Can SCC(Screen content code) be enabled in CONFIG_REALTIME_ONLY building ?

[klaus zhang]

Hello everyone

I've  built libaom with config CONFIG_REALTIME_ONLY,and tried to enable SCC(Screen content code) in scenario of screensharing  through the code as below:

if (codec_settings->mode == VideoCodecMode::kScreensharing) {
      SET_ENCODER_PARAM_OR_RETURN_ERROR(AV1E_SET_TUNE_CONTENT,
                                        AOM_CONTENT_SCREEN);
      SET_ENCODER_PARAM_OR_RETURN_ERROR(AV1E_SET_ENABLE_PALETTE, 1);
  } else {
    SET_ENCODER_PARAM_OR_RETURN_ERROR(AV1E_SET_ENABLE_PALETTE, 0);
  }

However,there's no much quality improved with or without SCC enabled.

I've also noticed that the unit test "${AOM_ROOT}/test/screen_content_test.cc"

 is removed out from the test.cmake,if CONFIG_REALTIME_ONLY was set.

At the mean while ,I've noticed that SCC will be enalbed in scenario of screensharing in the AV1 encoder  within WebRTC either. BTW:code above is the same as that in WebRTC.which makes me more confused.

So this is my question:

Can SCC(Screen content code) be enabled in CONFIG_REALTIME_ONLY building ?

- best regards

[James Zern]

Hi,

On Wed, Dec 7, 2022 at 12:32 AM klaus zhang <asplin...@gmail.com> wrote:

Hello everyone

I've  built libaom with config CONFIG_REALTIME_ONLY,and tried to enable SCC(Screen content code) in scenario of screensharing  through the code as below:

if (codec_settings->mode == VideoCodecMode::kScreensharing) {
      SET_ENCODER_PARAM_OR_RETURN_ERROR(AV1E_SET_TUNE_CONTENT,
                                        AOM_CONTENT_SCREEN);
      SET_ENCODER_PARAM_OR_RETURN_ERROR(AV1E_SET_ENABLE_PALETTE, 1);
  } else {
    SET_ENCODER_PARAM_OR_RETURN_ERROR(AV1E_SET_ENABLE_PALETTE, 0);
  }

However,there's no much quality improved with or without SCC enabled.

I've also noticed that the unit test "${AOM_ROOT}/test/screen_content_test.cc"

 is removed out from the test.cmake,if CONFIG_REALTIME_ONLY was set.

It looks like that test was added without realtime in mind. svc_datarate_test.cc tests this configuration with realtime mode.

 

At the mean while ,I've noticed that SCC will be enalbed in scenario of screensharing in the AV1 encoder  within WebRTC either. BTW:code above is the same as that in WebRTC.which makes me more confused.

So this is my question:

Can SCC(Screen content code) be enabled in CONFIG_REALTIME_ONLY building ?

Yes. As you noted it is used in WebRTC and in Chrome we build with this configuration:
https://source.chromium.org/chromium/chromium/src/+/main:third_party/libaom/cmake_update.sh;l=135;drc=71d4ba91abb70d6ddbc3f4900c7259ef5c7327b3

[klaus zhang]

thanks for your reply.yes,it really can enable scc in WebRTC.