M4000 quadro card simultaneous h264 encode sessions

[muroturko]

Hello Dev from Nvidia,

i have spoken from livechat with Younus he advised me to open a ticket here to ask developers about my question.

my question is this

how many h264 simultaneous sessions at 1080p 30fps can handle 1x M4000 quadro card
and if i want to use in paralel with sli (2x M4000 card) how many sessions are able to encode?

[anon56509511]

I am not from Nvidia. But I give you some hints:

• 1x M4000 (GM204) has 2 encoders (Maxwell Gen2). The encoder is utilized by one stream ( eg. you must have minimum two streams to utilize both ), see - https://developer.nvidia.com/video-encode-decode-gpu-support-matrix
• The performance of encoder depends on required quality and encoded size, see - page 9 https://developer.nvidia.com/nvenc-application-note or "detailed" https://developer.nvidia.com/nvidia-video-codec-sdk#NVENCPerf
• The limit can be also memory size and bandwidth that depends on frame size, number of buffers and number of reference pictures.
• M4000 core clock 800Mhz is lower (#uderclocked) to achieve less TDP (120W) vs. M5000 core clock 1050Mhz, but NVidia shows no performance difference between M4000/M5000, see "detailed list" https://developer.nvidia.com/nvidia-video-codec-sdk#NVENCPerf. #uderclocked ratio is estimated and unverified, see https://en.wikipedia.org/wiki/List_of_Nvidia_graphics_processing_units.

1x M4000 = 430 FPS (Maxwell Gen 2, High Performance, Constant QP, 1920x1080, YUV4:2:0, 8 bit) * 2 encoders * 0.8 #underclocked M4000 = 688 FPS / 30 FPS per stream = less then 23 high performance streams.

[muroturko]

hi mcerveny thanks for reply.

but i mean how many 720p/1080 streams i can encode on 2mbps

raw format streams are about 6000 kbps and 9000 kbps i want re encode this to at 2000 - 3000 kbps
gpu based instead of using cpu. i can now do 7x 720p on i7 4the gen cpu on cpu based.

1x M4000 = 430 FPS (Maxwell Gen 2, High Performance, Constant QP, 1920x1080, YUV4:2:0, 8 bit) * 2 encoders * 0.8 #underclocked M4000 = 688 FPS / 30 FPS per stream = less then 23 high performance streams.

do you mean i can encode 20 1080p streams in high performance with one m4000?

[anon56509511]

but i mean how many 720p/1080 streams i can encode on 2mbps
raw format streams are about 6000 kbps and 9000 kbps i want re encode this to at 2000 - 3000 kbps
gpu based instead of using cpu. i can now do 7x 720p on i7 4the gen cpu on cpu based.

You need decode and encode ? No problem, even decoder is accelerated (see the same referred materials/links - https://developer.nvidia.com/nvidia-video-codec-sdk). M4000 (Maxwell Gen 2, 1 decoder) decodes 392 FPS H264/1080p (https://developer.nvidia.com/nvdec-application-note)). You can study Video Codec SDK samples too. The encoder supports setup of CBR or VBR (bitrates) that influences quality (search https://developer.nvidia.com/nvenc-programming-guide).

do you mean i can encode 20 1080p streams in high performance with one m4000?

Yes and it depends (see referred materials/links). 1080p30 streams - encode ~20x / decode ~10x.

[muroturko]

hi mcerveny thanks for your response (y)