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Strawman proposal for expressing encoding limits in CLUE

Strawman proposal for expressing encoding limits in CLUE. Robert Hansen IETF88. Offer SDP and Advertisment. Offer SDP. CLUE ADVERTISEMENT. m=video ... ... H264@720p30 a= label:A a= sendrecv m=video ... ... H264@720p30 a= label:B a= sendrecv m=video ... ... H264@720p30 a= label:C

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Strawman proposal for expressing encoding limits in CLUE

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  1. Strawman proposal for expressing encoding limits in CLUE Robert Hansen IETF88

  2. Offer SDP and Advertisment Offer SDP CLUE ADVERTISEMENT m=video ... ... H264@720p30 a=label:A a=sendrecv m=video ... ... H264@720p30 a=label:B a=sendrecv m=video ... ... H264@720p30 a=label:C a=sendrecv Capture Scene 1: Capture 1: Left (Encoding Group 1) Capture 2: Center (Encoding Group 1) Capture 3: Right (Encoding Group 1) Capture 4: Switched Capture Scene Entry 1: 1,2,3 Capture Scene Entry 2: 4 Simultaneous Sets: 1,2,3,4 Encoding Group 1: Encoding Limits

  3. Aim • Encoding limits are only guides to allow the receiver to make a sensible decision about subdivision of resources • Uses simple, codec-independent values • Defines supported codecs, allows different limits for different codecs

  4. Proposal Video encoding: 1 of encodingId (string) 1 of encodingLabel (string) 1+ of encodingLimits: 1+ of codecType (string) 0-1 of maxBandwidth (integer) 0-1 of maxWidth (integer) 0-1 of maxHeight (integer) 0-1 of maxFramerate (integer)

  5. Example #1 <encoding id=“1“ type=“video”> <label>ENC1</label> <limits> <codec>H264/90000</codec> <codec>VP8/90000</codec> <maxBandwidth>4000000</maxBandwidth> <maxWidth>1920</maxWidth> <maxHeight>1088</maxHeight> <maxFramerate>30.00</maxFrameRate> </limits> </encoding>

  6. Example #1 <encoding id=“1“ type=“video”> <label>ENC1</label> <limits> <codec>H264/90000</codec> <codec>VP8/90000</codec> <maxBandwidth>4000000</maxBandwidth> <maxWidth>1920</maxWidth> <maxHeight>1088</maxHeight> <maxFramerate>30.00</maxFrameRate> </limits> </encoding> m=video ... … a=label:ENC1 a=sendrecv

  7. Example #1 <encoding id=“1“ type=“video”> <label>ENC1</label> <limits> <codec>H264/90000</codec> <codec>VP8/90000</codec> <maxBandwidth>4000000</maxBandwidth> <maxWidth>1920</maxWidth> <maxHeight>1088</maxHeight> <maxFramerate>30.00</maxFrameRate> </limits> </encoding> m=video ... … a=label:ENC1 a=sendrecv

  8. Example #1 <encoding id=“1“ type=“video”> <label>ENC1</label> <limits> <codec>H264/90000</codec> <codec>VP8/90000</codec> <maxBandwidth>4000000</maxBandwidth> <maxWidth>1920</maxWidth> <maxHeight>1088</maxHeight> <maxFramerate>30.00</maxFrameRate> </limits> </encoding> m=video ... … a=label:ENC1 a=sendrecv

  9. Example #2 <encoding id=“1“ type=“video”> <label>ENC1</label> <limits> <codec>H264/90000</codec> <codec>VP8/90000</codec> <maxWidth>1920</maxWidth> <maxHeight>1088</maxHeight> <maxFramerate>30.00</maxFrameRate> </limits> <limits> <codec>H265/90000</codec> <maxWidth>1280</maxWidth> <maxHeight>720</maxHeight> <maxFramerate>30.00</maxFrameRate> </limist> </encoding>

  10. Determination • Do we believe that this simple syntax (or something like it) is sufficient to allow the media consumer to sensibly allocate its decode resources? • Do we believe the benefits of this method (fewer m-lines, fewer O/As, less need to precommit resources) justify doing this in CLUE rather than SDP?

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