Speed of saving to BD-25 versus DVD-9?

[setarip_old]

Although I haven't recorded the specific times, I've noted that, with all other settings being equal (primarily, using One-pass ABR), compressing a greater than 25GB (up to 50Gb) Blu-ray to fit on a 25GB BD takes about 25% MORE time than compressing it to fit a "BD9".

My rapidly deteriorating mind tells me that logically, it should take LESS time (due to less compression) to compress to 25GB.

Would someone be good enough to point out the flaw in my logic?

Thank you ;>}

[jdobbs]

Although I haven't recorded the specific times, I've noted that, with all other settings being equal (primarily, using One-pass ABR), compressing a greater than 25GB (up to 50Gb) Blu-ray to fit on a 25GB BD takes about 25% MORE time than compressing it to fit a "BD9".

My rapidly deteriorating mind tells me that logically, it should take LESS time (due to less compression) to compress to 25GB.

Would someone be good enough to point out the flaw in my logic?

Thank you ;>} You're processing and writing almost 3 times more data to disc, and that seems to be why a BD takes longer. As for the compression -- at a given quality level, the actual time analyzing and processing is going to be about the same.

[setarip_old]

@jdobbs

Excellent!

As simple as "Writing more takes more time" - I guess I'm now the elder leader of the "Can't see the forest for the trees" club ;>}

Thanks again.

[Asmodian]

This is even true for different crf values, usually lower values take longer.

I believe it was once explained by Dark Shikari as the encoder doing more math to work out the best way to handle the extra data. It isn't the size of the extra data (you are probably not IO limited) but the extra calculations involved in creating it.