Using a buffer in this way is quite common. Similarly a buffer is used on the receiving end to decode the MPEG2 stream. In order to generate a CBR stream a buffer is used to "even out" the variable bit rate into a somewhat constant bit rate. MPEG2 in its initial form will always be a stream with variable bit rate, VBR. But why are people in the TV biz talking about CBR MPEG2? This needed some research and I discovered that my assumption was not totally wrong. This is a bit odd to begin with since as far as I know there is no such thing as a CBR MPEG2. In the same time the material transferred is in most cases MPEG2 video (at least here in Sweden). I won't go into the details of DVB-T modulation but this is quite reasonable since it is most likely the only way of keeping it in sync and locked. Generating a stable stream without errors and dropouts was definitely harder than I initially thought.ĭVB muxers (or shall we call them modulators?) need to run at a constant bit rate, CBR. These streams are to be received by Telesté Luminato boxes equipped with DVB-T muxes. The streams are to be created in real-time and encapsulated in MPEG-TS and sent over an Ethernet network using multicast UDP. I have been trying to generate MPEG2 streams using FFMPEG for a cable TV project I'm working on.
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