Video source question for encode

[iKron]

Lets say i have a bluray disk,

1. i made a mkv file without any encode from the bluray disk
2. i encode the mkv file reasonably good bitrate, lets say 10~14mb/sec, x264 codec/format.


now i want to encode the file to x265 codec. reasonably lower bitrate. lets say 4mb/sec. will it be fine if i encode the x265 file from the encoded file (option 2) or i will lose a
significant data. basically my question is which source file will give better output or there will be no difference or very small difference.

sorry for my bad english.

[davexnet]

For best quality, go back to non-encoded MKV file and use that as the source for your new
x265 encode

[jagabo]

It depends on what your definition of "significant" is. You should just try both and decide for yourself.

[iKron]

thank you for the suggestions.

[jagabo]

In case it wasn't clear... Each encoding with a lossy codec loses quality. So a two step encode from a source to x264 then to x265 will lose more quality than a single encode from a source to x265. Given the relatively high bitrate of your x264 intermediate, and the much lower bitrate of your x265 encoding, the difference probably won't be very big. But whether that's "significant" is up to you.

[iKron]

thank you for the explanation.