X264 라이브러리를 이용한 h.264 인코딩

1) x264_param_t 파라미터 설정

x264_param_t param;
 

x264_param_default_preset(&param, "veryfast", "zerolatency");

param.i_threads = 1;

param.i_width = width;

param.i_height = height;

param.i_fps_num = fps;

param.i_fps_den = 1;

// Intra refres:

param.i_keyint_max = fps;

param.b_intra_refresh = 1;

//Rate control:

param.rc.i_rc_method = X264_RC_CRF;

param.rc.f_rf_constant = 25;

param.rc.f_rf_constant_max = 35;

//For streaming:

param.b_repeat_headers = 1;

param.b_annexb = 1;

x264_param_apply_profile(&param, "baseline");

 
2) 인코더 초기화 

x264_t* encoder = x264_encoder_open(&param);

x264_picture_t pic_in, pic_out;

x264_picture_alloc(&pic_in, X264_CSP_I420, w, h)

 
3) 인코딩 처리 

//data is a pointer to you RGB structure

int srcstride = w*3; //RGB stride is just 3*width

sws_scale(convertCtx, &data, &srcstride, 0, h, pic_in.img.plane, pic_in.img.stride);

x264_nal_t* nals;

int i_nals;

int frame_size = x264_encoder_encode(encoder, &nals, &i_nals, &pic_in, &pic_out);

if (frame_size >= 0)

{

    // OK

}