I tested only with one video M2T H264 1280x720 9Mb 50i DD 192Kb => 3.4Go.
Why Encore said 4.64Go in used space with PCM audio mode in Encore setting ?
Why Encore said 4.025Go in used space with DD audio mode in Encore setting ?
I exported to ISO in both mode and when I checked it => 3.56Go for the both !
Someone could tell to me why? Because with all my footage encore said 28Go used space instead of 23!
The dis cinfo is higher because the file you are using is not legal for Blu-ray. (That is clear from the Blu-ray transcode settings in the project panel.)
So En would need to transcode the file. This might be taking up space and also MPEG takes more space than H264 and your project setting is MPEG2.
Also PCM takes a lot more space than Dolby.
Again there are some navigational overheads that are added to the size of the project. That is why you are seeing such a difference. Bring in a legal file and you will notice that only navigational overheads gets applied and nothing else.
You said "the file you are using is not legal for Blu-ray".
Not Legal = have to be transcoded ?
Another thing: my file is in H264 so Encore didn't transcode it.
You see it in project panel "ne pas transcoder = don't transcode.
It's automatic , it's not me that it put it.
After exporting ISO, I checked and Encore didn't make any transcode.
Why there is difference between pcm 4.64Go and dolby 4.025Go because there isn't any difference in both ISO => exactly the same capacity.
OK, that's my mistake. Google translator messed it up for me. Its auto detect language feature seems is not good.
This seems to be a bug. Because your file is a muxed video file which is shown to be legal by En and still there is a difference in PCM and Dolby settings.