DVDCodecs: Amlogic: Handle conditions in which amcodec should be opened during Open()

DVDCodecs: Amlogic: Use mpeg2 video codec for mpeg2's

* AM Video Codec cannot properly handle the still-frames within DVDs

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>

DVDFactoryCodec: Remove throttling of mpeg2 to libmpeg2 for amlogic

* Thanks to @kszaq, am-mpeg2 can handle all mpeg2's however it can't handle the still frames (which is caught above it).
* Testing .VOB isn't setting hint.stills to true so will need to address this in separate patch

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>

DVDFactoryCodec: Further conditionalize HAS_LIBAMCODEC opening

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>

DVDFactoryCodec: Amlogic: Force rmvb to ffmpeg

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>

DVD: Amcodec: Handle conditions in which amcodec should be using during open

* Instead of before

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>
Merge pull request #4539 from Matricom/amcodec

DVDCodecs: Condense and update HAS_LIBAMCODEC
Merge remote-tracking branch 'upstream/Gotham'
Merge pull request #4624 from FernetMenta/paplayer

paplayer: dvdplayercodec - check if seek is possible before trying to se...
Merge pull request #4626 from Voyager1/fix-trac15163

[fix] only check video playlist status to determine fullscreen playback
Merge pull request #4619 from fritsch/aefixes

ActiveAE: correct time of buffered samples by resample ratio
Merge pull request #4615 from bombizombi/master

Fix for OSD auto hide not working
Merge pull request #4601 from jmarshallnz/play_media_sort_order

[builtins] PlayMedia() should use a sort order appropriate for the items
Merge pull request #4616 from kit500/master

fix resume behavior for plugins with stack
Merge pull request #4614 from Montellese/upnp_player_logging

upnp: add some potentially useful logging to CUPnPPlayer::PlayFile()
[gui] fix incorrect parsing of relative <width> and <height> tags
Merge remote-tracking branch 'upstream/Gotham'