VXG-7 - Video streaming in real-time
The VXG-7 encoding and streaming solution provides real-time streaming for both standard and high definition video. The multichannel encoding unit encodes up to four SDTV / two HDTV feeds either in H.264/AVC or MPEG-2. All outgoing transport streams are DVB compliant. The integrated forward error correction mechanism ensures video quality on glitchy transmission media.
VXG-7 DVB encoders offer cost-effective broadcast quality 24 hours a day. They are perfectly suited for studio links, SNG and content distribution to IPTV-headends.
VXG-7 - Key Features
- Real-time H.264/AVC video encoding and streaming in SD or HD resolution (720p/1080i)
- Direct-to-DVB output over ASI | QAM | COFDM | IP Ethernet (incl. Multi-service streaming)
- Robust broadcast streaming architecture
- QoS (RSVP)
- Robust lip-sync mechanism even on transmission errors
- PRO-MPEG FEC
- Unicast/multicast mode
- UDP/RTP transmission
- Integrated teletext transmission (SMPTE-2031/OP47)
- SD/HD-SDI Embedded audio
- Dolby Digital and Dolby Digital Plus audio encoding
- MCTF (Motion Compensated Temporal Filtering) and De-blocking
- AFD (Active Format Description) signaling
- Redundant power supplies and automated restart after power or network loss
VXG-7 - Workflow example
Unicast / Multicast
VXG-7 allows unicast as well as multicast transmissions. The system requires at least a unidirectional IP-based data link. The data rate is adaptable to the available bandwidth. Lip synchronisation is guaranteed even on transmission errors.
Multiformat encoding
Most broadcasters will want to reach the largest audience by supporting more than one platform with many different bit rates and formats. VXG-7 can encode a high resolution, standard resolution and even a PIP stream at the same time. Encoding profiles can be saved as XML.
Operation Modes
Star-shaped and cascaded distributions are possible. If more than one transmission path is used, VXG-7 will route the data rate through all available channels (multi path) to maximize the overall throughput.
DVB service information
Along with the video, service information (SI/PSI) and teletext data can be transmitted. VXG-7 has an automated format detection for signalizing the outgoing transport stream (WSS). Besides generating all mandatory DVB tables, the VXG-7 encoding software optionally provides PID filtering, stream duplication, restamping and remultiplexing functionality.
VXG-7 - Technical specifications
The VXG-7 streaming solution provides real-time streaming through low-bandwidth connections (e.g. xDSL) based on H.264/AVC. Here are some example specifications:
| INPUT / OUTPUT | |
| Audio / Video | |
| SDI | SMPTE 259M |
| HD-SDI | SMPTE 292M |
| Transport stream | |
| ASI | DVB-ASI (optional) |
| Ethernet | IP Stream (RTMP, RTSP, TS over UDP/RTP/TCP) |
| RF | 8VSB / 16VSB (optional) |
| Resolution and frame rates | |
| SD | 576i @ 25 x 720 480i @ 29.97 x 720, 704 |
| HDV | 720p @ 50, 59.94 x 1280 |
| HDTV | 1080i @ 23.976 | 24 | 2.5 | 29.97 | 30 | 50 | 59.94 | 60fps x 1920 |
| Input signal synchronization | |
| External | Black Burst / Tri-SYNC |
| Output error correction | |
| FEC | Pro-MPEG |
| MPEG-ENCODER | |
| SD video | |
| MPEG-2 | MP @ ML 1 to 15 Mbps 4:2:0 |
| H.264 / AVC | MP @ L3 0.5 to 10 Mbps 4:2:0 |
| HD video | |
| MPEG-2 | MP @ HL 2 to 25 Mbps |
| H.264 / AVC | HP @ L4 1 to 25 Mbps |
| Audio | |
| MPEG-1 Layer II | 32 to 384 kbps |
| AAC-LC | 16 to 576 kbps |
| AAC-HE V1 / V2 | 16 to 128 kbps |
| Dolby® Digital | up to 640 kbps (AC-3 2.0) |
| TS-MULTIPLEXER | |
| Video format | MPEG-2 / H.264 |
| Audio format | MPEG-1 Layer II / AAC / Dolby® Digital |
| Standard | DVB / ATSC |
| SI/PSI insertion | all mandatory DVB tables |
| PSIP insertion | all mandatory ATSC tables |
| Private Data | HbbTV (AIT) Table |
| Teletext | ETSI EN 300 472 |
| EPG | EIT p/f | EIT schedule |
| TS-REMULTIPLEXER (OPTIONAL) | |
| Input sources | DVB ASI / IP / RF |
| Ancillary data | automatic PSI and DVB-SI extraction, regeneration and insertion |
| Table processing | adaptation of PIDs, services, tables and descriptors |
