Use external clock if no audio output device is available
avr: fix wrong output samples

result data is correct if swr is used
Merge pull request #326 from mwachtler/noaudiodevice

Use external clock if no audio output device is available
show the first frame after seek on pause. 1.4.1 regression. issue325

the way of seeking was changed after 1.4.0 to avoid frequent seek
request better. old seeking solution is ugly using a timer. but new
code result in no video frame update after seek on pause.
TODO: play frame by frame may not work still
fix play frame by frame regression in 1.4.1. extractly 1 frame now

also works for audio
Merge branch 'master' into load

Conflicts:
	src/AVPlayer.cpp