iOS H264 Encoder Profile and Resolution

[Vishal Dalsania]

Hi,

Where do i set encoder settings for iOS H264 encoder.

RTCVideoEncoderH264.mm says that

The user must initialize the encoder with a resolution and framerate conforming to the selected H264 level regardless.

However, there is no documentation on how to provide that information to encoder.

I am creating encoder via below code

let videoEncoderFactory = RTCDefaultVideoEncoderFactory()

videoEncoderFactory.createEncoder(.init(name: "H264"))

Please help on how to specify H264 high profile and resolution of the video.

Thanks

[Vishal Dalsania]

Anyone ?

[Nagamuni reddy]

What exactly you want to achieve with this?

There are different ways to give encoding methods.. u can just give outside the frame work.. or u can disable inside the source code.. depending on you necessity.!

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[Vishal Dalsania]

I am trying to screencast and framework automatically selects H264 Baseline profile on iOS and that fails H264 encoder because frame size is bigger than it can handle.

I want to provide resolution, fps to encoder so it can select correct h264 profile based on resolution and fps combination.

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[Wesley Lee]

Hi, 

when you create capturer, you can set w*h*fps params.

my code snapshot FYI.

//capturer
static int g_used_video_width = 640;
static int g_used_video_height = 480;
//encode
static int g_used_video_fps = 15;
static int g_used_video_maxqp = 30;
...
g_video_capturers = webrtc::VcmCapturer::Create(g_used_video_width, g_used_video_height,g_used_video_fps,cameraId);

webrtc::VideoCodecH264 h264_settings = webrtc::VideoEncoder::GetDefaultH264Settings();
encoder_config.encoder_specific_settings = new rtc::RefCountedObject<webrtc::VideoEncoderConfig::H264EncoderSpecificSettings>(h264_settings);
encoder_config.video_stream_factory = new rtc::RefCountedObject<cricket::EncoderStreamFactory>("H264", g_used_video_maxqp, g_used_video_fps, false, false);

g_video_send_stream = g_call->CreateVideoSendStream(std::move(video_send_config), std::move(encoder_config));
if (g_video_send_stream != nullptr)
{
	RTC_LOG(LS_INFO) << __FUNCTION__ << " , Success!";
	//kDegradationDisabled,kMaintainResolution,kMaintainFramerate,kBalanced,
	g_video_send_stream->SetSource(g_video_capturers, webrtc::VideoSendStream::DegradationPreference::kBalanced);
	return 0;

}

Vishal Dalsania <vishal....@rigelnetworks.com> 于2019年10月9日周三 上午3:47写道：

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[Vishal Dalsania]

This looks like using C++ native code.

Is there any way to specify these in iOS sdk ?

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