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View Full Version : Playback issues on MBP 2,2 Core2Duo


rasmusth
August 17th, 2008, 07:26 AM
I made a dedicated user for Boxee on a MBP2,2 Core2Duo and hooked it to my 46" Crystal Samsung LCD. I love the Boxee interface and would like to use it on a Mac Mini 1,8 or 2,0 Core2Duo. However, my MBP doesn't even seem to have the power to play back 720p x264 perfectly through Boxee. I am well aware that the hardware in my MBP is more than enough to theoretically perform this, but it just doesn't - in scenes with considerably high bitrate it chunks, causing the audio to go out and back into sync and the video to slow down and speed up.

What are my options here?

/Rasmus

tsella
September 2nd, 2008, 07:22 AM
well, boxee is doing some magic, but there is limit to what it can do, considering most of the decoding is done in the cpu. if its really high bitrate, we wont be able to play it.

would love to know what sort of results you're getting with vlc or mplayer. if they handle it better than we do, its probably a bug. if not, i doubt we can do anything at this point.

jpeeters
September 3rd, 2008, 05:31 AM
The hardware looks OK to play high-bitrate movies, but take in mind that the (current) implementation of ffmpeg (which mplayer/... is using to decode most of the video formats) is limited to a single core of your processor.

You can try to use coreavc-for-linux, although I do not know if they support Mac OS X yet. And you should integrate it with boxee as well if you want to get this working :)

kn1gh7h4wk
September 3rd, 2008, 08:16 PM
I'm having similar issues too. But strangely, when I first installed it yesterday, the video lag was consistantly only about a second. Today, it becomes increasingly lagged exceeding 30secs. It seems the video begins slowing down like in slow motion. This happens with anything I play, including video streaming from internet. Also, I have no audio on my music anymore. All mp3's and last.fm music shows ts playing, but I hear nothing. Only videos and boxee sound fx are audible. Very strange!

What is the recommended video bitrate for boxee? Currently, my vids are between 1.5 to 2Mbps.

agentlame
September 4th, 2008, 12:51 AM
I would love to do some testing around this, on my GF's MBP... Can anyone recommend a podcast/free video I could test with?

So far, I haven't seen any playback issues (on her notebook, I use a Linux desktop). But I'm not sure the videos we watch on it are of high enough quality. Even some handbreak setting would help. Currently, we use the defaults when ripping DVDs.

tsella
September 4th, 2008, 06:23 AM
you can download a whole slew of samples at http://samples.mplayerhq.hu/

i'm able to play 17mbit avc1 1920x1080 resolution video/a52 6ch 48mhz audio/mkv container/subtitle stream on my 2.0ghz macbook (not pro) and 2gb ram over 802.11g wifi.

at 18mbit audio stutters.

rasmusth
September 9th, 2008, 07:29 AM
you can download a whole slew of samples at http://samples.mplayerhq.hu/

i'm able to play 17mbit avc1 1920x1080 resolution video/a52 6ch 48mhz audio/mkv container/subtitle stream on my 2.0ghz macbook (not pro) and 2gb ram over 802.11g wifi.

at 18mbit audio stutters.

I managed to fix this by opening the lid. I think I'll replace the macbook with a macmini for mediacenter in the coming month. Hopefully apple will pull themselves toghether and offer an upgrade.

This was a heating issue.

/Rasmus

dave
September 10th, 2008, 10:59 AM
I managed to fix this by opening the lid. I think I'll replace the macbook with a macmini for mediacenter in the coming month. Hopefully apple will pull themselves toghether and offer an upgrade.

This was a heating issue.

/Rasmus

We are seeing this a lot on the Mac Air - the second processor shuts down quickly when doing a media decode and the computer slows to a halt. Odd to see MBP's doing it too, but with the lid down, there is no place for that heat to rise!