Problem playing newer 720p files (1080p works fine)

[twoplustwo]

I'm having an odd problem with newer downloaded 720p mkv files. I've been playing 720p and 1080p mkv files with KMPlayer on my HTPC for over 2 years without any issues. Over the past few months, almost all the 720p video I download is very pixelated during playback. My old 720p and 1080p files still playback just fine, only the newer stuff is pixelated. I have made zero changes to my HTPC hardware or software configurations. I'm at a loss here..

Here are a few examples (using MediaInfo) of files that are very pixelated during playback:

File 1 - 720p


File 2 - 720p


Here are a few examples of files that play just fine during playback:

File 1 - 1080p


File 2 - 720p


Any ideas? I'm hoping someone can see something that I'm obviously overlooking.

[twoplustwo]

FYI - I just tried updating KMPlayer to the latest version, still have the same problem. I then uninstalled the ATI Catalyst drivers, and reinstalled the latest version of it, still no change. This is frustrating!

[poisondeathray]

your screenshots have cut off the encoding settings, copy & paste text would have been a better idea

a common culptrit for this with some decoders is weightp. weightp was introduced a few months ago into the main branch of x264. some decoders have issues with weightp - pixellated playback, you can try external decoder config in kmplayer or other software e.g. mpchc, mpc+ffdshow, vlc

[twoplustwo]

your screenshots have cut off the encoding settings, copy & paste text would have been a better idea

a common culptrit for this with some decoders is weightp. weightp was introduced a few months ago into the main branch of x264. some decoders have issues with weightp - pixellated playback, you can try external decoder config in kmplayer or other software e.g. mpchc, mpc+ffdshow, vlc

I just googled weightp, and came up with what I think might be the issue. I'll try a few things when I get home tonight.

I'll keep the copy/paste in mind for next time.. Thanks.

[twoplustwo]

Problem fixed!! All I did was upgrade CoreAVC to the latest version.

[poisondeathray]

yes, coreavc 1.x has the weightp decoding bug

versions 2.x are fine

ffdshow and divx h.264 are fine too, and free alternatives to coreavc (divx h.264 is actually faster for decoding)