Extremely high CPU usage on VP9.

[josh....@frozenmountain.com]

Hey all,

I'm working on a RTC application and I'm attempting to implement VP9 in addition to our existing VP8 implementation.

I've rebuild libvpx with VP9 support  and changed the encoder and decoder to use vpx_codec_vp9_cx and vpx_codec_vp9_dx respectively.

However, using the same parameters as VP8, VP9 takes nearly a second to encode a single frame and has a extremely high CPU utilization (above 90%).

I've profiled the application and traced the CPU utilization to rd_pick_partition but I am unsure how to proceed.

I imagine one of the existing parameters from VP8 might be causing it but they look sane to me.

Below are the config values used. What am I doing wrong?

config->g_timebase.num = 1;

config->g_timebase.den = 30;

config->rc_target_bitrate = 256;

config->rc_end_usage = VPX_CBR;

config->g_w = 640;

config->g_h = 480;

config->kf_mode = VPX_KF_AUTO;

config->kf_min_dist = context->config->kf_max_dist = context->config->g_timebase.den * 60; // 1 per min @ 30fps

config->g_error_resilient = 1;

config->g_lag_in_frames = 0;

config->g_pass = VPX_RC_ONE_PASS;

config->rc_min_quantizer = 0;

config->rc_max_quantizer = 47;

config->g_profile = 0;

Thanks in advance.

[James Zern]

Hi,

On Wed, Aug 10, 2016 at 2:44 PM, <josh....@frozenmountain.com> wrote:

Hey all,

I'm working on a RTC application and I'm attempting to implement VP9 in addition to our existing VP8 implementation.

I've rebuild libvpx with VP9 support  and changed the encoder and decoder to use vpx_codec_vp9_cx and vpx_codec_vp9_dx respectively.

However, using the same parameters as VP8, VP9 takes nearly a second to encode a single frame and has a extremely high CPU utilization (above 90%).

I've profiled the application and traced the CPU utilization to rd_pick_partition but I am unsure how to proceed.

I imagine one of the existing parameters from VP8 might be causing it but they look sane to me.

Below are the config values used. What am I doing wrong?

The first thing to try would be to set VP8E_SET_CPUUSED to something between 5-8 (lower will improve quality at the cost of speed) and make sure you're setting VPX_DL_REALTIME when calling vpx_codec_encode().

 

config->g_timebase.num = 1;

config->g_timebase.den = 30;

config->rc_target_bitrate = 256;

config->rc_end_usage = VPX_CBR;

config->g_w = 640;

config->g_h = 480;

config->kf_mode = VPX_KF_AUTO;

config->kf_min_dist = context->config->kf_max_dist = context->config->g_timebase.den * 60; // 1 per min @ 30fps

config->g_error_resilient = 1;

config->g_lag_in_frames = 0;

config->g_pass = VPX_RC_ONE_PASS;

config->rc_min_quantizer = 0;

config->rc_max_quantizer = 47;

config->g_profile = 0;

Thanks in advance.

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[josh....@frozenmountain.com]

We were already using 'VPX_DL_REALTIME' but it looks like 'VP8E_SET_CPUUSED' did the trick. CPU is still very high but at least its real time now.

Cheers,

Josh

Hi,

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[naveen...@gmail.com]

Same problem i'm getting.
Im using...
rc_target_bitrate = 1000
VPX_DL_REALTIME for vpx_codec_encode
and --cpu-used = 8
cpu usage is <40%

Help me to solve this problem.
Thanks in advance

[James Zern]

Hi,

On Wed, Nov 30, 2016 at 6:06 AM, <naveen...@gmail.com> wrote:

Same problem i'm getting.
Im using...
rc_target_bitrate = 1000
VPX_DL_REALTIME for vpx_codec_encode
and --cpu-used = 8
cpu usage is <40%

VP8 and VP9 support threads which should speed things up and increase the utilization, try setting --threads/g_thread to 2 or 4 depending on your hardware.

 

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[naveen...@gmail.com]

Thanks for ur reply.....


I'm already using g_thread = 4. But the cpu utilization does not decreases.

I'm having one more doubt....

When we use rc_target_bitrate=2000 and  running through vp9 hardware, android crashes.
For the value rc_target_bitrate=256, it does not crashes and it gives low quality.

Is there any way to get high quality and without android crash??


thanks

Hi,

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