First of all, thank you for submitting this draft! I will be the one working on merging any remaining parts of draft-moffitt-netvc-requirements-00 into your draft.
I have some comments about your draft, organized by section. 2.1. Internet Protocol Television (IPTV) I don't think either error robustness or temporal scalability are necessary here. This sort of content is usually delivered over a reliable network with high latency, like TCP. Also, I would really like to not support interlacing. I would suggest removing the interlaced formats and recommending a deinterlacer be used before encoding. 2.2. Video conferencing I would suggest dropping all of the CIF/SIF/nonsquare pixel formats. 480p and 360p could replace them. 2.3. Video sharing So the main difference between 2.3 and 2.1 seems to be the content source. I would suggest replacing section 2.1 with 2.3 entirely. 2.4. Screencasting It should probably be made clear that these are input formats, but not necessarily what the encoder will run at. I would expect a reasonable encoder to convert RGB to YCbCr or YCgCo internally. In addition, high frame drop is really common for screencasting, for effective frame rates of 15fps or less. 2.5. Game streaming Why is this the only category that requires resolution scalability? 3.1. Basic requirements Is the intent that all decoders should support decoding 8 and 10 bit bitstreams? Also, maybe swap 4:2:2 with 4:4:4, as 4:2:2 isn't in any of the usecases mentioned earlier. 4.1. Compression performance evaluation Are you suggesting running all of the codecs in CBR mode? I don't think this makes sense for many of the applications mentioned earlier. In addition, you are going to need to specify CBR buffer sizes, etc. The equation you give seems to give the rate over the whole file, which I would normally consider VBR. Also, I'm not sure how much of this belongs in this draft versus the testing draft. _______________________________________________ video-codec mailing list [email protected] https://www.ietf.org/mailman/listinfo/video-codec
