Exporting as MPEG 4 in Quicktime 6!

Captain Code

Captain Code

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Did anyone else notice that they can export as MPEG 4 in Quicktime 6?

That's sweet.

This is just the free version too. :D

It's taking a LOOOOONNNNGGGG time to export a 4.5 meg qt file to mpeg 4 though. I'll update this thread with the size of the mpeg 4 file after it's done.
 
so, what's the file size :D

as of me, I can't run mp4s , they will just crash (under OS 9)

is it done yet? :rolleyes:

hehe
 
OK, here's the stuff :p

Original file:
Quicktime MOV format
12 fps
22 kbps audio
4.5 MB

Exported file:
MPEG 4 format
12 fps
22 kbps
3.6 MB

Not too bad! 20% file size reduction, and no loss in quality. :D
 
OK, here it is with an MP3 converted to MP4 audio.

MP3:
186kbps
6.9 MB

MP4
192kbps(closest that the bitrate slider will let me get to the original bitrate)
6.9 MB

No difference with the audio files. At least, not this audio file.

Oh well, I await AAC support in Quicktime and iTunes.:p
 
Audio exported to MP4 in QuickTime is AAC audio. Before you export an audio file to MPEG-4 in QuickTime click 'Options' and read the bottom half of the box and you will see that it is AAC.

Also, a 186-kbps AAC file will always be exactly the same size (well, very nearly) as a 186-kbps MP3 file or any other type of 186-kbps file. 186-kbps means 186,000 bits-per-second of post-compression data. In other words, no matter what format of compression your are using, if it says it is 186-kbps then that means for every second of audio it will take up 186,000 bits (or 23,250 bytes) on your harddrive.

A few of us banged our heads together in this thread a while back to try to figure out just that. We figured it out in the last couple posts.

The only exceptions are formats like the Ogg Vorbis algorithm, which has no set rate (it is variable bitrate) and so you have to specify "MP3 128kbps-like quality", etc.

The benefit of AAC audio is not that a 128kbps file will be smaller than a 128kbps MP3 file, the benefit is that a 128kbps AAC file will sound better than a 128kbps MP3 file. So if you are content with how MP3 files sound at 128kbps, you should be quite happy with how AAC files sound at, say, 96kbps and that will save you disk space. :)
 
Oh yeah -- if you want to experiment with the quality level of AAC audio, make sure you convert from an AIFF file from a CD or something. If you convert a 192kbps MP3 file into a 360kbps AAC file the AAC file, of course, still won't sound any better than the original MP3 file. ;)
 
Originally posted by jeb1138
Audio exported to MP4 in QuickTime is AAC audio. Before you export an audio file to MPEG-4 in QuickTime click 'Options' and read the bottom half of the box and you will see that it is AAC.
...
Click to expand...

Right, that does make sense. :p
BUT, then what about the MPEG 4 video? Same settings, but it results in a smaller file...


Oh yeah -- if you want to experiment with the quality level of AAC audio, make sure you convert from an AIFF file from a CD or something. If you convert a 192kbps MP3 file into a 360kbps AAC file the AAC file, of course, still won't sound any better than the original MP3 file.
Click to expand...

Well, of course!:p
 
I just did my own test with MP3 --> MP4. I converted a 192kbps, 5.4 MB mp3 file to MP4 at 128kbps. The results were great!!! The MP4 file was 3.8MB and I couldn't hear any difference!:D

I can't wait for the iTunes and iPod software updates!
 
What the!?

I just dropped that MP4 file into iTunes and it started playing. I thought iTunes didn't support AAC yet. Or was it that AAC dosen't support tags yet?
 
I hate the fact that Apple left their OS 9 support, but it's very comprehensive .. so I won't blame them for it
 
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