关于 ffmpeg 中的 h264_qsv 编码速度

编程问答 2022-08-07

问题描述

众所周知，现在 ffmpeg 支持 intel 硬件编码（h264 qsv）。 但是不支持“超快”，有没有什么设置可以提高编码速度？

m_encoder = avcodec_find_encoder_by_name("h264_qsv");
if(m_encoder == nullptr){
    LOG(ERROR)<<"Find H264 Encoder Failed";
    return false;
}
m_ctx = avcodec_alloc_context3(m_encoder);
m_ctx->bit_rate = bitrate_kbps*1024;
m_ctx->width = m_width;
m_ctx->height = m_height;
m_ctx->time_base = { 1,(int)fps };
m_ctx->qmin = 10;
m_ctx->qmax = 35;
m_ctx->gop_size = fps;
m_ctx->max_b_frames = 0;
m_ctx->has_b_frames = false;

m_ctx->codec_id = m_encoder->id;
m_ctx->codec_type = AVMEDIA_TYPE_VIDEO;
m_ctx->pix_fmt = m_h264InputFormat;

AVDictionary *param = nullptr;
av_dict_set(&param,"look_ahead","0",0);
av_dict_set(&param,"look_ahead_depth","8","preset","veryfast","tune","zerolatency",0);

int ret = avcodec_open2(m_ctx,m_encoder,&param);

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