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You are here: MacNN Forums > Software - Troubleshooting and Discussion > Applications > Help : Convert MP4 to web friendly file.

Help : Convert MP4 to web friendly file.
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Twister
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Jun 20, 2005, 02:11 PM
 
I have an MP4 (audio and video) file that needs to be compressed for the web. I have QT 7, however whatever I try turns out to be bigger than it started!! Can someone help me figure out the correct encoding or whatever. I was hoping to get it down to something under 20MB.

Thanks
     
Mastrap
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Jun 20, 2005, 02:22 PM
 
How large is the original file?
     
Twister  (op)
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Jun 20, 2005, 02:45 PM
 
640x480 48.5 MBs
     
TETENAL
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Jun 20, 2005, 02:59 PM
 
You need to set the bitrate. Open the movie in QuickTime Player then do File->Export, select MPEG-4 as the file format and click the Options button. There you see the bitrate per second. Let's say your movie is 180 seconds and the bitrate is 256kB/s then the video will take 45 MB. You want it to be 20 MB or 20480 kB and that divided by 180 seconds, so you need a bitrate of 113 kB/s. You have to consider that audio also takes some space, so make it 100 kB/s and it will match more or less (of course you can also calculate and set the bitrate for the audio so you can get it to match better).
     
C.J. Moof
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Jun 20, 2005, 03:08 PM
 
Also, fewer pixels= lower data rate. You can cut the size a lot if you can take the video to 320x240
OS X: Where software installation doesn't require wizards with shields.
     
Twister  (op)
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Jun 20, 2005, 03:52 PM
 
Yes, cutting the height and width by 1/2 is a must. However the bitrate is my missing piece I think. Why can't Apple just make a web setting. Thanks
     
C.J. Moof
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Jun 20, 2005, 03:55 PM
 
Because 28.8K dialup, a DSL line and Verizon Fios are all web connections....
OS X: Where software installation doesn't require wizards with shields.
     
   
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