Philips CINEMA21:9 50PFL7956 User Manual page 52

Audio to Video synchronisation (sync)
If the sound does not match with the video on screen, you can
set a delay on most DVD Home Theatre Systems to match the
sound and video.
Read more about Audio to Video sync in Help > Setup >
Devices > Audio to Video sync.
Do not connect the audio signal from a DVD player or other
device directly to the Home Theatre System. Always route the
sound through the TV first.
Recorder
Use 2 antenna cables to connect the antenna to the device and
the TV.
Add an HDMI cable to connect the device to the TV.
52 Connections / Connect devices