Preroll

Ad format with video that plays before the news clip or other content from the site is played. Preroll plays in the first position, Bumper in the second position, and then the content clip is played.

VAST
When using VAST, the advertiser hosts the material. Web TV supports VAST up to version 4.0. VPAID is not supported.

Video recommendations:
Size: Aspect ratio 16:9, recommended size 1920x1080.
Duration: 15 sec
Container: MP4
Video codec: H.264
Max framerate: 30
Audio Codec: AAC
Audio sample rate: 48000 Hz
Audio levels: -23 LUFS (+/- 1.0) in the EU as per EBU R128
Max audio true peak: -1.0 dBTP
Video bitrate: minimum 2500 kbps
Audio bitrate: minimum 128 kbps - maximum 320 kbps

File formats:
MP4, MPEG4, 3GPP and MOV files
AVI 
MPEGPS
WMV
HLS
WebM files - With Vp8 video codec and Vorbis Audio codecs