Setting H264 ICodec properties in Metro (Modern) interface through an IMFMediaSink/IMFStreamSink pair.

Question

Hello,
I'm trying to set some properties (CODECAPI_AVEncCommonRateControlMode and CODECAPI_AVEncCommonQuality), but I'm not sure how to do it. I tried to set them through the media type, but they seem to get ignored by the system (I tried with 1 and 100 of
quality, but the quality didn't change at ALL) :
12120,2B54 18:22:32.20885 CMFTransformDetours::SetOutputType @0000001F7B346958 Succeeded MT: MF_MT_FRAME_SIZE=8246337209400 (1920,1080);{1C0608E9-370C-4710-8A58-CB6181C42423}=3;MF_MT_AVG_BITRATE=2048000;MF_MT_MPEG_SEQUENCE_HEADER=00 00 00 01 67 64 00 28
ac 2b 40 3c 01 13 f2 e0 22 00 00 03 00 02 00 00 03 00 78 1b 41 10 8d 40 00 00 00 01 68 ce 3c 30 ;MF_MT_MAJOR_TYPE=MEDIATYPE_Video;MF_MT_MPEG2_PROFILE=100;MF_MT_FRAME_RATE=128849018881 (30,1);MF_MT_PIXEL_ASPECT_RATIO=4294967297 (1,1);MF_MT_INTERLACE_MODE=2;MF_MT_SUBTYPE=MEDIASUBTYPE_H264;{FCBF57A3-7EA5-4B0C-9644-69B40C39C391}=1 
12120,2B54 18:22:32.20886 CMFTransformDetours::SetOutputType @0000001F7B346958 - exit 
12120,2B54 18:22:32.20887 CMFTransformDetours::SetInputType @0000001F7B346958 - enter 
12120,2B54 18:22:32.20891 CMFTransformDetours::SetInputType @0000001F7B346958 Succeeded MT: MF_MT_FRAME_SIZE=8246337209400 (1920,1080);MF_MT_COMPRESSED=0;MF_MT_MAJOR_TYPE=MEDIATYPE_Video;MF_MT_AM_FORMAT_TYPE=FORMAT_VideoInfo;MF_MT_FIXED_SIZE_SAMPLES=1;MF_MT_FRAME_RATE=128849018881
(30,1);MF_MT_PIXEL_ASPECT_RATIO=4294967297 (1,1);MF_MT_ALL_SAMPLES_INDEPENDENT=1;MF_MT_FRAME_RATE_RANGE_MIN=128849018881 (30,1);MF_MT_INTERLACE_MODE=2;MF_MT_FRAME_RATE_RANGE_MAX=128849018881 (30,1);MF_MT_SUBTYPE=MFVideoFormat_YUY2 
12120,2B54 18:22:32.20891 CMFTransformDetours::SetInputType @0000001F7B346958 - exit 
This is the output captured by mftrace. What am I doing wrong? What is the correct way to set these properties (that are marked as compatible with the Metro interface)
Thank you!

Answer 1

Hello James,
Let's go with an example. 
https://msdn.microsoft.com/en-us/library/windows/desktop/dd317841(v=vs.85).aspx
https://msdn.microsoft.com/en-us/library/windows/desktop/dd317842(v=vs.85).aspx
I want to be able to set these two properties in my MediaEncodingProfile in order to switch from a bitrate based encoding to a quality based encoding. Both properties are marked in the documentation as compatible with Windows Store Apps so they should work
right?
Following your example I set them in the video MediaPropertySet as 
MediaPropertySet^ set = mediaEncodingProperties->Properties;
set->Insert(CODECAPI_AVEncCommonRateControlMode, (int)eAVEncCommonRateControlMode_Quality);
set->Insert(CODECAPI_AVEncCommonQuality, 1);
Quality 1 because I want to be sure that they're working. The default is 70 so the quality should be really low and visible.
Then I call (as usual)
mediaCapture.StartRecordToCustomSinkAsync(encodingProfile, mfExtension);
But I still get a bitrate based encoding. What am I doing wrong?
Thank you,
C13