Philips 14AA3322/40B Guía de instalación Pagina 95

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Generation of a transport stream for DVB and realisation of a HF-modulated DVB-signal
95 | P a g e
Figure 2.10: Mux Usage Chart
Question21
Is it better to broadcast with fixed or variable bitrate? Why?
It is better to broadcast with variable bitrate because then we allow every TV channel to take the bitrate
that it needs. For example, a football match or scenes with a lot of motion, in general, need more bitrate
than a static image.
Question22
If the ES bitrates are variable, is the overall bitrate of the multiplex variable too?
No, the overall bitrate is always constant (fixed).
Now open the file called “mux2a.ts”
Question23
Why do the snapshots of the TV channels look so weird?
Because there are some parts missing during the playback. (REMARK: We don’t know if there are errors
at the reception. We can only understand that there are some parts missing during the playback. This
can be due to: bad weather bad transmission, bad reception conditions program’s playback disability,
errors at the broadcasting video codecs, errors at the reception, etc.)
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