Roofman Libvpx ⟶ <Original>

// For each frame (img in I420) vpx_codec_encode(&codec, img, pts, 1, flags, VPX_DL_GOOD_QUALITY); vpx_codec_iter_t iter = NULL; const vpx_codec_cx_pkt_t *pkt; while ((pkt = vpx_codec_get_cx_data(&codec, &iter))) if (pkt->kind == VPX_CODEC_CX_FRAME_PKT) fwrite(pkt->data.frame.buf, 1, pkt->data.frame.sz, outfile);

cfg.g_pass = VPX_RC_ONE_PASS; cfg.rc_end_usage = VPX_CBR; cfg.g_lag_in_frames = 0; // no lookahead cfg.rc_min_quantizer = 2; // allow high quality if bandwidth permits cfg.rc_max_quantizer = 56; vpx_codec_enc_config_set(&codec, &cfg); vpx_codec_control(&codec, VP8E_SET_CPUUSED, 8); vpx_codec_control(&codec, VP9E_SET_TILE_COLUMNS, 2); // 2^2 = 4 tiles 6. Alternatives & When Not to Use libvpx | Scenario | Better choice | |----------|----------------| | Need H.264 hardware encoder | x264, NVENC, VAAPI | | Ultra‑low bitrate (<300 kbps for 720p) | AV1 (libaom, SVT‑AV1) | | Lossless / near‑lossless archival | FFV1, x265 lossless | | Legacy compatibility (old phones) | H.264 (x264) | | GPU‑accelerated encoding | NVENC, AMF, Intel QSV | roofman libvpx