(2014-07-15 23:48)DocG Wrote:(2014-07-14 01:02)melter Wrote: important for anyone looking to buy a chromebox and plans to watch Hi10p content on it:
I bought the base chromebox (Celeron 2955U) a few weeks ago and have ran into issues with Hi10p content. I watch alot of 1080p Hi10p encoded anime, and the problem arises with scenes where there is a "film grain" effect (during flashbacks for example in "Another - Episode 10") this only happens on SOME anime, mostly with larger file size episodes (more reference frames maybe?). Anyway, the video just stops to buffer for 30 seconds, continues play back for 10-20 seconds, then stops to buffer again. As soon as the film grain flashback ends, playback continues smoothly.
CPU usage is about 50% during regular scenes and 80%-98% during scenes with film grain. Memory usage remains below 20% (I added a second 2GB stick of RAM for total of 4GB), and I am also playing from a USB 3.0 connected HDD (which I also tested on my Desktop PC and had no issues); so I am sure this problem is caused by the CPU.
Thanks for the info. I mustn't have watched anything with grain yet, but I'll test Underwater's Another Episode 10 (will be streaming directly off my NAS, though).
Edit: Ran through the file a few times, and the maximum number of drops I had was 6. Yes, 6! Generally a couple right at the beginning, and then a few more during the OP when the picture has a lot of grain. That also seems to be the only time where fps wander a bit, otherwise it's a stable 23.98 all the way through. During some scenes I see one of the cores jump to 100%, but without affecting fps and without causing any further drops. Subjectively, I'd have to say the file played absolutely fine. Definitely no stopping and buffering anywhere. Could this be caused by something else, and not the CPU?
P.S. I'm running that particular Chromebox (Asus with 4GB RAM) in dual-boot with Chrome OS and OpenELEC 4.0.7.
Ok, I did some more testing, and found some interesting reults:
When I first boot my chromebox (again, OpenELEC 4.0.7), and play the video (Another Episode 10 - filmgrain scene), it plays perfectly smooth. However, after I play some other random Anime/Movies, when I go back to the Another Episode I get the buffering problem.
Could this be related to the temperature of the CPU increasing causing it to throttle? Or something else entirely?