DVD subpictures without an explicit 'end' time are not shown.

[peper03@…]

The 'end' time for DVD subpictures defaults to zero, which prevents them being shown if they don't include an explicit command to set it.

The attached patch initializes the 'end' time so that the subpicture shows forever (or until the next subpicture). This allows DVDs such as those found ​here to play (note subtitles must be turned on to see anything!)

Additionally, the also adds minimal handling for the 'CHG_COLCON' command, which doesn't occur often, but is currently not recognised. This could lead to issues due to the code attempting to interpret the data for the command as new commands. The new handling simply skips over the data to the next command.

[peper03@…]

Updated patch

[peper03@…]

The updated patch initializes end_display_time to the same value as start_display_time.

Also, the number of subtitles that can be buffered is increased to 40 to (hopefully) allow as many subtitles to be buffered as video frames (OpenGL on my machine buffers 29 frames, so for full frame-rate subtitles/subpictures, it must be possible to buffer the same number of subtitles).

Note that the patch from #11451 must be applied before either of these patches.

[peper03@…]

New patch (0001b) adds a check to ensure that an end time has actually been set before clearing a menu highlight. Otherwise the highlight would only appear for one frame on menus where no end time was specified.

[Richard <peper03@…>]

In e5e9cc8ce4841c233db9604d3296e243aa0a3e54/mythtv:

Ensure that DVD subpictures that don't explicitly set the 'end' time are still shown. Also, handle 'CHG_COLCON' command by skipping over the data. This should prevent any issues caused by incorrectly interpreting the data as subpicture commands.

Fixes #11455

[Richard Hulme <peper03@…>]

In 811be23159604626ee8675400692cccc4599229f/mythtv:

Apply additional changes from third patch in ticket #11455 that should have been applied in [e5e9cc8ce]. The first patch was applied by mistake.

Refs #11455