[mythtv] Menu problems with internal DVD player in ATrpms build 0.21-178_trunk_r16254

[John Pilkington]

The internal player lacks sound on initial entry to the menus and the
item-selection frame is invisible, although still active.  This applies
both when playing a real DVD and when using the Mytharchive utility.

Once beyond the menu phase it all seems to work.  Sample of terminal
output below.  The references to 'AC3 has 0 channels' and to the
subtitle codec puzzle me.  The DVDs were recent Mytharchive products
with AC3 sound only.

2008-02-27 08:35:03.915 TV: Changing from None to WatchingPreRecorded
2008-02-27 08:35:04.034 OpenGLVideoSync()
2008-02-27 08:35:04.109 Video timing method: SGI OpenGL
2008-02-27 08:35:04.687 NVP: Disabling Audio, params(-1,-1,-1)
2008-02-27 08:35:04.703 AFD: Warning, video codec 0xb636750
id(MPEG2VIDEO) type (Video) already open.
2008-02-27 08:35:05.269 AFD: codec AC3 has 0 channels
2008-02-27 08:35:05.270 AFD: Opened codec 0xc4202c0, id(AC3) type(Audio)
2008-02-27 08:35:11.182 AFD: Warning, video codec 0xb636750
id(MPEG2VIDEO) type (Video) already open.
2008-02-27 08:35:11.182 AFD: Warning, audio codec 0xc4202c0 id(AC3) type
(Audio) already open, leaving it alone.
2008-02-27 08:35:11.182 AFD: codec AC3 has 2 channels
2008-02-27 08:35:11.182 AFD: Opened codec 0xc5feec0, id(DVD_SUBTITLE)
type(Subtitle)
2008-02-27 08:35:27.456 GetNextFreeFrame() served a busy frame A.
Dropping. UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUL
2008-02-27 08:35:42.495 GetNextFreeFrame() served a busy frame E.
Dropping. UULUUUUUUUUUUUUUUUUUUUUUUUUUUUU
2008-02-27 08:35:51.664 NVP: Disabling Audio, params(0,-1,-1)
2008-02-27 08:35:51.809 [mpeg2video @ 0x3e1d980]slice mismatch
2008-02-27 08:35:51.809 [mpeg2video @ 0x3e1d980]00 motion_type at 2 4
2008-02-27 08:35:51.809 [mpeg2video @ 0x3e1d980]00 motion_type at 6 5
2008-02-27 08:35:51.809 [mpeg2video @ 0x3e1d980]00 motion_type at 1 6