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• ffmpeg program written in C, cannot open my camera in macOS Catalina 10.15.7

  27 mai 2022, par marco0631

  #include 
#include 
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libavdevice/avdevice.h"

AVFormatContext* openCamera(void) {
    avdevice_register_all();
    AVFormatContext *ctx = avformat_alloc_context();
    AVInputFormat *ifmt = av_find_input_format("avfoundation");
    if (ifmt != NULL) {
        AVDictionary *opts = NULL;
        av_dict_set(&opts, "video_size", "1280x720", 0);
        av_dict_set(&opts, "framerate", "30", 0);
        av_dict_set(&opts, "pixel_format", "uyvy422", 0);
        
        int ret = avformat_open_input(&ctx, "0", ifmt, &opts);
        if (ret != 0) {
            printf("no");
            avformat_free_context(ctx);
            return NULL;
        }
    }
    return ctx;
}

int main(int argc, const char *argv[]) {
    openCamera();
}



  


  My code run on Xcode. After I have added the plist file, the running program camera opens for about half a second and then closes. and console output

  


  2022-02-22 00:39:19.372178&#x2B;0800 ffmpeg-tool[5977:195724] [plugin] AddInstanceForFactory: No factory registered for id <cfuuid 0x10640cf60="0x10640cf60"> F8BB1C28-BAE8-11D6-9C31-00039315CD46&#xA;2022-02-22 00:39:19.434783&#x2B;0800 ffmpeg-tool[5977:195724]  HALC_ShellDriverPlugIn::Open: Can&#x27;t get a pointer to the Open routine&#xA;2022-02-22 00:39:19.435262&#x2B;0800 ffmpeg-tool[5977:195724]  HALC_ShellDriverPlugIn::Open: Can&#x27;t get a pointer to the Open routine&#xA;2022-02-22 00:39:19.501780&#x2B;0800 ffmpeg-tool[5977:195724] [plugin] AddInstanceForFactory: No factory registered for id <cfuuid 0x10640f860="0x10640f860"> 30010C1C-93BF-11D8-8B5B-000A95AF9C6A&#xA;2022-02-22 00:39:19.605797&#x2B;0800 ffmpeg-tool[5977:195724] Metal API Validation Enabled&#xA;2022-02-22 00:39:21.701071&#x2B;0800 ffmpeg-tool[5977:195724] [] CMIOHardware.cpp:917:CMIODeviceStopStream the System is exiting&#xA;2022-02-22 00:39:21.701268&#x2B;0800 ffmpeg-tool[5977:195724] [] CMIOHardware.cpp:1332:CMIOStreamCopyBufferQueue the System is exiting&#xA;2022-02-22 00:39:21.701538&#x2B;0800 ffmpeg-tool[5977:195724] [] CMIOHardware.cpp:333:CMIOObjectGetPropertyData the System is exiting&#xA;2022-02-22 00:39:21.701767&#x2B;0800 ffmpeg-tool[5977:195724] [] CMIO_DALA_System.cpp:264:GetPropertyData error 1970171760 (unop) getting property selector (inot) scope (glob) element 0&#xA;2022-02-22 00:39:21.702472&#x2B;0800 ffmpeg-tool[5977:195724] [] CMIOHardware.cpp:333:CMIOObjectGetPropertyData the System is exiting&#xA;2022-02-22 00:39:21.702662&#x2B;0800 ffmpeg-tool[5977:195724] [] CMIO_DALA_System.cpp:264:GetPropertyData error 1970171760 (unop) getting property selector (inot) scope (glob) element 0&#xA;Program ended with exit code: 0&#xA;</cfuuid></cfuuid>

  


  How can I solve this problem ?

  


• FFmpeg can't read a video stream, but VLC reads it fine

  21 mai 2022, par J.Doe

  I have a video stream that I can access using VLC, but can't access with ffmpeg. This used to work before I moved onto using a new computer (but with same camera).

  


  This is the ffprobe command (made up IP addr) :

  


  ffprobe -hide_banner -rtsp_transport tcp "rtsp://root:pass@12.34.567.890:80/axis-media/media.amp?event=on&eventtopic=onvif:VideoSource/MotionAlarm/."

  


  It returns

  


  rtsp://root:pass@12.34.567.890:80/axis-media/media.amp: Invalid data found when processing input


  


  I've not found very much on this problem :

  


  

  • I've tried turning it off and on again

  


  • I looked through this github issue but there were no solutions

  


  • I know it supports TCP since it's the same command as when it worked last time.

  


  


  Any ideas how I can get ffmpeg to read the stream ?

  


  Edit : Output of -report below, I'm afraid it's not very helpful :

  


  ffprobe started on 2022-05-21 at 06:27:54
Report written to "ffprobe-20220521-062754.log"
Log level: 48
Command line:
ffprobe -hide_banner -report -rtsp_transport tcp 
"rtsp://root:pass@IPADDR:80/axis-media/media.amp? 
event=on&eventtopic=onvif:VideoSource/MotionAlarm/."
[tcp @ 0000023967a2f8c0] No default whitelist set
[tcp @ 0000023967a2f8c0] Original list of addresses:
[tcp @ 0000023967a2f8c0] Address IPADDR port 80
[tcp @ 0000023967a2f8c0] Interleaved list of addresses:
[tcp @ 0000023967a2f8c0] Address IPADDR port 80
[tcp @ 0000023967a2f8c0] Starting connection attempt to IPADDR port 80
[tcp @ 0000023967a2f8c0] Successfully connected to IPADDR port 80
rtsp://root:pass@IPADDR:80/axis-media/media.amp?event=on&eventtopic=onvif:VideoSource/MotionAlarm/.: Invalid data found when processing input


  


• "Undefined referance to function" while linking ffmpeg [duplicate]

  19 mai 2022, par user19068953

  I'm trying to link ffmpeg on ubuntu, i downloaded ffmpeg source and added to my lib/ffmpeg library then ran ./configure, i created a cmake on my project directory and one inside ffmpeg dir. The cmake compiles just fine but when i run make it just gives me an error saying Undefined referance to avformat_alloc_context(), it says this for all functions but the structs, typedefs and defines compile just fine. Here are my files :

  


  ./cmake :

  


  cmake_minimum_required(VERSION 3.14)

set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
project(Interview C CXX)

add_definitions(-DGL_SILENCE_DEPRECATION)

SET(EXECUTABLE_OUTPUT_PATH ${dir}/bin )
set( CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/bin )

file(GLOB_RECURSE SOURCE_FILES 
    ${CMAKE_SOURCE_DIR}/src/*.c
    ${CMAKE_SOURCE_DIR}/src/*.cpp
    # last resort
    ${CMAKE_SOURCE_DIR}/lib/ffmpeg/*/*.c
)
    
# Add header files
file(GLOB_RECURSE HEADER_FILES 
    ${CMAKE_SOURCE_DIR}/src/*.h
    ${CMAKE_SOURCE_DIR}/src/*.hpp
    # last resort
    ${CMAKE_SOURCE_DIR}/lib/ffmpeg/*/*.h
)

list(APPEND SOURCES
    src/main.cpp
    src/vipch.h
    src/VideDecoder.cpp
    src/VideoDecoder.h
    src/Application.cpp
    src/Application.h
    src/OpenGLRender.cpp
    src/OpenGLRender.h
    src/Layer.h
    src/Layer.cpp

    # last resort
    lib/ffmppeg/*/*.h
    lib/ffmppeg/*/*.c
)
add_executable(Interview src/main.cpp)

# ffmpeg linking -----------------------------------------------


add_library(ffmpeg STATIC IMPORTED)
add_subdirectory(lib/ffmpeg)

target_include_directories(Interview PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/lib/ffmpeg)

link_directories(${CMAKE_SOURCE_DIR}/lib)

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/")


  


  The cmake files are a bit messy since i am trying to figure this out.
./lib/ffmpeg/cmake :

  


  cmake_minimum_required(VERSION 3.14)
project(ffmpeg)

list(APPEND SOURCES
    libavformat/avformat.h
    libavformat/avformat.c
)

file(GLOB_RECURSE SOURCE_FILES 
    ${CMAKE_SOURCE_DIR}/*/*.c
)   
# Add header files
file(GLOB_RECURSE HEADER_FILES 
    ${CMAKE_SOURCE_DIR}/*/*.h
)

include_directories(${CMAKE_SOURCE_DIR}/libavformat)
link_directories(${CMAKE_SOURCE_DIR}/libavformat)


  


  and my main file that i run my test src/main.cpp :

  


    extern "C"{&#xA;    #include <libavformat></libavformat>avformat.h>&#xA;}&#xA;&#xA;#include <iostream>&#xA;int main(int argc, char* argv[]) {&#xA;    AVFormatContext* context; &#xA;    context = avformat_alloc_context();&#xA;    std::cout &lt;&lt; context &lt;&lt; std::endl;&#xA;}&#xA;</iostream>

  


  Again, no problem when using type's like AVFormatContext and defines but when i use a function like avformat_alloc_context it gives of this error (the source files are inside ffmpeg, i can inspect them with ctrl right-click on VSCode) :

  


   /usr/bin/ld: CMakeFiles/Interview.dir/src/main.cpp.o: in function main': main.cpp: 
   (.text+0x4e): undefined reference to avformat_alloc_context' collect2: error: ld returned 1 
   exit status make[2]: *** [CMakeFiles/Interview.dir/build.make:84: bin/Interview] Error 1 
   make[1]: *** [CMakeFiles/Makefile2:96: CMakeFiles/Interview.dir/all] Error 2 make: *** 
   [Makefile:84: all] Error 2


  


  Edit :
I edited the cmake file but now im getting a different error :

  


  find_path(AVCODEC_INCLUDE_DIR NAMES "avformat.h" PATHS 
${CMAKE_CURRENT_SOURCE_DIR}/lib/ffmpeg/libavformat)
find_library(AVCODEC_LIBRARY avformat)

link_directories(${CMAKE_SOURCE_DIR}/lib)

add_executable(Interview src/main.cpp)

target_include_directories(Interview PRIVATE ${AVCODEC_INCLUDE_DIR})
target_link_libraries(Interview PRIVATE avformat)

add_library(ffmpeg STATIC IMPORTED)
add_subdirectory(lib/ffmpeg)

target_include_directories(Interview PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/lib/ffmpeg)

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/")


  


  Note : AVCODEC_LIBRARY returns notfound cmake error but just using avcodec in target_link_libraries somehow doesn't result in a cmake error, however when i run make like this it gives this error :

  


  usr/bin/ld: cannot find -lavformat collect2: error: ld returned 1 exit status make[2]: *** [CMakeFiles/Interview.dir/build.make:84: bin/Interview] Error 1 make[1]: *** [CMakeFiles/Makefile2:96: CMakeFiles/Interview.dir/all] Error 2 make: *** [Makefile:84: all] Error 2