Ask questions to BD authoring and compression insider "2themax"

[2themax]

Originally Posted by Icemage

Can you expand more on what the different effects on video ABR would be?

On something as long as LOA, the ABR may jump around 1Mbps or so.

The way I've been led to believe, as long as the total audio streams total less than 8Mbps, then the 40Mbps peak is safe in all instances if we're just talking about bandwidth usage and had infinite storage capacity.

How, then, does the video ABR decrease based on the audio codec used in this example? Is it because of capacity issues (i.e. PCM 5.1 24/48 eats up a lot more space, and therefore less capacity can be allocated, making the max sustainable ABR lower?).

Is there a piece of the puzzle that I'm missing somewhere, or is the video ABR difference you mentioned above simply due to storage capacity limitation changes based on the space consumed by the audio?

Your exactly right. The raw PCM is going to take up more physical room on the disc. And since disc space is limited, the video ABR will have to suffer. However, if your audio peaks at less than 8Mbps, the video can still peak at the max of 40Mbps.