MythTV UPnP incompatible with WD TV Live

[TS <thoseni@…>]

Using Western Digital TV Live (generation 3) to play recordings made by MythTV does not work if the "subtitle" for the recording is empty. In this case MythTV sends back the "description" of the recording instead, and if this field happens to be longer than 220 characters, WDTV Live will not play the recording.

An old and closed Ticket 6114 suggests a patch in which only the first 128 characters of the description is returned. This is not how MythTV is currently implemented though, but the suggestion still makes sense for two reasons at least.

One is that the subtitle column in the recorded table is char(128) so if a subtitle was present in the first place then at most 128 chars would be returned.

Another is that the subtitle/description value is returned in an xml element called "title" indicating that this is not the place to insert a full description of a recording?

[TS <thoseni@…>]

A sample of the upnp HTTP req/response when trying to play a recording with an empty subtitle

[Github]

Limit the uPnP recording description length to 128 characters for compatibility. When a recording doesn't have a subtitle, we currently insert the full description of the recording into the title/subtitle. As this breaks some uPnP clients, let's truncate the description at 128 characters for compatibility.

Fixes #10358.

Branch: master Changeset: 7f8dda1aad52f3ee789514bf762c666fb347131a