convert x265 to x264

[xchcui]

Hi.

I read that hvec(x265) codec can give the same quality
video compare to avc(x264)codec,while using 40%-50% less
bitrate for second(smaller file size).
So,if i would like to convert a video file with x265 codec to x264 codec
and i would like to save the quality(or minimize the loss),should i double the bitrate/sec while i make the conversion to x264?

Thanks.

[ProWo]

For a good x264 quality encode with CRF range 18-21. The bitrate is determined by the encoder.

[xchcui]

Thanks,ProWo.
Yes,i am familiar with the CRF option,
But what if the software doesn't have the CRF parameter option?
and there is only the option to choose bitrate/sec value,
should i double the bitrate value?maybe triple it?when i convert x265
to x264?

[ProWo]

Use my clever Ffmpeg-GUI. It has the CRF Setting for the h264 encoder.

[xchcui]

Thanks ProWo for your software
link and for your help.