yinyong02 / hi3521dv100-

H264 stream RTP codec

Hi3521DV100

720p camera used. H264BSAnalyzer is recommeded to analyse the coded H264 file

1. H264 stream process:

Open sample_vio.c; The main process flowVI->VENC->VPSS->VDEC->VO

2. Hi3521 Performance compared with Intel QSV, KungPeng920

command: QSVEncC64 --fps 25 --input-res 1280x720 --qvbr 1040 -i "AVBR.yuv" -o "AVBR.h264"

dependency: Intel HD Graphics 520；Media SDK Hardware API v1.19；QSVEnc 3.33

command: ffmpeg -f rawvideo -pix_fmt yuv420p -s 1280x720 -r 25 -i 6_AVBR.yuv -c:v libx264 -f rawvideo out2_AVBR.h264

dependency: ffmpeg4.2.1；x264 ENClibrary

Result:

The H264 encoding done by ffmpeg on the Kunpeng 920 differs from the frame structure of the Hi3521 encoded file, firstly, its entropy encoding method is CABAC, the bit rate of CABAC saves 5%-14% compared to CAVLC, and the bit rate saving increases with the increase of quantization step. its computational resource consumption is acceptable on server-level CPUs.

Kunpeng 920

Hi3521

GPU encoding provides separate image information PPS and SEI for each frame's pixel matrix, thanks to its suitability for computationally intensive tasks, but because of the low performance of control-intensive tasks during video encoding (slow exchange between GPU and computer main memory), QSV also does not make the work pipeline between CPU and GPU. it shows low performance of control-intensive tasks in the video encoding process.

QSV

3. H264toRTPsend / RTPtoH264recv:

send command: ./send_h264file_rtp -t|u [send via tcp(default) or udp] [h264filename] [IP]127.0.0.1 [PORT]1234

recv command: ./recv [save filename] [PORT]