I use ffmpeg to encode picture to video stream. After I send this stream to RTP
protocol. How I can set NAL units size. Here's my codec settings:
pAVCodecCtxEncode = avcodec_alloc_context();
AVCodec* codecE = avcodec_find_encoder(CODEC_ID_H264);
if (!codecE)
{
return ; // Didn't find a video stream
}
if(codecE->capabilities & CODEC_CAP_TRUNCATED)
pAVCodecCtxEncode->flags|= CODEC_FLAG_TRUNCATED;
avcodec_get_context_defaults2(pAVCodecCtxEncode, CODEC_TYPE_VIDEO);
// set codec id
pAVCodecCtxEncode->codec_id = CODEC_ID_H264;
pAVCodecCtxEncode->coder_type = 1;
pAVCodecCtxEncode->thread_count = 3;
// put bitrate parameters
pAVCodecCtxEncode->bit_rate = 90000;
pAVCodecCtxEncode->bit_rate_tolerance = 90000;
// put width and height
pAVCodecCtxEncode->width = 192;
pAVCodecCtxEncode->height = 144;
// set frame rate
pAVCodecCtxEncode->time_base.den = 5;
pAVCodecCtxEncode->time_base.num = 1;
// set pixel format
pAVCodecCtxEncode->pix_fmt = PIX_FMT_YUV420P;
pAVCodecCtxEncode->gop_size = 15;
pAVCodecCtxEncode->keyint_min = 15;
pAVCodecCtxEncode->b_frame_strategy = 1;
pAVCodecCtxEncode->max_b_frames = 300;
pAVCodecCtxEncode->max_b_frames = 300;
pAVCodecCtxEncode->qblur = 0.5;
pAVCodecCtxEncode->qcompress = 0.5;
pAVCodecCtxEncode->b_quant_offset = 1.25;
pAVCodecCtxEncode->b_quant_factor = 1.25;
pAVCodecCtxEncode->i_quant_offset = 0.0;
pAVCodecCtxEncode->i_quant_factor = -0.71f;
pAVCodecCtxEncode->mb_qmax = pAVCodecCtxEncode->qmax = 0.2;
pAVCodecCtxEncode->mb_qmin = pAVCodecCtxEncode->qmin = 0;
pAVCodecCtxEncode->max_qdiff = 0;
// motion estimation range
pAVCodecCtxEncode->me_range = 0;
pAVCodecCtxEncode->error_concealment = 3;
pAVCodecCtxEncode->error_recognition = 1;
// pAVCodecCtxEncode->rtp_mode= 1;
pAVCodecCtxEncode->rtp_payload_size= 650;
if (avcodec_open(pAVCodecCtxEncode, codecE) < 0){
return ;
}
Changing this "pAVCodecCtxEncode->rtp_payload_size " setting does nothing.
This I encode frame:
int outbuf_size = avpicture_get_size(pAVCodecCtxEncode->pix_fmt, w, h);
uint8_t *outbuf = (uint8_t*)av_malloc(outbuf_size);
AVFrame *packet = avcodec_alloc_frame();
packet->data[0] = (uint8_t*)Y.bytes;
packet->data[1] = (uint8_t*)V.bytes;
packet->data[2] = (uint8_t*)U.bytes;
packet->data[3] = NULL;
packet->linesize[0] = w;
packet->linesize[1] = w/2;
packet->linesize[2] = w/2;
packet->linesize[3] = 0;
pAVCodecCtxEncode->rtp_payload_size = 500;
int out_size = avcodec_encode_video(pAVCodecCtxEncode, outbuf,
outbuf_size, packet);
When I get a buffer, I'm looking for 0x0000001 and is divided into NAL units.
The size of them receive more. How can I manage it?
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