Windows-specific WebRTC build instructions

Install Ninja

Download binaries: https://github.com/ninja-build/ninja and add them to PATH!

Or use this code snippet:

mkdir ninja_install
curl -L https://github.com/ninja-build/ninja/releases/download/v1.11.1/ninja-win.zip --output ninja-win.zip && unzip ninja-win.zip -d ninja_install
export PATH=`pwd`/ninja_install:$PATH

Create working directory

mkdir workdir
cd workdir
git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
export PATH=`pwd`/depot_tools:$PATH

Important: Make sure there is no Python in PATH! where python should return path to depot_tools!

Clone webrtc

cd depot_tools
gclient

mkdir webrtc_checkout
cd webrtc_checkout
fetch --nohooks webrtc
gclient sync --nohooks

cd src
git fetch --all
git checkout -b head_4664 refs/remotes/branch-heads/4664

gclient sync --nohooks

SET DEPOT_TOOLS_WIN_TOOLCHAIN=0
gclient runhooks

Generating & compiling project

Define environment variable: SET DEPOT_TOOLS_WIN_TOOLCHAIN=0

To generate standalone webrtc.lib (won't be compatible with Unreal!): gn gen --ide=vs2019 out/release_no_h264 --args="target_winuwp_family=\"desktop\" is_component_build=false rtc_include_tests=false rtc_use_h264=false use_rtti=true enable_google_benchmarks=false rtc_disable_logging=true treat_warnings_as_errors=false is_clang=true rtc_include_ilbc=false use_custom_libcxx=false is_debug=false rtc_enable_protobuf=false rtc_build_examples=false use_lld=false rtc_include_internal_audio_device=false enable_libaom=false target_cpu=\"x64\""

Now go to out/release_no_h264 and open all.sln in Visual Studio 2019!

Note: All gn gen <...> commands must be called from within <WEBRTC_CHECKOUT_DIR>/src

Patch the Code (to use webrtc.lib in Unreal)

First step is make webrtc code "compatible" with Unreal engine.

1. Copy WebRTC includes

Copy all WebRTC includes from Unreal Engine 5.1.1 directory (from thirdparty) to <WEBRTC_CHECKOUT_DIR>/src with replacement(!).

2. WebRTC codebase fixes

In <WEBRTC_CHECKOUT_DIR>/src/rtc_library/platform_thread.cc comment out all usages of:

SetThreadPriority
SetPriority
rtc::SetCurrentThreadName

In platform_thread.h replace the following line PlatformThread(Handle handle, bool joinable, const absl::string_view& name, std::unique_ptr<PlatformThread>&& personal_id); with PlatformThread(Handle handle, bool joinable);

In each RTCOutboundRTPStreamStats constructor method initialize avg_send_delay member variable (set it to 0).

3. Patch webrtc BUILD.gn

Add defines += ["DISABLE_H265", "RTC_DISABLE_LOGGING"] to <WEBRTC_CHECKOUT_DIR>/src/BUILD.gn, to the block config("common_inherited_config")

4. Modify compiler switches:

Edit build\config\win\BUILD.gn:
- Change all /MT to /MD, and /MTd to /MDd.
- Change all cflags = [ "/MDd" ] to [ "/MDd", "-D_ITERATOR_DEBUG_LEVEL=2", "-D_HAS_ITERATOR_DEBUGGING=1" ].

Edit build\config\compiler\BUILD.gn: Change:

  if (is_win) {
    if (is_clang) {
      cflags = [ "/Z7" ]  # Debug information in the .obj files.
    } else {
      cflags = [ "/Zi" ]  # Produce PDB file, no edit and continue.
    }

to:

  if (is_win) {
    if (is_clang) {
      cflags = [ "/Z7", "/std:c++17", "/Zc:__cplusplus" ]  # Debug information in the .obj files.
    } else {
      cflags = [ "/Zi", "/std:c++17", "/Zc:__cplusplus" ]  # Produce PDB file, no edit and continue.
    }

5. Modify abseil-cpp

Go to <WEBRTC_CHECKOUT_DIR>\src\third_party\abseil-cpp\absl\base\options.h and redefine the following constants:

#define ABSL_OPTION_USE_STD_ANY 0
#define ABSL_OPTION_USE_STD_OPTIONAL 0
#define ABSL_OPTION_USE_STD_STRING_VIEW 0
#define ABSL_OPTION_USE_STD_VARIANT 0

6. Exclude BoringSSL

Unreal OpenSSL will be used when linking WebRTC static library. The following patches are needed even though SSL is excluded in the gn gen build commands.

Edit *third_party\libsrtp\BUILD.gn: Change:

public_deps = [
  "//third_party/boringssl:boringssl",
]

To:

public_deps = [
  # "//third_party/boringssl:boringssl",
]

Edit third_party\usrsctp\BUILD.gn: Change:

deps = [ "//third_party/boringssl" ]

To:

deps = [
  # "//third_party/boringssl"
]

Edit base\BUILD.gn: In the code under:

# Use the base implementation of hash functions when building for
# NaCl. Otherwise, use boringssl.

Change:

if (is_nacl) {

To:

# if (is_nacl) {
if (true) {

Edit rtc_base\BUILD.gn: Change:

if (rtc_build_ssl) {
  deps += [ "//third_party/boringssl" ]
} else {

To:

if (rtc_build_ssl) {
  # deps += [ "//third_party/boringssl" ]
} else {

Comment out the following line in <WEBRTC_CHECKOUT_DIR>/src/third_party/usrsctp/usrsctplib/usrsctplib/user_environment.c:
```
#error Only BoringSSL is supported with SCTP_USE_OPENSSL_RAND
```

7. Set Up OpenSSL

Copy the openssl directory from <UNREAL_ENGINE_5.1.1_DIR>\Engine\Source\ThirdParty\OpenSSL\1.1.1n\include\Win64\VS2015 to the following locations:

<WEBRTC_CHECKOUT_DIR>\src\third_party\libsrtp\crypto\include
<WEBRTC_CHECKOUT_DIR>\src\third_party\usrsctp\usrsctplib\usrsctplib

Provide <UNREAL_ENGINE_5.1.1_DIR>\Engine\Source\ThirdParty\OpenSSL\1.1.1n\include\Win64\VS2015 when generating project files & compiling (next section).

H264 Codec (Optional, software codec)

Enable ffmpeg unsafe atomics

Go src\third_party\ffmpeg\ffmpeg_options.gni and set ffmpeg_use_unsafe_atomics to true or simply provide ffmpeg_use_unsafe_atomics=true to gn gen command (next section).

Patch code

TODO

Hardware accelerated h264 codec (ffmpeg nvenc)

TODO

Generating project files & Compiling

Compiling via Visual Studio 2019

Working solution for M96 (webrtc branch 4664):

// Note: h264 codec is not compiled as Unreal provides custom one (nvenc)
// non-clang is not tested!
// provide path to Unreal Engine 5.1 OpenSSL includes!
// Add PublicDefinitions.Add("DISABLE_H265=1") to WebRTC.Build.cs (Unreal Engine codebase)

gn gen  --ide=vs2019 out/release_no_h264 --args="target_winuwp_family=\"desktop\" is_component_build=false rtc_include_tests=false rtc_use_h264=false use_rtti=true enable_google_benchmarks=false rtc_disable_logging=true treat_warnings_as_errors=false is_clang=true rtc_include_ilbc=false use_custom_libcxx=false rtc_build_ssl=false is_debug=false rtc_enable_protobuf=false rtc_build_examples=false use_lld=false rtc_include_internal_audio_device=false rtc_builtin_ssl_root_certificates=false enable_libaom=false target_cpu=\"x64\" rtc_ssl_root=\"E:\mawari_workspace\UnrealEngine-5.1.1-release\Engine\Source\ThirdParty\OpenSSL\1.1.1n\include\Win64\VS2015\""

Compiling via Ninja: ninja -C out/release_no_h264

For h264 support:

gn gen  --ide=vs2019 out/Release_4664_h264_support_ffmpeg_unsafe_atomics --args="target_winuwp_family=\"desktop\" is_component_build=false rtc_include_tests=false rtc_use_h264=true ffmpeg_use_unsafe_atomics=true ffmpeg_branding=\"Chrome\"  use_rtti=true enable_google_benchmarks=false rtc_disable_logging=true treat_warnings_as_errors=false is_clang=true rtc_include_ilbc=false use_custom_libcxx=false rtc_build_ssl=false is_debug=false rtc_enable_protobuf=false rtc_build_examples=false use_lld=false rtc_include_internal_audio_device=false rtc_builtin_ssl_root_certificates=false enable_libaom=false target_cpu=\"x64\" rtc_ssl_root=\"E:\mawari_workspace\UnrealEngine-5.1.1-release\Engine\Source\ThirdParty\OpenSSL\1.1.1n\include\Win64\VS2015\""

Hint: Main cause of runtime errors (i.e. copy contructor/asssignment operator) -> Misalignment between size of VideoCodec structure in headers and compiled static library. Adding PublicDefinitions.Add("DISABLE_H265=1") to WebRTC.build.cs helped to resolve the runtime errors.

Now Unreal webrtc.lib file can be replaced with compiled one!

Work log (can be used as a reference)

gn gen --ide=vs2019 out/Release_4664_no_opus --args="use_rtti=true enable_iterator_debugging=true is_clang=false use_custom_libcxx=false libcxx_is_shared=true enable_libaom=false rtc_build_tools=false rtc_include_tests=false rtc_build_examples=false rtc_build_ssl=false is_debug=false rtc_enable_protobuf=false use_lld=false rtc_include_internal_audio_device=false target_cpu="x64" rtc_ssl_root="E:\mawari_workspace\UnrealEngine-5.1.1-release\Engine\Source\ThirdParty\OpenSSL\1.1.1n\include\Win64\VS2015""

symbol export & opus

gn gen --ide=vs2019 out/Release_4664_symbols_export --args="use_rtti=true enable_iterator_debugging=true is_clang=false rtc_include_opus=true rtc_build_opus=true rtc_enable_symbol_export=true rtc_enable_objc_symbol_export=false use_custom_libcxx=false libcxx_is_shared=true enable_libaom=false rtc_build_tools=false rtc_include_tests=false rtc_build_examples=false rtc_build_ssl=false is_debug=false rtc_enable_protobuf=false use_lld=false rtc_include_internal_audio_device=false target_cpu="x64" rtc_ssl_root="E:\mawari_workspace\UnrealEngine-5.1.1-release\Engine\Source\ThirdParty\OpenSSL\1.1.1n\include\Win64\VS2015""

latest (can link with source changes + abseil ones)

gn gen --ide=vs2019 out/Release_4664_no_pch --args="use_rtti=true enable_iterator_debugging=true is_clang=false rtc_include_opus=true rtc_build_opus=true enable_precompiled_headers=false use_custom_libcxx=false libcxx_is_shared=true enable_libaom=false rtc_build_tools=false rtc_include_tests=false rtc_build_examples=false rtc_build_ssl=false is_debug=false rtc_enable_protobuf=false use_lld=false rtc_include_internal_audio_device=false target_cpu="x64" rtc_ssl_root="E:\mawari_workspace\UnrealEngine-5.1.1-release\Engine\Source\ThirdParty\OpenSSL\1.1.1n\include\Win64\VS2015""

enable proprietary codecs (can link, runtime error, video codec access violation!)

gn gen --ide=vs2019 out/Release_4664_proprietary_codecs --args="use_rtti=true enable_iterator_debugging=true is_clang=false rtc_include_opus=true proprietary_codecs=true rtc_build_opus=true enable_precompiled_headers=false use_custom_libcxx=false libcxx_is_shared=true enable_libaom=false rtc_build_tools=false rtc_include_tests=false rtc_build_examples=false rtc_build_ssl=false rtc_builtin_ssl_root_certificates=false rtc_use_absl_mutex=true is_debug=false rtc_enable_protobuf=false use_lld=false rtc_include_internal_audio_device=false target_cpu="x64" rtc_ssl_root="E:\mawari_workspace\UnrealEngine-5.1.1-release\Engine\Source\ThirdParty\OpenSSL\1.1.1n\include\Win64\VS2015""

enable h264 (can link, runtime error, video codec access violation!)

gn gen --ide=vs2019 out/Release_4664_proprietary_codecs --args="use_rtti=true enable_iterator_debugging=true is_clang=false rtc_include_opus=true proprietary_codecs=true rtc_use_h264=true rtc_build_opus=true use_custom_libcxx=false libcxx_is_shared=true enable_libaom=false rtc_build_tools=false rtc_include_tests=false rtc_build_examples=false rtc_build_ssl=false rtc_builtin_ssl_root_certificates=false rtc_use_absl_mutex=true is_debug=false rtc_enable_protobuf=false use_lld=false rtc_include_internal_audio_device=false target_cpu="x64" rtc_ssl_root="E:\mawari_workspace\UnrealEngine-5.1.1-release\Engine\Source\ThirdParty\OpenSSL\1.1.1n\include\Win64\VS2015""

latest working 19.05 (still runtime error)

gn gen --ide=vs2019 out/Release_4664_h264_support_ffmpeg_unsafe_atomics --args="use_rtti=true enable_iterator_debugging=true is_clang=false rtc_include_opus=true proprietary_codecs=true rtc_use_h264=true rtc_build_opus=true use_custom_libcxx=false libcxx_is_shared=true enable_libaom=false rtc_build_tools=false rtc_include_tests=false rtc_build_examples=false rtc_build_ssl=false rtc_builtin_ssl_root_certificates=false rtc_use_absl_mutex=true is_debug=false rtc_enable_protobuf=false use_lld=false rtc_include_internal_audio_device=false target_cpu="x64" rtc_ssl_root="E:\mawari_workspace\UnrealEngine-5.1.1-release\Engine\Source\ThirdParty\OpenSSL\1.1.1n\include\Win64\VS2015""

test gn gen --ide=vs2019 out/Release_4664_test_flags --args="use_rtti=true is_clang=false rtc_include_opus=true proprietary_codecs=true rtc_use_h264=true rtc_build_opus=true use_custom_libcxx=false libcxx_is_shared=false enable_iterator_debugging=true enable_libaom=false rtc_build_tools=false rtc_include_tests=false rtc_include_pulse_audio=false rtc_include_ilbc=false rtc_build_examples=false rtc_build_ssl=false rtc_builtin_ssl_root_certificates=false rtc_use_absl_mutex=true is_debug=false rtc_enable_protobuf=false use_lld=false rtc_include_internal_audio_device=false target_cpu="x64" rtc_ssl_root="E:\mawari_workspace\UnrealEngine-5.1.1-release\Engine\Source\ThirdParty\OpenSSL\1.1.1n\include\Win64\VS2015""

Look into https://groups.google.com/g/discuss-webrtc/c/YZaNOPdWG2Y/m/6SSEV1OKCgAJ

Current errors (happened because of ABSL OPTIONS.h -> need to modify options.h to use absl implementations!

Go to third_party\abseil-cpp\absl\base\options.h and switch to use only absl implementations for EVERYTHING

8>Module.PixelStreaming.cpp.obj : error LNK2019: unresolved external symbol "public: static class absl::optional __cdecl webrtc::AudioDecoderOpus::SdpToConfig(struct webrtc::SdpAudioFormat const &)" (?SdpToConfig@AudioDecoderOpus@webrtc@@SA?AV?$optional@UConfig@AudioDecoderOpus@webrtc@@@absl@@AEBUSdpAudioFormat@2@@Z) referenced in function "public: virtual bool __cdecl webrtc::audio_decoder_factory_template_impl::AudioDecoderFactoryT::IsSupportedDecoder(struct webrtc::SdpAudioFormat const &)" (?IsSupportedDecoder@?$AudioDecoderFactoryT@UAudioDecoderOpus@webrtc@@@audio_decoder_factory_template_impl@webrtc@@UEAA_NAEBUSdpAudioFormat@3@@Z) 8>Module.PixelStreaming.cpp.obj : error LNK2019: unresolved external symbol "public: static class std::unique_ptr<class webrtc::AudioDecoder,struct std::default_delete > __cdecl webrtc::AudioDecoderOpus::MakeAudioDecoder(struct webrtc::AudioDecoderOpus::Config,class absl::optional)" (?MakeAudioDecoder@AudioDecoderOpus@webrtc@@SA?AV?$unique_ptr@VAudioDecoder@webrtc@@U?$default_delete@VAudioDecoder@webrtc@@@std@@@std@@UConfig@12@V?$optional@VAudioCodecPairId@webrtc@@@absl@@@Z) referenced in function "public: virtual class std::unique_ptr<class webrtc::AudioDecoder,struct std::default_delete > __cdecl webrtc::audio_decoder_factory_template_impl::AudioDecoderFactoryT::MakeAudioDecoder(struct webrtc::SdpAudioFormat const &,class absl::optional)" (?MakeAudioDecoder@?$AudioDecoderFactoryT@UAudioDecoderOpus@webrtc@@@audio_decoder_factory_template_impl@webrtc@@UEAA?AV?$unique_ptr@VAudioDecoder@webrtc@@U?$default_delete@VAudioDecoder@webrtc@@@std@@@std@@AEBUSdpAudioFormat@3@V?$optional@VAudioCodecPairId@webrtc@@@absl@@@Z) 8>Module.PixelStreaming.cpp.obj : error LNK2019: unresolved external symbol "public: static class absl::optional __cdecl webrtc::AudioEncoderOpus::SdpToConfig(struct webrtc::SdpAudioFormat const &)" (?SdpToConfig@AudioEncoderOpus@webrtc@@SA?AV?$optional@UAudioEncoderOpusConfig@webrtc@@@absl@@AEBUSdpAudioFormat@2@@Z) referenced in function "public: static class std::unique_ptr<class webrtc::AudioEncoder,struct std::default_delete > __cdecl webrtc::audio_encoder_factory_template_impl::Helper::MakeAudioEncoder(int,struct webrtc::SdpAudioFormat const &,class absl::optional)" (?MakeAudioEncoder@?$Helper@UAudioEncoderOpus@webrtc@@@audio_encoder_factory_template_impl@webrtc@@SA?AV?$unique_ptr@VAudioEncoder@webrtc@@U?$default_delete@VAudioEncoder@webrtc@@@std@@@std@@HAEBUSdpAudioFormat@3@V?$optional@VAudioCodecPairId@webrtc@@@absl@@@Z) 8>Module.PixelStreaming.cpp.obj : error LNK2019: unresolved external symbol "public: static class std::unique_ptr<class webrtc::AudioEncoder,struct std::default_delete > __cdecl webrtc::AudioEncoderOpus::MakeAudioEncoder(struct webrtc::AudioEncoderOpusConfig const &,int,class absl::optional)" (?MakeAudioEncoder@AudioEncoderOpus@webrtc@@SA?AV?$unique_ptr@VAudioEncoder@webrtc@@U?$default_delete@VAudioEncoder@webrtc@@@std@@@std@@AEBUAudioEncoderOpusConfig@2@HV?$optional@VAudioCodecPairId@webrtc@@@absl@@@Z) referenced in function "public: static class std::unique_ptr<class webrtc::AudioEncoder,struct std::default_delete > __cdecl webrtc::audio_encoder_factory_template_impl::Helper::MakeAudioEncoder(int,struct webrtc::SdpAudioFormat const &,class absl::optional)" (?MakeAudioEncoder@?$Helper@UAudioEncoderOpus@webrtc@@@audio_encoder_factory_template_impl@webrtc@@SA?AV?$unique_ptr@VAudioEncoder@webrtc@@U?$default_delete@VAudioEncoder@webrtc@@@std@@@std@@HAEBUSdpAudioFormat@3@V?$optional@VAudioCodecPairId@webrtc@@@absl@@@Z) 8>Module.PixelStreaming.cpp.obj : error LNK2019: unresolved external symbol "class absl::optional<class std::basic_string<char,struct std::char_traits,class std::allocator > > __cdecl webrtc::H264ProfileLevelIdToString(struct webrtc::H264ProfileLevelId const &)" (?H264ProfileLevelIdToString@webrtc@@YA?AV?$optional@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@absl@@AEBUH264ProfileLevelId@1@@Z) referenced in function "struct webrtc::SdpVideoFormat __cdecl UE::PixelStreaming::CreateH264Format(enum webrtc::H264Profile,enum webrtc::H264Level)" (?CreateH264Format@PixelStreaming@UE@@YA?AUSdpVideoFormat@webrtc@@W4H264Profile@4@W4H264Level@4@@Z) 8>Module.PixelStreaming.cpp.obj : error LNK2019: unresolved external symbol "bool __cdecl absl::EqualsIgnoreCase(class absl::string_view,class absl::string_view)" (?EqualsIgnoreCase@absl@@YA_NVstring_view@1@0@Z) referenced in function "public: virtual class std::unique_ptr<class webrtc::VideoDecoder,struct std::default_delete > __cdecl UE::PixelStreaming::FVideoDecoderFactory::CreateVideoDecoder(struct webrtc::SdpVideoFormat const &)" (?CreateVideoDecoder@FVideoDecoderFactory@PixelStreaming@UE@@UEAA?AV?$unique_ptr@VVideoDecoder@webrtc@@U?$default_delete@VVideoDecoder@webrtc@@@std@@@std@@AEBUSdpVideoFormat@webrtc@@@Z)

COMMENT OUT!!! third_party/usrsctp/usrsctplib/usrsctplib/ -> ../../third_party/usrsctp/usrsctplib/usrsctplib/user_environment.c(102,2): error: Only BoringSSL is supported with SCTP_USE_OPENSSL_RAND. #error Only BoringSSL is supported with SCTP_USE_OPENSSL_RAND

Enable ffmpeg unsafe atomics (IMPORTANT)!!! Only if H264 codec is required!

WORKING COMPILATION VIA CLANG for 4884

TODO: Need to include h264 and proprietary codecs??? NO need to include h264 as Unreal provides its own implementation

E:\mawari_workspace\depot_tools\webrtc_checkout_4844\src>gn gen out/release_no_boringssl --args="target_winuwp_family="desktop" is_component_build=false rtc_include_tests=false rtc_use_h264=true use_rtti=true treat_warnings_as_errors=false is_clang=true use_custom_libcxx=false rtc_build_ssl=false is_debug=false rtc_enable_protobuf=false rtc_build_examples=false use_lld=false rtc_include_internal_audio_device=false rtc_builtin_ssl_root_certificates=false enable_libaom=false target_cpu="x64" rtc_ssl_root="E:\mawari_workspace\UnrealEngine-5.1.1-release\Engine\Source\ThirdParty\OpenSSL\1.1.1n\include\Win64\VS2015""

M96

E:\mawari_workspace\depot_tools\webrtc_checkout\src>gn gen out/release_test --filters=//:webrtc --args="is_component_build=false rtc_include_tests=false rtc_include_ilbc=false use_rtti=true enable_google_benchmarks=false treat_warnings_as_errors=false enable_iterator_debugging=false use_custom_libcxx=false libcxx_is_shared=true rtc_build_ssl=false is_debug=false rtc_enable_protobuf=false rtc_build_examples=false use_lld=false rtc_include_internal_audio_device=false rtc_builtin_ssl_root_certificates=false enable_libaom=false target_cpu="x64" rtc_ssl_root="E:\mawari_workspace\UnrealEngine-5.1.1-release\Engine\Source\ThirdParty\OpenSSL\1.1.1n\include\Win64\VS2015""

M96 (clang true)

gn gen out/release_test --filters=//:webrtc --args="is_component_build=false rtc_include_tests=false rtc_include_ilbc=false use_rtti=true rtc_use_h264=true proprietary_codecs=true enable_google_benchmarks=false treat_warnings_as_errors=false enable_iterator_debugging=false use_custom_libcxx=false libcxx_is_shared=true rtc_build_ssl=false is_debug=false rtc_enable_protobuf=false rtc_build_examples=false use_lld=false rtc_include_internal_audio_device=false rtc_builtin_ssl_root_certificates=false enable_libaom=false target_cpu="x64" rtc_ssl_root="E:\mawari_workspace\UnrealEngine-5.1.1-release\Engine\Source\ThirdParty\OpenSSL\1.1.1n\include\Win64\VS2015""

Name		Name	Last commit message	Last commit date
Latest commit History 28 Commits
LICENSE		LICENSE
README.md		README.md
webrtc-how-to-build-old.txt		webrtc-how-to-build-old.txt
webrtc.lib		webrtc.lib

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Windows-specific WebRTC build instructions

Install Ninja

Create working directory

Clone webrtc

Generating & compiling project

Patch the Code (to use webrtc.lib in Unreal)

1. Copy WebRTC includes

2. WebRTC codebase fixes

3. Patch webrtc BUILD.gn

4. Modify compiler switches:

5. Modify abseil-cpp

6. Exclude BoringSSL

7. Set Up OpenSSL

H264 Codec (Optional, software codec)

Enable ffmpeg unsafe atomics

Patch code

Hardware accelerated h264 codec (ffmpeg nvenc)

Generating project files & Compiling

Compiling via Visual Studio 2019

Work log (can be used as a reference)

symbol export & opus

latest (can link with source changes + abseil ones)

enable proprietary codecs (can link, runtime error, video codec access violation!)

enable h264 (can link, runtime error, video codec access violation!)

latest working 19.05 (still runtime error)

Current errors (happened because of ABSL OPTIONS.h -> need to modify options.h to use absl implementations!

Go to third_party\abseil-cpp\absl\base\options.h and switch to use only absl implementations for EVERYTHING

Enable ffmpeg unsafe atomics (IMPORTANT)!!! Only if H264 codec is required!

WORKING COMPILATION VIA CLANG for 4884

M96

M96 (clang true)

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Windows-specific WebRTC build instructions

Install Ninja

Create working directory

Clone webrtc

Generating & compiling project

Patch the Code (to use webrtc.lib in Unreal)

1. Copy WebRTC includes

2. WebRTC codebase fixes

3. Patch webrtc BUILD.gn

4. Modify compiler switches:

5. Modify abseil-cpp

6. Exclude BoringSSL

7. Set Up OpenSSL

H264 Codec (Optional, software codec)

Enable ffmpeg unsafe atomics

Patch code

Hardware accelerated h264 codec (ffmpeg nvenc)

Generating project files & Compiling

Compiling via Visual Studio 2019

Work log (can be used as a reference)

symbol export & opus

latest (can link with source changes + abseil ones)

enable proprietary codecs (can link, runtime error, video codec access violation!)

enable h264 (can link, runtime error, video codec access violation!)

latest working 19.05 (still runtime error)

Current errors (happened because of ABSL OPTIONS.h -> need to modify options.h to use absl implementations!

Go to third_party\abseil-cpp\absl\base\options.h and switch to use only absl implementations for EVERYTHING

Enable ffmpeg unsafe atomics (IMPORTANT)!!! Only if H264 codec is required!

WORKING COMPILATION VIA CLANG for 4884

M96

M96 (clang true)

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