The VideoLAN Forums

Hey all

I'm trying to play an MKV files on OSX, with a52 audi and avc1 video and the video stutters as it plays, missing 90%+ of frames. I've tried the same video on mplayerosx and it plays with stuttering sound...

I've tried the latest nightlies on both 0.86 and 0.9 plus the release version and the 0.8.6 beta all with the same result.

Its a 720p video - other 720p videos (in XviD AVI though) have worked fine...

Any ideas?

avc1 also known as H.264 is much more CPU-intensive than XviD/ordinary previous MPEG4-standards. Thus, it's highly possible that your mac is too slow to play HD-H.264 content, although it may play videos of that size in other formats.
For 720p-H.264 you need at least a 2 GHz single-core-G5 or an Intel-based mac.

avc1 also known as H.264 is much more CPU-intensive than XviD/ordinary previous MPEG4-standards. Thus, it's highly possible that your mac is too slow to play HD-H.264 content, although it may play videos of that size in other formats.
For 720p-H.264 you need at least a 2 GHz single-core-G5 or an Intel-based mac.

Well, I assume this is it then. I'm supprised Mplayer can play it though? Perhaps you can optimize the decoding, one day

I'm using a 2Ghz G5 iMac, so I imagine you need more than that...

Well, I have a 2.08 GHZ AMD CPU. Its all pixelated and stuttery in VLC, but in WMP , the audio is just out of sync (no pixelation, slight stuttering).

I just noticed this thread is in the MAC section but obviously I'm not using a MAC

I have got a g5 quad and VLC drop a lot of frame. It's not a question of hardware.
It's about ffmpeg using multi core, and vlc too.

Buy a PC if you wanna play media, indeed HD.

I know this thread is probably on page 6 but I recently installed Linux (PCLinuxOS). I played an HD video in Windows and it was choppy then played it in Linux and it was fine so maybe the problem (at least in some instances) is Windows and not the PC its installed on. I guess that wouldn't matter with a Mac but I thought I'd mention it.