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Question about AAC audio format

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Bobby Hall
Question about AAC audio format
on Jun 18, 2015 at 4:15:30 am

I'm converting a video in Mpeg Streamclip that I edited in FCP 7 and for the audio format I chose AAC and for bit rate I wanted to choose 320 kbps, but that option isn't available. The highest rate it offers is 256. I have another program called iMedia Converter that lets me choose 320. Does anyone know why Mpeg Streamclip doesn't offer it? is 320 overkill for AAC? I know it's a standard bit rate for mp3. Thanks for any help!


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David Roth Weiss
Re: Question about AAC audio format
on Jun 18, 2015 at 4:32:19 am

Don't sweat it, the difference in fidelity between those two highly compressed bitrates is negligible. FYI, you should only be using that audio codec for the web, not for anything you will every edit again. Right?

David Roth Weiss
Director/Editor/Colorist
David Weiss Productions


David is a Creative COW contributing editor and a forum host of the Apple Final Cut Pro forum.


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Bobby Hall
Re: Question about AAC audio format
on Jun 18, 2015 at 4:58:09 am

Hi David,
Thanks for the reply. Yes, I'm using this codec just for the web. My camera shoots footage in h.264 with audio format linear pcm. I convert it to prores to edit it, then export and convert it in mpeg streamclip back to h.264 with a bit rate of 15 mbps and the audio to AAC at 192 kbps. I was just curious if 320 kbps would sound better and saw that 256 was as high as it goes, so I wanted to ask if it mattered.

Anyway, those are the settings I use for the web. After that I just delete the converted prores files, and if I ever think I might want to re-create the video for another platform or change the editing, I just keep the original footage from my camera on a hard drive so that I can always convert it to prores again.


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John Rofrano
Re: Question about AAC audio format
on Jun 18, 2015 at 12:26:53 pm

[Bobby Hall] "I convert it to prores to edit it, then export and convert it in mpeg streamclip back to h.264 with a bit rate of 15 mbps and the audio to AAC at 192 kbps."
I'm curious as to why you are wasting time rendering twice instead of rendering your final h.264 directly from your FCP X timeline?

Compressor allows you to select AAC 320 so you could make a custom template exactly the way you want and use it directly from FCP X and save a lot of time.

~jr

http://www.johnrofrano.com
http://www.vasst.com



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Bobby Hall
Re: Question about AAC audio format
on Jun 18, 2015 at 12:37:17 pm

I use FCP 7. I've found that I save a lot of time if I export a non-self contained prores file out of FCP and convert it in mpeg streamclip than using the quicktime conversion in FCP.


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John Rofrano
Re: Question about AAC audio format
on Jun 18, 2015 at 1:23:41 pm

[Bobby Hall] "I've found that I save a lot of time if I export a non-self contained prores file out of FCP and convert it in mpeg streamclip than using the quicktime conversion in FCP."
Ah, OK. got it. Thanks,

~jr

http://www.johnrofrano.com
http://www.vasst.com



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