CODEWITHSUNDEEP
h.264ms-media-foundation
lost_guadelenn
lost_guadelenn

Reputation: 447

Media Foundation h264 encoder bad quality on dynamic scenes

I'm writing an application which records PC's screen in realtime and encodes it with Media Foundation h264 codec. The quality of a resulting video stays high if a picture on the screen doesn't have many dynamic changes. If a picture has many dynamic changes (fast scrolling of a web page, for example) then video quality becomes very low. This sounds like a low bitrate problem, but reference OSX recording application works fine with the same settings.

Codec configuration:

To maximize quality, I configured codec with the following parameters:

Unfortunately, this doesn't help much. The only setting that has the real effect is bitrate.

An example video, that demonstrates the problem: https://www.dropbox.com/s/b26odaeyaygxigo/10-22-2016_15.08.17.mp4?dl=1

Upvotes: 3

Views: 1487

Answers (1)

LYG
LYG

Reputation: 1

you need to set bit rate and quality by this step:

VARIANT controlModeVar;
InitVariantFromUInt32(eAVEncCommonRateControlMode_GlobalVBR,
&controlModeVar);
hr = CodeApi->SetValue(&CODECAPI_AVEncCommonRateControlMode, 
&controlModeVar);
VARIANT quality;
InitVariantFromUInt32(BitRate, &quality);
hr = CodeApi->SetValue(&CODECAPI_AVEncCommonMeanBitRate, 
&quality);

InitVariantFromUInt32(eAVEncCommonRateControlMode_Quality, 
&controlModeVar);
hr = CodeApi->SetValue(&CODECAPI_AVEncCommonRateControlMode, 
&controlModeVar);
InitVariantFromUInt32(H264QualityLevel, &quality);
hr = CodeApi->SetValue(&CODECAPI_AVEncCommonQuality, &quality);

the min os require windows8.

Upvotes: 0

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