encoder->Initialize(¶m); OpenH264 expects YUV 4:2:0. Convert your frame buffer:
std::deque<std::vector<uint8_t>> replay_buffer; // On kill: std::ofstream replay("killcam_replay.h264", std::ios::binary); for (auto& nal : replay_buffer) replay.write((char*)nal.data(), nal.size()); the killer's game openh264
make OS=windows ARCH=x86_64 Link libopenh264.dll or static .lib into your game engine. #include "codec_api.h" ISVCEncoder* encoder = nullptr; WelsCreateSVCEncoder(&encoder); encoder->Initialize(¶m); OpenH264 expects YUV 4:2:0
uint8_t* h264_stream = ...; // read from file uint8_t* yuv_out = new uint8_t[width height 3/2]; decoder->DecodeFrameNoDelay(h264_stream, stream_len, yuv_out); U/V planes
// Assuming game gives you RGB24 void RGB24toYUV420(uint8_t* rgb, uint8_t* yuv, int width, int height) // Standard conversion matrix (BT.601) for (int i = 0; i < width * height; i++) int r = rgb[3*i]; int g = rgb[3*i+1]; int b = rgb[3*i+2]; yuv[i] = (66*r + 129*g + 25*b + 128)>>8 + 16; // Y // ... U/V planes