Why is Download.contentLength significantly larger than the storage consumed?
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Description
I've implemented the DownloadService to allow our Widevine protected DASH content to be watched offline.
To give the user an indication of how much storage space the download is taking, we use the contentLength taken from the Download (which is provided by the DownloadManager).
What we've noticed is that the value returned via the API is significantly (> 10%) larger than the actual storage space consumed.
As an example, I've downloaded a box set containing 23 episodes. Media3 reported the sum total of these assets as 4282024986 bytes (4.28GB). When querying the filesystem, it reports only 3710903506 bytes used (3.71GB).
If anything, I would have expected the filesystem to report higher, due to incomplete storage blocks.
So what is contentLength, if not the size of the storage consumed? Is there a more accurate way to get the download size?
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