Ericsson SPR1100 Operations Instructions download pdf (Page 29)

Introduction

1.3.3.4 Subtitles

When subtitles are passed through with a video stream that is either up or down

converted, the subtitle text size is not rescaled, so it appears too big or small for the

new video resolution. For example:

 When the video is down converted (HD to SD) the subtitle text becomes smaller.

 When the video is up converted (SD to HD) the subtitle text becomes larger.

The text position may also be incorrect.

1.3.3.5 Closed Captions

Closed capti

ons in the incoming Transport Stream will be encoded in the output

stream using:

 ATSC A/53 in MPEG-2 video.

 ATSC A/72 in MPEG-4 video.

1.3.4 Service Components

Each service must have one video stream and must have:

 1 PiP.

 Up to eight transcoded audio streams,

And

 Up to eight passed through components (which may be all audio, all data or a

mix of audio and data).

1.3.5 PID Processing

1.3.5.1 PID Remapping

In the default setting, the PIDs on the input service elements are carried through

onto the output service. However, the PID numbers can be changed on any or all of

the PIDs in a service and they are remapped accordingly in the PMT.

PID remapping is always required when duplication of a service or service element

is performed as copies cannot have the same PID.

1.3.5.2 Change of Input PIDs

If a PID on an input service is ch

anged, the SPR1100 cannot automatically follow

the change. Within the unit, the link between the input and output service is made on

the service name and not the PID number. However, the input PID is linked to the

input service name, so, if the PID changes, the link to the service name is lost.

2/1553-FGC 101 1400 Uen B

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Ericsson SPR1100 Operations Instructions Page 29