Cable TV digitazation

The digitization of Cable TV is the process of converting traditional analog TV signals into IP-based signals, enabling all TV channels to be accessible via IP addresses. Before digitization, TV channels operated using MPEG-2 SD/HD workflows, with all equipment designed to comply with MPEG-2 standards.

In a Digital Video Broadcasting (DVB) system, MPEG-2 audio-video packets are transmitted over MPEG Transport Stream (TS). TS (Transport Stream) encapsulates the following:
Audio packets
Video pakets
Program Data Tables
This format is widely used in applications like IPTV, where packets are transmitted over multicast IP using protocols like UDP or RTP. A multicast IP can carry signals for one or multiple TV channels.

SPTS (Single Program Transport Stream)

SPTS refers to a transport stream containing only a single TV channel.
For example: udp://255.5.5.1
In this case, the multicast IP 255.5.5.1 contains only one TV channel.

MPTS (Multi Program Transport Stream)

MPTS refers to a transport stream that contains multiple TV channels.
For example: udp://255.5.5.1
Here, the multicast IP 255.5.5.1 carries several TV channels simultaneously
Note: The multicast IP mentioned is within the valid range of multicast IP addresses.

MPTS to SPTS Conversion

Purpose: Separate multiple TV channels from a single multicast IP into multiple single-channel multicast IPs.

SPTS to MPTS Conversion

Purpose: Combine multiple single-channel multicast IPs (SPTS) into a single multicast IP (MPTS). Our software is designed to help convert SPTS into MPTS effortlessly.

CBR vs. VBR in Transport Streams

Transport streams can have two types of bit rates:
CBR = Constant Bit Rate
VBR = Variable Bit Rate

To convert VBR to CBR, null packets (empty packets) are inserted into the stream. VBR streams can cause freezing of TV channels packed in a QAM, as one channel requesting a higher bitrate may consume bandwidth allocated to other channels. To prevent this, converting VBR to CBR with null packets and setting a maximum bitrate ensures smooth transmission without disrupting other channels.

Contact Us for More Information

For further details about our hardware and software solutions, feel free to reach out to us by filling out our contact form, and we’ll get back to you!
Email: sales@multivirt
Phone: +91-9810064903 | +91-9891164845
You can also Contact Us directly on this page for help with SPTS to MPTS or MPTS to SPTS conversions.