测试发现同一视频源MP4文件，经过硬编码设置小的分辨率会比设置大的分辨率，编码后得到的文件大小大 · Pull Request !1284 · Ascend/samples

经测试，采用原始视频MP4文件：时长：5分钟，文件大小15.2M ，分辨率：1280*848 ,码率：384，帧率：23
编码后MP4文件：时长5分钟，文件大小8.54M , 分辨率：864*480，码率：192，帧率：23。 关键帧间隔250
编码后MP4文件：时长5分钟，文件大小5.12M , 分辨率：1280*720，码率：192，帧率：23，  关键帧间隔250

经以上数据得出的结果为1280*720编码后的文件大小为5.12M,而864*480编码后的文件大小为8.54M
分辨率大的编码后的文件相对分辨率小的编码后的文件大，不知道原因是什么？请帮忙协议测试一下，是否会出现同样的问题

下面为具体的环境配置如下：
驱动：A300-3000-3010-npu-driver_20.2.0_centos7.6-aarch64.run
固件：A300-3000-3010-npu-firmware_1.76.22.3.220.run
toolkit：Ascend-cann-toolkit_20.2.rc1_linux-aarch64.run

关键性代码如下
 // venc init
  m_vencChannelDesc = aclvencCreateChannelDesc();
  if (m_vencChannelDesc == nullptr) {
    std::printf("[%s][%d][chn:%d] aclvencCreateChannelDesc failed \n",
                __FUNCTION__, __LINE__, m_channelId);

return -1;
  }
  ret = aclvencSetChannelDescThreadId(m_vencChannelDesc, dvppthreadId);
  if (ret != ACL_ERROR_NONE) {
    std::printf("[%s][%d][chn:%d] aclvencSetChannelDescThreadId failed, "
                "errorCode[%d]\n",
                __FUNCTION__, __LINE__, m_channelId, ret);
    return -1;
  }
  ret = aclvencSetChannelDescCallback(m_vencChannelDesc, &VencCallbackFunc);
  if (ret != ACL_ERROR_NONE) {
    std::printf("[%s][%d][chn:%d] aclvencSetChannelDescCallback failed, "
                "errorCode[%d]\n",
                __FUNCTION__, __LINE__, m_channelId, ret);
    return -1;
  }
  ret = aclvencSetChannelDescEnType(m_vencChannelDesc, m_dvppStreamFormat);
  if (ret != ACL_ERROR_NONE) {
    std::printf(
        "[%s][%d][chn:%d] aclvencSetChannelDescEnType failed, errorCode[%d]\n",
        __FUNCTION__, __LINE__, m_channelId, ret);

return -1;
  }
  ret = aclvencSetChannelDescPicFormat(m_vencChannelDesc, m_dvppPixelFormat);
  if (ret != ACL_ERROR_NONE) {
    std::printf("[%s][%d][chn:%d] aclvencSetChannelDescPicFormat failed, "
                "errorCode[%d]\n",
                __FUNCTION__, __LINE__, m_channelId, ret);
    return -1;
  }
  ret = aclvencSetChannelDescPicWidth(m_vencChannelDesc, m_outputWidth);
  if (ret != ACL_ERROR_NONE) {
    std::printf("[%s][%d][chn:%d] aclvencSetChannelDescPicWidth failed, "
                "errorCode[%d]\n",
                __FUNCTION__, __LINE__, m_channelId, ret);
    return -1;
  }
  ret = aclvencSetChannelDescPicHeight(m_vencChannelDesc, m_outputHeight);
  if (ret != ACL_ERROR_NONE) {
    std::printf("[%s][%d][chn:%d] aclvencSetChannelDescPicHeight failed, "
                "errorCode[%d]\n",
                __FUNCTION__, __LINE__, m_channelId, ret);

return -1;
  }
  // 帧率,fps,[1,120]
  ret = aclvencSetChannelDescSrcRate(m_vencChannelDesc, m_outputFps);
  if (ret != ACL_ERROR_NONE) {
    std::printf("[%s][%d][chn:%d] aclvencSetChannelDescSrcRate "
                "failed, errorCode[%d]\n",
                __FUNCTION__, __LINE__, m_channelId, ret);

logPrint.W(__FUNCTION__, __LINE__, YLog::ERR, "aclvencSetChannelDescSrcRate failed, errorCode", ret);
    return -1;
  }
  // 码率,kbps,[10,30000]
  aclvencSetChannelDescMaxBitRate(m_vencChannelDesc, m_outputMaxBitRate);

// 关键帧间隔[1,65536]
  ret = aclvencSetChannelDescKeyFrameInterval(m_vencChannelDesc,m_keyFrameInterval);
  if (ret != ACL_ERROR_NONE) {
    std::printf("[%s][%d][chn:%d] aclvencSetChannelDescKeyFrameInterval "
                "failed, errorCode[%d]\n",
                __FUNCTION__, __LINE__, m_channelId, ret);

logPrint.W(__FUNCTION__, __LINE__, YLog::ERR, "aclvencSetChannelDescKeyFrameInterval failed, errorCode", ret);
    return -1;
  }
  ret = aclvencCreateChannel(m_vencChannelDesc);

m_vencFrameConfig = aclvencCreateFrameConfig();
  // ret = aclvencSetFrameConfigEos(m_vencFrameConfig, 0);
  ret = aclvencSetFrameConfigForceIFrame(m_vencFrameConfig, 0);

m_inputDvppPicDesc = acldvppCreatePicDesc();
  if (m_inputDvppPicDesc == nullptr) {
    std::printf("[%s][%d][chn:%d] acldvppCreatePicDesc failed \n", __FUNCTION__,
                __LINE__, m_channelId);

logPrint.W(__FUNCTION__, __LINE__, YLog::ERR, "acldvppCreatePicDesc failed, chn", m_channelId);
    return -1;
  }
  ret = acldvppSetPicDescFormat(m_inputDvppPicDesc, m_dvppPixelFormat);
  ret = acldvppSetPicDescWidth(m_inputDvppPicDesc, m_outputWidth);
  ret = acldvppSetPicDescHeight(m_inputDvppPicDesc, m_outputHeight);
  ret = acldvppSetPicDescWidthStride(m_inputDvppPicDesc, m_outputWidth);
  ret = acldvppSetPicDescHeightStride(m_inputDvppPicDesc, m_outputHeight);

以上是视频硬编码关键性参数设置，如果有使用不当或者参数遗漏请告知，谢谢！

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