Bandwidth of h264 decoder

Hello everyone,
I try to composite 8 h264 30fps fullHD streams from ethernet port to 1 frame and render it.
When input data transfer rate is high(more than 280Mbits), stream’s image become fuzzy.
I think the problem is receiving ability of h264 decoder. My question is blew.
1,What is max data transfer rate h264 decoder can receive?
2,Is there any way to drop frame rate before h264 decoder to reduce data transfer.
3,Is there any way to increase decoder receiving bandwidth. I tried using 2 ethernet ports, but it has no effect.

We have removed certain suspicious links in the post.

Please share how we can reproduce the issue via gstreamer or tegra_multimedia_api.