DekTec DTC-300 StreamXpress - Manual (Page 21)

DTC-300-SP – StreamXpress
USER MANUAL
21
#1 TS Rate:
The native TS rate is derived by reading the PCR values in the first 12MB of the file, counting the
number of bytes between PCR values and correlating with the PCR values.
NOTE: If the file has bad PCR values or there are no PCRs detected, the TS rate will be wrong. The
same will happen if the stream is VBR. In this case the user can type in its own value for the TS rate.
If the TS rate is different than the calculated bitrate, the TS rate will turn red. If the StreamXpress
plays a file at the non-native rate, it may result in bad timing of the A/V which may result in picture
breaking up and pixelating.
#2 Out Rate:
The output rate will follow the native TS rate by default but represent the actual playout rate. The
output rate can be set independent of the native rate. Note that without remultiplexing (RMX button)
the stream won’t be able to be decoded properly if played at a different rate than the native rate as
the PCR values will not be correct.
#3 RMX:
StreamXpress offers the capability to remultiplex the open TS by adding in real time Null Packets
(stuffing) and recalculating PCR and PTS/DTS on the fly.
This is desirable when trying to play to a modulator that requires a fixed input bitrate.
NOTE: StreamXpress can only add Null Packets and cannot play properly at a rate lower than the
native rate (even if the original stream contains null packets).
NOTE: If the output rate is set lower than the native TS rate, the Out display will turn orange.
3.4.2 Packet size
StreamXpress support the playback of multiple TS formats. It supports 188 byte packets, 204 byte
packets (188 +16 zero bytes) and raw playback.
If the original file contains 188 byte packets, the user can choose to playout 188 byte packets
(Native) or 204 byte packets (188+ 16 zero byte) or can play a file in raw format.
NOTE: StreamXpress cannot calculate valid Reed-Solomon bytes so therefore the 16 additional bytes
with be zero bytes.