Speed up Video without changing Pitch

Hi I'd like to be able to play a Video in my app without changing the Pitch. is there anyway of doing this?

is there any software that can do this?
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eNarcAsked:
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tbsgadiCommented:
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eNarcAuthor Commented:
Hi, I've been there before and yea luck is needed :) is there anything else? that could be the answer?
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MerijnBSr. Software EngineerCommented:
The idea is simple, rip audio out, speed up video with video app, speed up audio with audio app, merge the two again, basically what is described above except that you can change the apps with different ones if you like.
Speeding up of especially audio is tricky, so the quality may very per app.
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fredshovelCommented:
The pitch of what? Most video that is sped up or slowed down (slowmo) is usually accompanied by a seperate audio track of music. But if you mean that you need to speed up speech and keep it in sync with a faster video then you export the audio into something like Cool Edit Pro (Now called Audition) of a similar advanced audio editor. They have stretch and shrink for the audio without changing the pitch (or changing it if you like). However you still have to line it back up with your video. If it doesn't line up you can simply move the audio time line, thus inserting a gap or even cutting out gaps whilst a speaker is pausing inbetween speech until you line it up perfectly. All adds on TV are done in this way -- with seperate audio and video tracks recorded mostly at seperate times.
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eNarcAuthor Commented:
any apps that keep the pitch as normal with it being 2 to 3+ times its normal pace?

that can be done to videos and audio
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fredshovelCommented:
You need to furnish more information. As asked before, what type of video are you talking about. If you're talking about speech,  how could you keep it in sync if the, say, mouth of the person was moving at 2 to 3 times the normal speed?
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eNarcAuthor Commented:
well to be honest most video speeders really can't take anything above 2x in live from what I've tested without coming of sync, though it syncs fine in chimpmunk up to about 4x though can't understand any of it...

mostly kmplayer works great at 2x though anything above 2x it falls out of sync,

reclock, is chipmunk, though it allows playing it within windows media player... cos windows media player doesn't allow videos to be on speed..

the speed of audio from windows media player seems the be the best of every one I've tried..


fred, there isn't really much I can explain about it, without going into lameum terms. so here it is.


I'm looking for a program that can speed up video and audio while still keeping the pitch and tempo of the persons voice as if nothing has changed...

the chimpmunk sound is just a lazy way of speeding things up, because even if you speed it up just can't hear it...

now I've watched a video that was speeded up 4x it was a seminar, I don't know what program that did this though a 1hr video was completed in 15mins and I understood every word...

so what I'm saying is needing an app that can keep the video real at the same time speeding it up 4+x while keeping the tone in tune..

I've also listened to a paul scheele audio and that was speeded up like a 30min audio to 10mins and the pitch and sound was absulutly perfect, I could hear every sound the person was making at the same time it was speeded up 3x and it was amazing quality..

now I just need that happening.

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eNarcAuthor Commented:
like with speed reading a person if practiced each day can read well over 10,000 words a minute, could complete a book in a very short period of time.

just like videos and audios, if you listen to some they talk so slowly and its like omg.... I got a life here... I need to listen to these at warp speed!##

like at the moment I'm listening to audio and videos at 2x and I'm now at a point I just need it faster, its too slow!!! I've gotten used to it being at 2x and when I drop it to 1x its like I'm able to think faster than the persons talking and its like wow........ so I put it back on 2x.... even though at 1time its like yea, feels as though your on a beech and just so relaxing u know when someones talking slow though really they aint lol well they are in perspective though u know what I mean :)

though I really need it faster, I'm craving for it to go faster. people talk so slow its like wow!
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fredshovelCommented:
Without knowing any software that can do both at the same time. I would come back to my original suggestion to "split" the audio and video.  "Stretch" the audio first ot a tolerable extent (you choose "stretch" in Time/Pitch Effects but you actually then choose speed up and regulate the amount with athe given fader) -- I use Cool Edit Pro -- no pitch shift. Then replace the new audio with the old audio. Of course it's out of sync -- so then you start speeding up the video in your video editor until you get it in sync.
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eNarcAuthor Commented:
cool edit pro is adobe audition? I had cool edit pro will have to see if i still have it :)
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JosephGloszCommented:
Since you want to speed up the video, then you have to use a decent video editor anyway. Like Premiere, Vegas, Media Studio Pro, Avid, etc.

The ones I use all allow you to speed up the video and sound by any factor. Most if not all, also have  built it (as well as third party) video and sound 'transformations'.  Meaning, you can apply a transformation to make a clip black and white, for example.

Or you can change various aspects of the sound. Such as echo, pitch, loudness, reverb, and a dozen other things.

So for starters, get one of these programs, speed up the clip by 2X and then apply a pitch change to fix the "chipmunk" effect.  I have done this specific thing and it works reasonably well.

However, I think you want even more than that. You want to keep the same 'tempo' too. For this, I think you need much smarter algorithms that will do things like remove silence from clips.

Actually, most sound editor programs have that as well.  So I'd try this:

Load the vid clip into a decent video editor. If the video editor can't already 'remove silence' then export just the sound track to a WAV file or such and import it into a sound editor that can remove silence. At which point the sound clip will be shorter by 10% - 20%. Then speed it up by a factor of 2X, and apply a pitch transformation at the same time. Export back to a wav, replace the sound track of your existing video clip with this one.

Then speed up the video to exactly match the length the sound clip. It'll probably be around 2.2x.

Then render that into a video (AVI, MOV, whatever) and you have your speeded up clip.

However, all this really IS a lot of manual work.









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eNarcAuthor Commented:
wow, I never knew that setting was in, I'm absolutely gob smacked, it actually deleted all the pauses in the speech, its now 1 continuous speech, I'm truly gob spacked, for realz when I was listening to it, I had my mouth open, this is totally like how paul scheele does his endings, he has it playing normal and then at the end its speeded up 3x and no gaps the whole thing so its a quick refreshment, I find that I learn faster doing it that way :) I'm truly wow right now :D its totally shortened the total time by 9 minutes on a 1hr audio without speeding it up :D
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eNarcAuthor Commented:
yea your right about the manual work, would be great if could use batch like audicity :) to work with audition :)
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eNarcAuthor Commented:
now this is perfect, I can feel my mind having a workout :) I got so used to the sound being at 2x with the gaps etc, and I have to say I really have to admit that it sounds sooooooooooooooooooooo much better with the delete silence added.

it sounds so natural at 2x :) from 1.04hr audio its now at 28mins so now in 1hr I can listen to it 2x instead of once increasing learning by double :) cos we always hear something new on our second time we listen to it :) instead of listening for 2hrs I can now listen for 1hr and then spend 1 more hour jotting down notes and, yea I really like this :)
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JosephGloszCommented:
Ha! See, just as I predicted: a compression factor of 2.25x!

And the trick is to remove the silence first, then speed it up, instead of the other way around.

Even though it's a manual process, I'll bet that once you've done it a couple of times, it will become a very quick workflow...
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