DMG 3200/3100/3000 – User Manual
Page 228 (306)
GOP
GOP Size
Controls the GOP length (distance between I or IDR frames). The
selected GOP size will be applied to output profiles with frame
rate equal to expected frame rate (configured in the Source
page). For output profiles with lower frame rate, the GOP size will
be adjusted to achieve GOP alignment.
IDR Frequency
Sets how often I frames should be upgraded to IDR frames.
IDR-to-IDR Time
Status field presenting the distance in time between IDR frames;
calculated on the basis of configured GOP size and IDR frequency.
Subtitling
Sub Burn-in 1
st
Language
Specify the 1
st
Language for Sub Burn in from drop down list.
Sub Burn-in 2
nd
Language
Specify the 2
nd
Language for Sub Burn in from drop down list.
Priority
Specify the Subtitling Selection Priority.
Miscellaneous
Aspect Ratio
Aspect Ratio can be selected from below options
• Transparent
• 16 x 9
• 4 x 3
The user can adjust the subtitle language priority on type basis. If a service contains both DVB
subtitling and
EBU subtitling on same language, the transcoder will select subtitling source based on
the type priority configured.
To ensure interoperability with segmenters and multiscreen clients, the values of GOP Size and
IDR Frequency have to be selected with these devices in mind. The IDR-to-IDR Time
represents the smallest segment size that can be produced.
8.6.2 Audio Parameters
On the Universal Transcoder- Multiscreen there are two audio transcoders per path. These
support MPEG-1, AAC-LC, HE-AACv1 and HE-AACv2 as input and output codec. AC-3 and E-
AC-3 input is also supported (decoding only - not encoding) if the Dolby® Digital Plus
Professional Decoder license is installed on the module. Multichannel inputs (e.g. 5.1) will be
downmixed to 2.0 as part of the transcode process.
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