FFMPEG关于多个功能的未定义引用

ffmpeg undefined references on multiple functions

本文关键字:未定义 引用 功能 于多个 FFMPEG      更新时间:2023-10-16

我正在尝试编译一个在Ubuntu上使用FFMPEG的应用程序,并且我正在遇到以下错误。

undefined reference to `av_write_image_line2'
undefined reference to `av_hwframe_transfer_data'
undefined reference to `av_hwdevice_get_hwframe_constraints'
undefined reference to `av_hwframe_get_buffer'
undefined reference to `av_hwdevice_ctx_create_derived'
undefined reference to `xcb_xfixes_get_cursor_image_cursor_image'
undefined reference to `xcb_xfixes_query_version'
undefined reference to `avpriv_slicethread_execute'
undefined reference to `avcodec_parameters_to_context'
undefined reference to `xcb_xfixes_get_cursor_image_reply'
undefined reference to `av_hwdevice_find_type_by_name'
undefined reference to `av_hwframe_map'
undefined reference to `av_spherical_tile_bounds'
undefined reference to `av_malloc_array'
undefined reference to `av_hwframe_transfer_get_formats'
undefined reference to `av_hwframe_ctx_alloc'
undefined reference to `xcb_shape_rectangles'
undefined reference to `av_stereo3d_type_name'
undefined reference to `avpriv_slicethread_free'
undefined reference to `avpriv_slicethread_create'
undefined reference to `xcb_xfixes_get_cursor_image'
undefined reference to `av_hwframe_ctx_init'
undefined reference to `avpriv_register_devices'
undefined reference to `av_hwframe_constraints_free'
undefined reference to `av_audio_fifo_peek_at'
undefined reference to `av_get_extended_channel_layout'
undefined reference to `av_hwframe_ctx_create_derived'
undefined reference to `xcb_xfixes_query_version_reply'
undefined reference to `av_mallocz_array'
undefined reference to `av_read_image_line2'

ffmpeg的版本我有:

ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.11) 20160609
configuration: --enable-pic --pkg-config-flags=--static --extra-libs='-lpthread -lm'
libavutil      56. 22.100 / 56. 22.100
libavcodec     58. 35.100 / 58. 35.100
libavformat    58. 20.100 / 58. 20.100
libavdevice    58.  5.100 / 58.  5.100
libavfilter     7. 40.101 /  7. 40.101
libswscale      5.  3.100 /  5.  3.100
libswresample   3.  3.100 /  3.  3.100

在我的makefile中,我添加了-lavutil -lavcodec -lavdevice -lavfilter -lavfilter -lavformat -lswresample -lswsample -lswscame -lswscale -lswscale到我的链接步骤。

我在做什么错?这些是否在我拥有的ffmpeg版本中进行了弃用?

ffmpeg标头是纯C标头。因此,如果您想在C 应用程序中使用它们,则需要包围extern "C"声明的Include语句。例如:

extern "C"
{
    #include <libavcodec/avcodec.h>
}

如果尚不清楚该声明在做什么,这里有很好的解释。

这可能是由于您的编译器无法找到所需组件的正确位置。如果您知道他们的下落,则可以尝试使用" Symlink"将其链接到编译器正在查看的目录/地点。

eg:

ln -s/path/of/of/the/library/path/you/way/it/to/to/be/be找到