- execlp("ffmpeg", "ffmpeg", "-i", filename.c_str(), "-an", "-f", "image2pipe", "-vcodec", "ppm", "-", (const char *)NULL);
+ string time = strprintf("00:00:00.%d",frame);
+ execlp("ffmpeg", "ffmpeg", "-ss", time.c_str(), "-i", filename.c_str(), "-an", "-f", "image2pipe", "-vcodec", "ppm", "-", (const char *)NULL);