Content Delivery Specifications

GRIDSHOT® recommends the following specifications for best broadcast experience. In addition, we also recommend that the content bitrate is always higher than playout output. Delivery in other formats will be accepted after test files have successfully been delivered, tested and agreed to by theFrontDoor in advance.

File containers

ISOBMFF MP4 (MPEG-4) *.mp4

Video 4K Ultra-high-definition (4K UHD)

Resolution 3840 × 2160px
Scan type1 Progressive
Aspect Ratio 16:9 (DAR) 1:1 (PAR)
Codec HEVC / H.265 (Main or Main10)2 or H.264 (High@L5.2)
Bitrate H.265: Between 15 - 50 Mbps (CBR)3
H.264: Between 40 - 80 Mbps (CBR)3
Framerate 50 fps (or 25 fps the playout will duplicate each frame)
HDR Optional: HDR HLG. Content must be natively recorded and mastered in HDR HLG. The video file must have the transfer_coefficient tagged as arib-std-b67(18). Alternatively, for HEVC sources the alternative_transfer_coefficient in the SEI is also accepted if it is tagged as arib-std-b67(18).

Video High-definition (HD)

Resolution 1920 x 1080px
1280 x 720px (720p is always progressive)
Scan type1

Interlaced (Top field first) preferred
Optional progressive

Aspect Ratio 16:9 (DAR) 1:1 (PAR)
Codec H.264 (High@L4.1)
Bitrate Between 15 - 50 Mbps (CBR)3
Framerate 25 fps

Video Standard-definition (SD)

Resolution 720 x 576px 
Scan type1

Interlaced (Top field first) preferred
Optional progressive

Aspect Ratio 16:9 or 4:3 Anamorphic
Codec MPEG-2
H.264 / AVC (High@L3.1)
Bitrate Between 15 - 50 Mbps (CBR)3
Framerate 25 fps

1For the best result interlaced content should be intrinsically fully interlaced and therefore preferably not result from prior frame rate conversions and/or telecine sources.
1If the source is 8-bit, transcode to the Main profile. If it is 10-bit, then Main 10.
3Higher bitrate will incur increased storage cost and cost more time for uploading to GRIDSHOT Media Asset Management (MAM).

Audio combined with video

Codec AAC-LC preferred for best quality
MPEG Version 1 Layer 3
Sampling rate 48000 Hz
Bitrate >= 256 Kbit/s (for compressed audio codec)
Loudness Peaks preferably don’t exceed -3 dbFS or should conform to EBU R128
Channel layout Stereo interleaved (dual mono is not allowed)
Channel count 2

Audio language versions

GRIDSHOT® supports unlimited number of languages

File containers (compressed audio only)

ISOBMFF MP4 (MPEG-4) *.mp4 or *.m4a, MP3 *.mp3

Specifications

Codec AAC-LC preferred for best quality
MPEG Version 1 Layer 3
Sampling rate 48000 Hz
Bitrate >= 256 Kbit/s (for compressed audio codec)
Loudness Peaks preferably don’t exceed -3 dbFS or should conform to EBU R128
Channel layout Stereo interleaved (dual mono is not allowed)
Channel count 2

File containers (uncompressed audio)

WAVE (*.wav)

Specifications

Codec PCM S16 LE
Sampling rate 48000 Hz
Loudness Peaks preferably don’t exceed -3 dbFS or should conform to EBU R128
Channel layout Stereo interleaved (dual mono is not allowed)
Channel count 2

Subtitle

*.srt (SubRip)