BridgeTech VB20 User Manual page 79

Thumbnails
The probe will try to generate thumbnail pictures for all streams. For multi-program
transport streams (MTPS) the first video component is selected. Both MPEG-2 and
MPEG-4 video formats are supported (standard and high definition).
The thumbnail update rate will depend on the number of streams available in the
view, i.e. the update rate will generally be higher in 'Current page' mode than in 'All'
mode. When a small thumbnail is clicked the larger thumbnail image will have an
increased update rate.
If the probe cannot generate a thumbnail from the signal, it will present one of the
following icons:
Shown if no data is received for the stream. There should be a match
between presenting this icon and a No-signal alarm; however since the
alarm and thumbnail mechanisms work independently of each other
they have been given different names (loss of signal and no signal).
Shown while the thumbnail engine is trying to decode a thumbnail
picture and more precise status information has not yet been obtained.
This icon is typically displayed after probe reboot or if new streams have
recently been joined.
Shown if the stream does not carry a video PID – which is the case for
radio streams.
The probe does not support thumbnail generation for this protocol
mapping. In this version of the probe TS/UDP and TS/RTP are supported.
This icon is shown if the probe is unable to receive or analyse the PMT
PID. Only streams with PSI information can have thumbnails decoded
since the probe does not support a manual specification of the video
PID.
The probe can only generate a thumbnail picture if the video data is not
scrambled.
The signal is recognised as being MPEG-2 encoded but cannot be
correctly decoded by the thumbnail extractor.
The signal is recognised as being MPEG-4 encoded but cannot be
correctly decoded by the thumbnail extractor.
The signal cannot be decoded due to excessive CC errors.
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80
PROBE USERS' MANUAL VERSION 5.0
www.bridgetech.tv