How to speed up video files?
April 23, 2009 1:53 PM
How do I speed up AVI video files by 35% ?
I use an audio editing app called GoldWave to speed up MP3s (great for podcasts). Using the "Time Warp" effect, I can increase the tempo while keeping the pitch the same (so people don't sound like chipmunks).
Is it possible to do this with videos?
I use an audio editing app called GoldWave to speed up MP3s (great for podcasts). Using the "Time Warp" effect, I can increase the tempo while keeping the pitch the same (so people don't sound like chipmunks).
Is it possible to do this with videos?
VLC and Media Player Classic (Home Cinema, or not) do this, and Mplayer should as well.
posted by Inspector.Gadget at 2:22 PM on April 23, 2009
posted by Inspector.Gadget at 2:22 PM on April 23, 2009
You can do this with VirtualDub and Audacity/GoldWave. It is not a one step process.
It goes something like this:
1 Open your video in VirtualDub
2 File> Export> Raw Audio and export the audio
3 Video> Frame Rate> look at the current frame rate number, and calculate what a 35% increase would be. Change the frame rate to that. (If your frame rate is 25fps change it to 34 fps)
4 Video> Direct Stream Copy
5 Audio> No Audio
6 File> Save as AVI
7 Open your new AVI and see how long it is (down to the millisecond).
8 Use Audacity/GoldWave to change the length of your exported audio to the length of the AVI.
9 Open your new faster AVI in VirtualDub
10 Audio> Audio From Other File select the new faster audio track.
11 Video> Direct Stream Copy
12 6 File> Save as AVI
(You will probably have to play with this to make it work perfectly.)
posted by gregr at 2:35 PM on April 23, 2009
It goes something like this:
1 Open your video in VirtualDub
2 File> Export> Raw Audio and export the audio
3 Video> Frame Rate> look at the current frame rate number, and calculate what a 35% increase would be. Change the frame rate to that. (If your frame rate is 25fps change it to 34 fps)
4 Video> Direct Stream Copy
5 Audio> No Audio
6 File> Save as AVI
7 Open your new AVI and see how long it is (down to the millisecond).
8 Use Audacity/GoldWave to change the length of your exported audio to the length of the AVI.
9 Open your new faster AVI in VirtualDub
10 Audio> Audio From Other File select the new faster audio track.
11 Video> Direct Stream Copy
12 6 File> Save as AVI
(You will probably have to play with this to make it work perfectly.)
posted by gregr at 2:35 PM on April 23, 2009
I had to update VLC and enable a plugin, but it works great. Thanks.
posted by blahtsk at 3:27 PM on April 23, 2009
posted by blahtsk at 3:27 PM on April 23, 2009
This thread is closed to new comments.
Summary: Re-encoding is probably not necessary, there are players for every major platform that can handle this.
posted by silentbicycle at 2:00 PM on April 23, 2009