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Voice
Feb 4, 2011, 11:12 PM
Hello all,

I have a couple movies that are in MP4 container in H264/AAC format. They are around 3000 in video bitrate and in 720p. Both are imported into iTunes as well. When I try to play these movies on my laptop they are choppy and unwatchable. However, when I airplay them to my ATV2 they play flawlessly. Is this just the case of my computer not being able to handle that bitrate? Is it really that much less of a stress on my laptop to stream the movies over to the ATV2 instead of playing them?

Thanks in advance. Great forum here.



SFStateStudent
Feb 4, 2011, 11:19 PM
Hello all,

I have a couple movies that are in MP4 container in H264/AAC format. They are around 3000 in video bitrate and in 720p. Both are imported into iTunes as well. When I try to play these movies on my laptop they are choppy and unwatchable. However, when I airplay them to my ATV2 they play flawlessly. Is this just the case of my computer not being able to handle that bitrate? Is it really that much less of a stress on my laptop to stream the movies over to the ATV2 instead of playing them?

Thanks in advance. Great forum here.

Ran into same situation and went out and bought ATV2 today and bypass that problem...

Voice
Feb 5, 2011, 12:51 AM
I'm unsure what you mean. I already have an ATV2. Just wondering why these movies are choppy on my laptop, but not on my ATV2 when they are streamed from the same laptop.

tropic10
Feb 8, 2011, 11:12 AM
I'm unsure what you mean. I already have an ATV2. Just wondering why these movies are choppy on my laptop, but not on my ATV2 when they are streamed from the same laptop.

What type of laptop and CPU do you have? H264 720p decoding on older laptops can be CPU intensive.

The ATV2 can easily handle 720p content. When you stream your movies, the ATV2 handles all of the decoding.

Voice
Feb 9, 2011, 12:01 AM
I have an older work laptop...running XP, Intel Core Duo, 1.99Ghz, 2 gigs of RAM.

Any idea of ballpark minimums would be to handle 720p?

Also, since I'm asking...how much does bitrate matter in encodes of Blurays? For example, if I encode my bluerays to m4v is there a difference between 2000, 4000, 6000?

Thanks again for the time.

tropic10
Feb 9, 2011, 09:36 AM
I can't comment on specific bitrates since I always use constant quality with Handbrake with an RF of around 22 for 720p encodes. That way Handbrake can adjust the bitrate depending on the complexity of the scene.

A 2 GHz Core Duo should be able to handle most 720p content although it would probably struggle with 1080p. Are you only using iTunes to play back the movies? Can you try playing a movie with the latest version of VLC?

Voice
Feb 9, 2011, 12:19 PM
to play them exclusively from there. I will DL VLC and try that. Is VLC that much more efficient at decoding?

tropic10
Feb 9, 2011, 01:50 PM
VLC can use hardware acceleration in Windows which would offload the video decoding from your CPU to your graphics processor/GPU. But I don't know if your graphics processor is supported. It's worth trying to see if it helps.