Video Generator

The "Video Generator" was created to test long running video and audio encoders and video/audio sync. It can generate a continous stream of YUV420P video frames with a 44100hz, int16 2 channel audio signal.

See video_generator.h for a description on how to use it or take a look at the example.c file which contains a basic example of how to use the video generator to generate an video and audio signal.

The generated video contains 7 vertical bars and 1 horizontal scrolling one. The horizontal bar moves from to to bottom every 5 seconds. In the center of the video you see a black rectangle which displays the time. This time is based on the number of generated frames and framerate. It's up to the user to generate enough frames to have a stable framerate.

Compiling

You can either just include the video_generator.c file in your project or use the accompanying CMakeLists.txt and release.sh files. If you want to make use of cmake, make sure that you've installed it.

On Mac, Linux and Windows use the following. For windows users, make sure to execute the ./release.sh script using a Git Bash shell.

cd build
./release.sh

The example is installed into install/[system-triplet]/bin/.

Example

fp = fopen("output.yuv", "wb");

video_generator gen;
video_geneator_settings cfg;

cfg.width = WIDTH;
cfg.height = HEIGHT;
cfg.fps = FPS;

if (0 != video_generator_init(&cfg, &gen)) {
  printf("Error: cannot initialize the generator.\n");
  exit(1);
}

while(1) {

   printf("Frame: %llu\n", gen.frame);

   video_generator_update(&gen);

   // write video planes to a file
   fwrite((char*)gen.y, gen.ybytes,1,  fp);
   fwrite((char*)gen.u, gen.ubytes,1, fp);
   fwrite((char*)gen.v, gen.vbytes,1, fp);

   if (gen.frame > 250) { 
     break;
   }

   usleep(gen.fps);
}

fclose(fp);

video_generator_clear(&gen);