avcodec_register_all();

        ctx = avformat_alloc_context();
        encoder = avcodec_find_encoder(AV_CODEC_ID_H264);
        stream = avformat_new_stream(ctx, encoder);
        frame = avcodec_alloc_frame();
        rframe = avcodec_alloc_frame();

        avcodec_get_context_defaults3(stream->codec, encoder);

        stream->codec->pix_fmt = AV_PIX_FMT_RGB32;
        stream->codec->width = 192;
        stream->codec->height = 158;

        swsCtx = sws_getContext(stream->codec->width,
                                stream->codec->height,
                                AV_PIX_FMT_RGB32,
                                stream->codec->width,
                                stream->codec->height,
                                SWS_BICUBIC,
                                stream->codec->pix_fmt,
                                nil, nil, nil);