Compiling OCC 7.4.0: unresolved external symbols

Francois Lauzon
Wed, 10/02/2019 - 00:58

Forums:

Hello,

I am trying to build OCC 7.4.0 on Windows 10 using Visual Studio 2017 for x64 and everything compile fine except for the Media lib, which I have to following unresolved message:

1>Media_CodecContext.obj : error LNK2019: unresolved external symbol avcodec_free_context referenced in function "public: virtual __cdecl Media_CodecContext::~Media_CodecContext(void)" (??1Media_CodecContext@@UEAA@XZ)
1>Media_CodecContext.obj : error LNK2019: unresolved external symbol avcodec_parameters_to_context referenced in function "public: bool __cdecl Media_CodecContext::Init(struct AVStream const &,double,int,int)" (?Init@Media_CodecContext@@QEAA_NAEBUAVStream@@NHH@Z)
1>Media_CodecContext.obj : error LNK2019: unresolved external symbol avcodec_send_packet referenced in function "public: bool __cdecl Media_CodecContext::SendPacket(class opencascade::handle<class Media_Packet> const &)" (?SendPacket@Media_CodecContext@@QEAA_NAEBV?$handle@VMedia_Packet@@@opencascade@@@Z)
1>Media_CodecContext.obj : error LNK2019: unresolved external symbol avcodec_receive_frame referenced in function "public: bool __cdecl Media_CodecContext::ReceiveFrame(class opencascade::handle<class Media_Frame> const &)" (?ReceiveFrame@Media_CodecContext@@QEAA_NAEBV?$handle@VMedia_Frame@@@opencascade@@@Z)
1>Media_Packet.obj : error LNK2019: unresolved external symbol av_packet_alloc referenced in function "public: __cdecl Media_Packet::Media_Packet(void)" (??0Media_Packet@@QEAA@XZ)
1>Media_Packet.obj : error LNK2019: unresolved external symbol av_packet_free referenced in function "public: virtual __cdecl Media_Packet::~Media_Packet(void)" (??1Media_Packet@@UEAA@XZ)
1>Media_Packet.obj : error LNK2019: unresolved external symbol av_packet_unref referenced in function "public: void __cdecl Media_Packet::Unref(void)" (?Unref@Media_Packet@@QEAAXXZ)
1>C:\OCC\occt-740-build-vc14-x64\win64\vc14\bin\TKService.dll : fatal error LNK1120: 7 unresolved externals
1>Done building project "TKService.vcxproj" -- FAILED.

I have look at the Visual Studio project and everything look fine, the ffmpeg-3.3-64 includes and libs are correctly defined.

Anyone had this problem?

Best regards,

François.

Kirill Gavrilov
Wed, 10/02/2019 - 09:35

This is because ffmpeg-3.3-64 from "3rd-party" page lacks some symbols used by OCCT 7.4.0. The page should be updated.
https://www.opencascade.com/content/3rd-party-components

Kirill Gavrilov
Wed, 10/02/2019 - 13:39

Please try with updated FFmpeg 3.3.4 on the page.

Francois Lauzon
Wed, 10/02/2019 - 13:49

Thanks Kirill,

I will reconfigure CMake and relauch the build with the FFmpeg libs and post here later if it resolve my issue or not.

François.

Francois Lauzon
Wed, 10/02/2019 - 14:21

Problem solve using the new libs,

Thanks,

François.

Fengwei Ping
Thu, 11/21/2019 - 05:04

The ffmpeg-3.3.4-64 has been included in the OCC 7.4.0-vc14-64, after adding the including and library directories, I have built the codes on windows10 vs2017.

mustap_161726
Thu, 12/10/2020 - 02:24

I tried the ffmpeg 3.3.4 libraries. it didn't work. I'm building opencascade-7.5.0 in msvc (2019).

I even built ffmpeg-4.3.1 libraries. The problem wasn't resolved.

I get 61 LNK errors. All in TKService.

mustap_161726
Wed, 12/16/2020 - 22:16

HI,

I'm still struggling with these errors. Please see attached VS output.

Any help will be appreciated. Regards

Attachments:

OCCT_LNK_ERR.txt