linux

FFmpegKit for Linux

1. Features

• Provides a C++ API with c++11
• Includes x86_64 architecture
• Builds shared native libraries (.so)
• Prebuilt binaries not published

2. Building

Run linux.sh at project root directory to build ffmpeg-kit and ffmpeg shared libraries.

Please note that FFmpegKit project repository includes the source code of FFmpegKit only. linux.sh needs network connectivity and internet access to github.com in order to download the source code of FFmpeg and external libraries enabled.

2.1 Prerequisites

linux.sh requires the following packages.

2.1.1 Packages

Use your package manager (apt, yum, dnf, etc.) to install the following packages.

Note that the names of the Linux packages vary from distribution to distribution. The names given below are valid for Debian/Ubuntu. Some packages may have a different name if you are on another distribution.

• The following packages are required by the build scripts.

  clang llvm lld libclang-14-dev libstdc++6 nasm autoconf automake libtool pkg-config curl git doxygen rapidjson-dev
  

• These optional packages should be installed only if you want to build corresponding external libraries.

  cmake libasound2-dev libass-dev libfontconfig1-dev libfreetype-dev libfribidi-dev libgmp-dev libgnutls28-dev libmp3lame-dev libopencore-amrnb-dev libopencore-amrwb-dev libopus-dev librubberband-dev libsdl2-dev libshine-dev libsnappy-dev libsoxr-dev libspeex-dev libtesseract-dev libtheora-dev libtwolame-dev libva-dev libvidstab-dev libvorbis-dev libvo-amrwbenc-dev libvpx-dev libv4l-dev libwebp-dev libxml2-dev libxvidcore-dev libx265-dev meson ocl-icd-opencl-dev opencl-headers tcl zlib1g-dev groff gtk-doc-tools libtasn1
  

2.2 Options

Use --enable-<library name> flag to support additional external or system libraries.

./linux.sh --enable-fontconfig

Run --help to see all available build options.

2.3 Build Output

All libraries created by linux.sh can be found under the prebuilt directory.

• Headers and libraries created for the Main builds are located under the bundle-linux folder.

3. Using

3.1 C++ API

FFmpegKit doesn't publish any prebuilt Linux libraries, as it does for other platforms. Therefore, you need to manually build and import FFmpegKit libraries into your projects.

Then, you can use the following API methods to execute FFmpeg and FFprobe commands inside your application.

1. Execute synchronous FFmpeg commands.

   #include <FFmpegKit.h>
   #include <FFmpegKitConfig.h>
   
   using namespace ffmpegkit;
   
   auto session = FFmpegKit::execute("-i file1.mp4 -c:v mpeg4 file2.mp4");
   if (ReturnCode::isSuccess(session->getReturnCode())) {
   
       // SUCCESS
   
   } else if (ReturnCode::isCancel(session->getReturnCode())) {
   
       // CANCEL
   
   } else {
   
       // FAILURE
       std::cout << "Command failed with state " << FFmpegKitConfig::sessionStateToString(session->getState()) << " and rc " << session->getReturnCode() << "." << session->getFailStackTrace() << std::endl;
   
   }

2. Each execute call (sync or async) creates a new session. Access every detail about your execution from the session created.

   #include <FFmpegKit.h>
   #include <FFmpegKitConfig.h>
   
   using namespace ffmpegkit;
   
   auto session = FFmpegKit::execute("-i file1.mp4 -c:v mpeg4 file2.mp4");
   
   // Unique session id created for this execution
   long sessionId = session->getSessionId();
   
   // Command arguments as a single string
   auto command = session->getCommand();
   
   // Command arguments
   auto arguments = session->getArguments();
   
   // State of the execution. Shows whether it is still running or completed
   SessionState state = session->getState();
   
   // Return code for completed sessions. Will be null if session is still running or ends with a failure
   auto returnCode = session->getReturnCode();
   
   auto startTime = session->getStartTime();
   auto endTime = session->getEndTime();
   long duration = session->getDuration();
   
   // Console output generated for this execution
   auto output = session->getOutput();
   
   // The stack trace if FFmpegKit fails to run a command
   auto failStackTrace = session->getFailStackTrace();
   
   // The list of logs generated for this execution
   auto logs = session->getLogs();
   
   // The list of statistics generated for this execution
   auto statistics = session->getStatistics();

3. Execute asynchronous FFmpeg commands by providing session specific execute/log/session callbacks.

   #include <FFmpegKit.h>
   #include <FFmpegKitConfig.h>
   
   using namespace ffmpegkit;
   
   FFmpegKit::executeAsync("-i file1.mp4 -c:v mpeg4 file2.mp4", [](auto session) {
       const auto state = session->getState();
       auto returnCode = session->getReturnCode();
   
       // CALLED WHEN SESSION IS EXECUTED
   
       std::cout << "FFmpeg process exited with state " << FFmpegKitConfig::sessionStateToString(state) << " and rc " << returnCode << "." << session->getFailStackTrace() << std::endl;
   }, [](auto log) {
   
       // CALLED WHEN SESSION PRINTS LOGS
   
   }, [](auto statistics) {
   
       // CALLED WHEN SESSION GENERATES STATISTICS
   
   });

4. Execute FFprobe commands.

   • Synchronous

   #include <FFprobeKit.h>
   #include <FFmpegKitConfig.h>
   
   using namespace ffmpegkit;
   
   auto session = FFprobeKit::execute(ffprobeCommand);
   
   if (!ReturnCode::isSuccess(session->getReturnCode())) {
       std::cout << "Command failed. Please check output for the details." << std::endl;
   }

   • Asynchronous

   #include <FFprobeKit.h>
   #include <FFmpegKitConfig.h>
   
   using namespace ffmpegkit;
   
   FFprobeKit::executeAsync(ffprobeCommand, [](auto session) {
   
       // CALLED WHEN SESSION IS EXECUTED
   
   });

5. Get media information for a file.

   #include <FFprobeKit.h>
   
   using namespace ffmpegkit;
   
   auto mediaInformation = FFprobeKit::getMediaInformation("<file path or uri>");
   mediaInformation->getMediaInformation();

6. Stop ongoing FFmpeg operations.

   • Stop all executions

     FFmpegKit::cancel();

   • Stop a specific session

     FFmpegKit::cancel(sessionId);

7. Get previous FFmpeg and FFprobe sessions from session history.

   #include <FFmpegKitConfig.h>
   
   using namespace ffmpegkit;
   
   auto sessions = FFmpegKitConfig::getSessions();
   int i = 0;
   std::for_each(sessions->begin(), sessions->end(), [](const auto session) {
       std::cout << "Session " << i++ << " = id:" << session->getSessionId() << ", startTime:" << session->getStartTime() << ", duration:" << session-> getDuration() << ", state:" << FFmpegKitConfig::sessionStateToString(session->getState()) << ", returnCode:" << session->getReturnCode() << "." << std::endl;
   });

8. Enable global callbacks.

   • Session type specific Complete Callbacks, called when an async session has been completed

     #include <FFmpegKitConfig.h>
     
     using namespace ffmpegkit;
     
     FFmpegKitConfig::enableFFmpegSessionCompleteCallback([](auto session) {
     
     });
     
     FFmpegKitConfig::enableFFprobeSessionCompleteCallback([](auto session) {
     
     });
     
     FFmpegKitConfig::enableMediaInformationSessionCompleteCallback([](auto session) {
     
     });

   • Log Callback, called when a session generates logs

     #include <FFmpegKitConfig.h>
     
     using namespace ffmpegkit;
     
     FFmpegKitConfig::enableLogCallback([](auto log) {
         ...
     });

   • Statistics Callback, called when a session generates statistics

     #include <FFmpegKitConfig.h>
     
     using namespace ffmpegkit;
     
     FFmpegKitConfig::enableStatisticsCallback([](auto statistics) {
         ...
     });

9. Register system fonts and custom font directories.

   #include <FFmpegKitConfig.h>
   
   using namespace ffmpegkit;
   
   FFmpegKitConfig::setFontDirectoryList(std::list<std::string>{"/usr/share/fonts"}, std::map<std::string,std::string>()));

4. Test Application

You can see how FFmpegKit is used inside an application by running Linux test applications developed under the FFmpegKit Test project.