Have a nice day to you, people!
I am writing an application for Windows that will capture the screen and send the stream to Wowza server by rtmp (for broadcasting). My application use ffmpeg and Qt. I capture the screen with WinApi, convert a buffer to YUV444(because it's simplest) and encode frame as described at the file decoding_encoding.c (from FFmpeg examples):
///////////////////////////
//Encoder initialization
///////////////////////////
avcodec_register_all();
codec=avcodec_find_encoder(AV_CODEC_ID_H264);
c = avcodec_alloc_context3(codec);
c->width=scr_width;
c->height=scr_height;
c->bit_rate = 400000;
int base_num=1;
int base_den=1;//for one frame per second
c->time_base= (AVRational){base_num,base_den};
c->gop_size = 10;
c->max_b_frames=1;
c->pix_fmt = AV_PIX_FMT_YUV444P;
av_opt_set(c->priv_data, "preset", "slow", 0);
frame = avcodec_alloc_frame();
frame->format = c->pix_fmt;
frame->width = c->width;
frame->height = c->height;
for(int counter=0;counter<10;counter++)
{
///////////////////////////
//Capturing Screen
///////////////////////////
GetCapScr(shotbuf,scr_width,scr_height);//result: shotbuf is filled by screendata from HBITMAP
///////////////////////////
//Convert buffer to YUV444 (standard formula)
//It's handmade function because of problems with prepare buffer to swscale from HBITMAP
///////////////////////////
RGBtoYUV(shotbuf,frame->linesize,frame->data,scr_width,scr_height);//result in frame->data
///////////////////////////
//Encode Screenshot
///////////////////////////
av_init_packet(&pkt);
pkt.data = NULL; // packet data will be allocated by the encoder
pkt.size = 0;
frame->pts = counter;
avcodec_encode_video2(c, &pkt, frame, &got_output);
if (got_output)
{
//I think that sending packet by rtmp must be here!
av_free_packet(&pkt);
}
}
// Get the delayed frames
for (int got_output = 1,i=0; got_output; i++)
{
ret = avcodec_encode_video2(c, &pkt, NULL, &got_output);
if (ret < 0)
{
fprintf(stderr, "Error encoding frame\n");
exit(1);
}
if (got_output)
{
//I think that sending packet by rtmp must be here!
av_free_packet(&pkt);
}
}
///////////////////////////
//Deinitialize encoder
///////////////////////////
avcodec_close(c);
av_free(c);
av_freep(&frame->data[0]);
avcodec_free_frame(&frame);
I need to send video stream generated by this code to RTMP server. In other words, I need c++/c analog for this command:
ffmpeg -re -i "sample.h264" -f flv rtmp://sample.url.com/screen/test_stream
It's useful, but I don't want to save stream to file, I want to use ffmpeg libraries for realtime encoding screen capture and sending encoded frames to RTMP server inside my own application. Please give me a little example how to initialize AVFormatContext properly and to send my encoded video AVPackets to server.
Thanks.