Please support of Gstreamer of Dragonbaord410

I am Hiroshi Hasegawa work with Arrow UEC Japan of IoT business Development office.

We are having discussion with who would like to create product based on DragonBoard 410C.
This opportunity is one of the big bland manufacturers in Japan. Business volume is over $1M
This application is gateway device for IP Camera. Full HD 30fps data from IP camera are flowed with the actual speed.
*1920×1080×32bit colorx30fps=2Gbps

However, we are on the edge of losing the contract because of we do not any information of mitigate the symptom of the playback speed.
The playback speed of Full HD MPEG4 is slower( x0.5)on Linaro LInux 16.09(debian) And also HD MPEG4 is slower( x0.9).
The details are in the post.

We have been contacting Qualcomm Japan. Unfortunately we are not able to have reasonable collaboration with them even from ARM Japan.
We need to answer to the customer within two or three days maximum.
Otherwise, we will lose this business.
We greatly appreciate your help on this matter.