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16. Content Specifications
VPU content should require to the following specifications.
To convert video content into MPEG2 see subchapter
:
Rovi TotalCode Studio for converting your content into
MPEG2
To convert video content into HAP see subchapter
:
Hap Content Converter
Video content requirements format 'MPEG':
'MPEG' Video requirements
Video codec
MPEG-2
Bit rate
Constant Bit Rate (CBR) 10 - 30 Mbps (Mega bit per Second), Variable Bit Rate
(VBR)
(1)
Frame rate
24 fps, 25 fps, 29,97 fps, 30 fps, 50 fps, 60 fps
(2)
GOP-Structure (Group of
pictures)
GOP 12, I-Frame only
(3)
Container format
Program Stream (with sound) or Elementary Stream (without sound)
Audio stream
LPCM (uncompressed, 48 kHz, 16 Bit) or MPEG-1 Layer 2 (48 kHz, 384 kbps)
Color space / Chroma format 4:2:0
File extension video
.mpg, .mpeg, .m2v, .mpv
(4)
Pixel aspect ratio
1:1
(1)
Please note that VBR is also possible but prevents frame-exact playback from first to last frame. We strongly
recommend CBR. Please also note that the bit rate heavily depends on the resolution of your video clip and on
the content itself (e.g. lots of signal changes) !!! Using variable bit rate (VBR) causes loop problems, so please use
constant bit rate (CBR)!!!
(2)
Please note that frame rates above 30 fps are extremely resource-consuming and will decrease the
performance. Use these high frame rates only for specific reason.
(3)
GOP 12 is possible for simple playback without jumping within the frames (indexing). The more B- and P-
frames are used the higher the compression, the smaller the file size. I-frames only is also possible but increases
the data rate.
(4)
Files with a leading "._" e.g. "._test.mpeg" are ignored by the VPU software because these files are created by
the MAC OSX operating system.
General notes:
Program Stream => contains video and audio files, typical file extension .mpg
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grandMA2 User Manual - Content Specifications
Version 3.4 – 2018-07-25
English