformat -lavcodec -lswscale -lavutil)


But nothing helps, I still get the same error.


I've tried to check the symbols of my library with nm :


nm .MyLib.a | grep av_log_set_level
U _Z16av_log_set_leveli


the same function in libavutil :


nm /usr/lib/x86_64-linux-gnu/libavutil.a | grep av_log_set_level
0000000000000ff0 T av_log_set_level


I guess that for some reason my static library uses c++ mangling and so it looks for the incorrect function,
_Z16av_log_set_leveliinstead ofav_log_set_levelthat causes for undefined reference error. What can I do, how can I fix that ?

The environment :


- 

- Ubuntu 22.04
- g++ 9.4.0
- libavutil-dev:amd64 7:4.2.7-0ubuntu0.1








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src/test_streams/ : Pull out write_simple_wavex_header() for reuse.
19 décembre 2014, par Erik de Castro Lopo -
Internet explorer does not support HTML5 video with height greater than 1088px
25 novembre 2015, par evilgucThe company I’m working at writing a web app which allows users to work with media files uploaded from mobile devices.
To unify HTML5 video sources I decided to convert all the videos using H.264 codec in mp4 container and setting width to 1280px.
During the fixing one of the issues with an app I decided to use 4:3 video file with 256x240px resolution. Since I convert all the files to HD resulting file became 1280x1200px and for some reason it isn’t playable in IE10 and IE11 (in other browsers going well).
So I spend a lot of time trying to figure out the reason.
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