Mac Hardware forum

General discussion

QuickTime to AppleTV Exporter Tests

by ChrisTCC2 / March 22, 2007 2:09 AM PDT

Ok, I just tried the "Export to AppleTV" command in QuickTime Pro 7.1.5 and here are the specs of the resulting file:

.m4v extension

H.264 video codec, 640 x 480 (that was my source file), 24fps ( my source was 24fps)
AAC audio codec, 44.1kHz stereo

Overall file bitrate is 2.2Mbps

So we're at the low low end of DVD quality on the bit rate. I had no option to adjust any settings, so I have to wonder if MPEGStreamclip or Handbrake may offer an update soon to allow us to tinker with settings when we convert files.

Overall, good effort by Apple on the preset, but it would be nice to adjust the settings to get more bits for video, and par the audio down to something like 32kHz AAC at 96 or 128kbps.

I ran an HD test this morning on the Export to AppleTV command in QuickTime Pro.

My source file was a 19 second DVCPRO HD file, 720p, 23.98fps. DVCPRO HD stores files at a resolution of 960x720, and when you play them back, QuickTime Player shapes it at 1248x702 to get the aspect ratio correct.

I ran the exporter, and what I got was a .m4v file. Video was using H.264, at a size of 1248x702, at 23.98fps. Data rate on the video track is 4.85Mbps. Audio was AAC, 44kHz stereo, at 128kbps. That puts the whole file at 4.9Mbps, just under the maximum AppleTV spec data rate of 5Mbps (according to the Apple website)

So it appears that the basic QuickTime exporter does a great job of maximizing available data bandwidth for HD content, when it is given a high quality source such as DVCPRO HD. The resulting video was a bit soft, but most of the detail was there, and I think it would look good on an HD set through the AppleTV.

To update you on the SD test that I did, the video data rate is 2.15Mbps, and the audio was at 128kbps. Not bad, but just at the bottom end of DVD quality. It would be better if the exporter would give standard definition video a higher datarate, such as at least 3.5Mbps, so we could get DVD quality bitrates out of it.

HD results are promising. I'm fairly impressed there.

Let's hope that third parties tie into this exporter, and allow us to up the datarate on video so we can get some better results out of standard definition content.

Overall, I'm fairly impressed.

I was using a G4 MacMini for the exports. I would definitely get an Intel Mini or iMac for all exports. You will have much better export times.

Discussion is locked
You are posting a reply to: QuickTime to AppleTV Exporter Tests
The posting of advertisements, profanity, or personal attacks is prohibited. Please refer to our CNET Forums policies for details. All submitted content is subject to our Terms of Use.
Track this discussion and email me when there are updates

If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.

You are reporting the following post: QuickTime to AppleTV Exporter Tests
This post has been flagged and will be reviewed by our staff. Thank you for helping us maintain CNET's great community.
Sorry, there was a problem flagging this post. Please try again now or at a later time.
If you believe this post is offensive or violates the CNET Forums' Usage policies, you can report it below (this will not automatically remove the post). Once reported, our moderators will be notified and the post will be reviewed.
Popular Forums
Computer Newbies 10,686 discussions
Computer Help 54,365 discussions
Laptops 21,181 discussions
Networking & Wireless 16,313 discussions
Phones 17,137 discussions
Security 31,287 discussions
TVs & Home Theaters 22,101 discussions
Windows 7 8,164 discussions
Windows 10 2,657 discussions


Help, my PC with Windows 10 won't shut down properly

Since upgrading to Windows 10 my computer won't shut down properly. I use the menu button shutdown and the screen goes blank, but the system does not fully shut down. The only way to get it to shut down is to hold the physical power button down till it shuts down. Any suggestions?