Stargazer said:
So basically its around 8 audio channels to equal one audio/video channel so that would be around 96 channels to equal a full transponder.
Maybe the reason why they spread the audio channels out across many transponders so that they can compress the content on each transponder a small amount to where they can add one or two audio stations where it is not that noticable compared to putting them all on one transponder.
I believe part of the reason for the spread is that audio channels don't compress in the same way as video. An audio stream is going to consume the same amount of transponder 24/7/365. Video streams vary in size.
Think of video streams as soft sponges and audio streams as marbles. Your jar may be able to fit 10 video stream sponges and 26 audio stream marbles (including the audio that matches the video - add more marbles if your video has SAP). That would be considered a full transponder. But can you stick 96 marbles in that jar? The marbles don't give up space like the sponges.
(Then again, if the 10 SD plus 16 Audio plan leaves overhead for when all 10 SDs need to expand to show more action you may be able to do more than 96 audios on a transponder.)
Here's a cool MPEG2 trick: The streams that make up one channel don't have to be unique to that channel. Technically speaking, they could uplink a video stream (Dancing Dish, Sirius logo) and multiple audio streams.
Create a "channel" that uses the Dancing Dish with Aud01.
Create a "channel" that uses the Dancing Dish with Aud02.
Create a "channel" that uses the Sirus logo with Aud01.
Create a "channel" that uses the Sirus logo with Aud02.
Four descrete channels that appear to be video channels but they are using two video feeds and two audio feeds.
BTW: This trick is done often with PPV Sports (including the off-air screens) sharing the same PIDs as static channels and with GOL TV offering different audio selections depending on which channel you are watching.
If they have room for one video feed on a transponder with audio streams they could put up a "virtual radio" that would blow the screen saver of DishCD off of the screen.
JL