Chromebooks can do android apps, which is how I run Amazon Prime video. It allows several different quality settings:
130MB/hr is pretty danged good, and reported download sizes matched that estimate. A couple of weeks ago the reported download sizes ballooned:
For those without a calculator handy, that is 249.8MB/hr, about double one would expect. This got my attention.
I tried using an “ask every time” option (and thereafter picking Data Saver) and those estimates agreed with the 130MB/hr rate, in this case 50MB for a ~21 min show:
The displayed filesize for the download was 87MB:
I began to wonder if the app wasn’t misrepresenting the filesize. I looked at the sdcard subdir where all the data is reportedly kept; it had 319MB of data in it instead of the 499MB the app said:
319MB for 139 minutes (2.32hrs) of video = 137.5MB/hr, which is close enough to 130MB/hr.
Hypothesis - Assuming downloads are being stored on the card where they should be, the Prime app appears to be misreporting the size of the downloads.
Test - I checked data usage for the app before and after another download.
predicted d/l size: ~50MB
reported d/l size in app: `80MB
data usage increase shown in android settings: ~40MB
android data folder showed 40MB increase in size
Conclusion - the app is showing the wrong download size, approx 2x as large as it really is.
WAG - this may have started when I went to the internal sdcard instead of a usb flash drive. Don’t remember.