Online Manual
MSP 325N User Manual
3.4.1 Main/Sub Stream Video Parameters
Main/Sub Stream parameters are typically used for video conferencing or RTMP live streaming.
- The Main Stream is used for high-quality, high-definition main picture transmission and is the core content for viewing.
- The Sub Stream is usually for screen sharing (PPT, documents, etc.) or abackup relatively low-resolution stream switched to when the network is poor.
Resolution
The resolution can be set up to 4K@60Hz.
Encoding Method
- H.264 (AVC): Video encoding standard, balances compression rate and picture quality, good compatibility, suitable for live streaming, video conferencing, etc.
- H.265 (HEVC): An upgrade to H.264, improves compression efficiency by about 50% (lower bitrate at the same quality) but requires stronger hardware support. Suitable for 4K/8K ultra-high-definition video.
📢 **Notes**
Baseline/Main/High encoding cofigurations sequentially provide higher picture quality but requiring slightly higher computational demands.
Bitrate Control
| Mode | Name | Picture Quality | Applicable Scenarios |
|---|---|---|---|
| CBR | Constant Bitrate | Fluctuates greatly, unstable | Network live streaming, video conferencing |
| VBR | Variable Bitrate | High and stable | Local recording, movie encoding |
| AVBR | Adaptive Variable Bitrate | Very high and more stable | Live streaming requiring both quality and network stability |
| FIXQP | Fixed Quantization Parameter | Constant | Video quality testing, extreme quality recording |
GOP (Group of Pictures)
The interval duration between two keyframes, in seconds. Affects video error tolerance and compression efficiency.