Saving m4a or m4v as new file at double speed

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Saving m4a or m4v as new file at double speed

Hi - I know I can listen to or watch an m4a or m4v file at double speed in QT7 using the A/V controls, but is there a way that I can save as or export the file at double speed? I want to be able to replay it at double speed on my ipod.

Thanks

15" 2.5 Ghz MBP, Mac OS X (10.6.3)

Posted on Jun 12, 2010 6:13 AM

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Answer 1

Jun 12, 2010 7:40 AM in response to Just Askin

"Add Scaled" via QuickTime Pro to an existing file of half the source file duration.
A 30 second video added (scaled) to a ten second audio track would play at three times the speed when "extracted".

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Answer 2

Just Askin Author

Level 1

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Jun 12, 2010 11:07 AM in response to QuickTimeKirk

Done & done. Thanks for the help!

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Answer 3

Just Askin Author

Level 1

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Jun 13, 2010 9:38 AM in response to Just Askin

I'm afraid I may have spoken too soon. While the file plays at double speed when I open it in Quicktime, when I drag the .mov file to iTunes, it plays at the normal speed again. I'm guessing that the instructions to play at 200% are part of the Quicktime program itself. Is there any way to have them "embedded" into the file so that a 4 minute video and audio becomes a 2 minute video and audio no matter what program you open it in?

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Answer 4

Jun 13, 2010 11:02 AM in response to Just Askin

If you used QuickTime Player Pro and extracted the edited track (or deleted the audio track you added to) then you would have a new file.
You "Save As" to make a new file. This new file would play at double speed in any other application.

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Answer 5

Just Askin Author

Level 1

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Jun 14, 2010 8:36 PM in response to QuickTimeKirk

Hi, Kirk - I really appreciate the help and I'm usually not so dense when it comes to instructions. I'm using Quicktime version 7.6.6 and it says "Pro" on the logo, so I'm guessing I've got the right version. However, I'm not seeing any "extract" command. What I'm doing is using "open file" to open an non drg video. I can double speed it by using the A/V controls. I see an "Add to Selection and Scale" option, but when I choose that and move the marker in to reduce the size by half and then trim to selection, I lose half the video. Thanks for your continued patience.

Regards,

Kevin

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Answer 6

Jun 14, 2010 10:11 PM in response to Just Askin

A/V control settings are not saved with the file except for playback in QuickTime Player (and only that machine).
In order to "trick" the QuickTime Player app to play the fie at double (or any other speed) you need to make a new file. You do this by adding (scaled) your source file with a "dummy" file.
The dummy file represents the "time" you wish for the source file to display at your desired playback speed. I use audio only files to keep things simple.
Once you add (Scaled) to a shorter duration the video and audio tracks will playback at a different speed.
You "extract" via the Movie Properties window of QuickTime Player Pro.

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Answer 7

Just Askin Author

Level 1

8 points

Jun 15, 2010 4:59 AM in response to QuickTimeKirk

Thanks, Kirk - I found the extract and was able to save the audio and video at double speed. The only complication I've got now is that the pitch is very different in the .mov version, which slows the speed but maintains the pitch, and the exported for ipod version, which sounds like the chipmunks. Is there any way to preserve the pitch settings from QT to the exported file?

Regards,

Kevin

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