How many 1080P25 stream can TX1 transcode?

We use TX1 to transcode(H.264 to H.265).
How many 1080P25 stream can TX1 Support?

For h264 to h265 transcoding, the max capability is four.
https://devtalk.nvidia.com/default/topic/979908/jetson-tx1/gstreamer-transcoding-performance-issue/post/5033461/#5033461