Jump to navigation Jump to search
# Meeting 2014-12-23 Mumble: mf4.xiph.org:64738 # Agenda - reviews - update1 # Attending xiphmont, derf, unlord, jack, yushin, jmspeex # reviews - 548 and 547 are waiting on feedback # update1 - x: It's ready to go up. I was going to put it on xiph.org and do the standard announcements. Does anyone want to do more than that or are there changes that need to be made? - u: My recollection is that HEVC destroyed all the branches but not it looks ok. - t: It still destroys them somewhat. - x: It got better by about the same amount we got better since the last time we ran metrics. - j: We should measure that against teh AWCY HEVC we currently test against. - u: I didn't notice any particular change when I was eyeballing the graph. - x: We both got better by a noticeable amount. We were consistently better than in July although not by a dramatic amount. It looked like from July we held still and everyone else fell behind. - u: Maybe I'm missing something but HEVC is doing an incredible job in crepuscular on the trees. - x: It's still doing stuff, just less of it. - jm: I think on crepuscular we are beating everyone else. - x: I still think that end of show looks better. But I seem to be judging differently than everyone else. The reason we look better on end of show is that there is a lot more mid frequency content, and we seem to be the only codec that does well there. The other codecs seem to drop the center frequencies. It's a good hack. If you're going to drop a lot of content then that is the place to do it. .In end of show, it's more obvious. - jm: I'm wondering if there is a color conversion issue on end of show. - t: Yeah, it's definitely there. I don't know what happened. Are you using the original PNG file? - x: yes - t: So that's 16bit PNG? - x: I coverted them. I do not have a colorspace problem on mine. Who has color management turned on in Firefox? It's on by default now. - u: How do I change the image in update1? - x: Go to the larger test which is linked, which has a dropdown on the bottom. - t: THe obvious solutoin here is to convert the original images to y4m and back again. - x: I have gfx.colormanagementmode to 0, which is non-default. Let me flip that bit. Holy shit, I see it now with default settings. - t: Also if you convert to y4m it will convert it to 420 instead of 444. - x: I used abcompare, but not sure what it did. I'll have to go look. I bet the original have a colorspace declaration and the others got stripped out by mogrify. I'll figure out why. update: it was the exact opposite in fact: mogrify was adding unwanted colorspace declarations - j: Publishing this on moz research blog too? - x: Not sure how, but I assumed both. - j: I'll see if I can get it to work this afternoon. # bpyramid - t: MPEG2 doesn't seem to have bpyramid stuff. Is that true? - d: Yes. - t: Should we avoid this? Or should I have the bitstream support it but be turned off? - d: I'd want to review stuff before deciding.