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Having got so fed up with the wrong titles on the HDD recordings, with no expectation of a fix from Sony, I've tried to see what I can do to rename the recorded titles.
I've been using a WD Essentials 300Mb drive for recording. The Bravia TV has formattted it into a number of partitions and volumes, not recognised by Windows, but readable in Linux.
As you'd expect, the largest partition has the actual recordings in a "stream" folder. But in 2 other partitions, there's a "db" folder with a file "0001.db" - which is a SQLite database. These 2 copies appear to be identical.
The database is a pretty straightforward list of the recordings with - hurrah! - a "title" column.
So all you have to do to correct the recording titles is:
1. Get hold of a Linux system with SQLite database browser.
2. Edit the titles in each copy of the database.
What could be simpler? (well, a Rename option in Title List?)
PS. No sign of the Recording Results list...