TDA4VM: It took more than 1 seconds when I encode my first frame.

Wang Haoyu

Prodigy 80 points

Part Number: TDA4VM

I created a graph with encoder node like this.

node_encode = tivxVideoEncoderNode(graph,

configuration_obj,

nv12_image,

bitstream_obj);

When I first call vxProcessGraph(graph) , it takes about 1.3 second to encode my first frame .

It seems that this time consumption is not normal. I didn't see anything like this in other graph without an encoder node.

What is the reason for this time consumption? Is there a way to avoid this time consumption?

over 4 years ago

0 Lucas Weaver over 4 years ago

TI__Genius 13845 points

Hello,

Which SDK version are you using?

Regards,

Lucas

0 Wang Haoyu over 4 years ago in reply to Lucas Weaver

Prodigy 80 points

7.2SDK

0 Lucas Weaver over 4 years ago in reply to Wang Haoyu

TI__Genius 13845 points

Hello,

There was an optimization done in the 7.3 SDK which should take care of this. Can you migrate to the 7.3 SDK?

Regards,

Lucas

0 Wang Haoyu over 4 years ago in reply to Lucas Weaver

Prodigy 80 points

Hello,

We have not decided to migrate to 7.3 SDK .Can you help me to figure out how much it's improved in SDK 7.3.

I encode a bitstream in size of 1920 * 1080.

Regards,

Wang

0 Lucas Weaver over 4 years ago in reply to Wang Haoyu

TI__Genius 13845 points

Hello Wang,

Very sorry for the delay. After discussing with our internal team, I realized that I was mistaken on the optimizations made in 7.3. These optimizations only applied to decoder and not encoder. The performance will be the same in 7.3 as with 7.2 SDK.

Regards,

Lucas

0 Jesse Villarreal over 4 years ago in reply to Lucas Weaver

TI__Expert 5555 points

Did you can vxVerifyGraph(graph) before calling vxProcessGraph(graph)? If not, can you try calling that first, and reprofiling the vxProcessGraph? The reason I ask is because if you don't call vxVerifyGraph(graph), then the vxProcessGraph(graph) internally calls that to set everything up. I want to see if this 1.3 seconds is mainly from vxVerifyGraph(graph) or vxProcessGraph(graph) for the first frame.

0 Wang Haoyu over 4 years ago in reply to Jesse Villarreal

Prodigy 80 points

Hello Jesse,

I called vxVerifyGraph(graph) before calling vxProcessGraph(graph).I think it is mainly from vxProcessGraph(graph) for the first frame.

Regrads,

Wang

0 Wang Haoyu over 4 years ago in reply to Lucas Weaver

Prodigy 80 points

Hello Lucas,

Thank you. It helps me a lot.

Regrads,

Wang

0 Lucas Weaver over 4 years ago in reply to Wang Haoyu

TI__Genius 13845 points

Hello Wang,

This is TI's last SDK release supporting RTOS-based encoder, as next release this will no longer be supported.

Since the full SDK is open source, you are welcome to view the source for this at tiovx/kernels_j7/hwa/venc/vx_video_encoder_target.c and make any modifications to improve the initial latency.

Regards,

Lucas

0 Wang Haoyu over 4 years ago in reply to Lucas Weaver

Prodigy 80 points

Hello Lucas,

Sorry, I haven't responded to this question for so long.

I have read tiovx/kernels_j7/hwa/venc/vx_video_encoder_target.c. And I don't think the latency can be simply reduced by modify this file since it mainly depends on mm_enc to call the encoder.

Regards