Program Stream and TransportStream Difference

There will be no difference between Program Stream and Transport stream. Except Header...

TS have VOS,VO and VOL headers. But the PS( Program Stream) is directly having VOL

headers. Sometimes we referred it as Elementary Stream.

if the Packet is having only video or audio, we call it as Elementary Stream.
if the packet contains both audio and video, we call it as Program Stream.
if the Packet contains one or more program stream we call it as Transport Stream.
we can carry more channels over the TS.