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How to make seamless audio loops with iOS?
I'm guessing this is likely easy to do, but I'm not sure how exactly.
Lately I've been making seamless video loops. Usually around 1-3mins. I'd like to add abstract soundtracks that are also seamless loops. Not rhythmic beats, but mini-compositions that seamlessly loop.
After you've made a 60sec composition, or chopped 60secs out of a longer composition, what is the simplest way to edit it so that it's a seamless loop using an iOS app?
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Never mind. Googled it. Way easier that I thought. Admin: Feel free to delete this thread.
@skiphunt , Please post links to the resources you found for the benefit of future readers?
Well, I used this method with video loops and it should work with audio too. Using your editor (cubasis/Auria) cut your segment in half - A and B. No need for precision. Then move the first half (A) to a new track, aligning the first half (A) to start slightly before the second half (B) ends. Put fades on the first beginning and second ending. Render your loop.
AAAAAABBBBBB (the cut)
BBBBBB............. (track 1, fade at end)
...........AAAAAA (track 2, fade at start)
The fades make a "dissolve" , and you can play with the cut and fade timing to get it to (hopefully) sound good. Much easier on ambient stuff with no beat.
As an alternative, If you have a percussive sound, silence or if pitch is not important, you might try cutting directly after the sound, then switching A & B, using just one track. You may hear a jump though.
Good luck!
My pleasure
https://frontieraudio.wordpress.com/2013/04/22/how-to-seamlessly-loop-any-ambience-audio-file/
@AlleycatLA Thx! Luckily I have Auria Pro that does crossfades easy-peasy
Soundforge on the PC, for years, had a handy feature, "crossfade loop". You needed a little extra audio either before, or after the section you want to loop, but it automates the process of a medium or slow crossfade at the seam in the loop, that otherwise you would need to copy a snippet from the beginning, mark the end of the snippet, then move it to the end, crossfade it, starting the crossfade at the end of the loop. Then move the loop point in the beginning to the marker at the end of the snippet, and at the end, to the end of the crossfade (also the end of snippet). It's complicated, but makes loops that would otherwise click or have a noticeably jarring seam, seamless and smooth.
The good loopers in ios (and hardware) do this for a very short, few milliseconds amount of time, to get rid of clicks, but I don't know of any that you can adjust the crossfade time for slow, imperceptable fades in ambient material.
Is that what Auria does?
The best way imo is to find some kind of rhythmic pattern you can loop like any musical piece, then zooming in on the wave, finding the begining of transients and looping on zero-crossings.
If that isn't possible, then you should find similar sections of the sample, in the begining and ending, and use crossfade to mask the transition. If the end of the section is very different from the begining, you may have trouble making a crossfade that sounds seamless. But hey, you can always fade in on the begining, and out on the ending.
I bought twistedwave to be able to do sample acurate looping on ios. But now that auria has elastic timestretch I rather use that, since I can fix small timing issues that the loop might have.
It's not exactly the same problem you have, but I struggled to find a way to record short (2-4 bars) seamless loops when playing live from other apps, especially with reverb tails added on top. So far, it seems that only Loopy is capable of doing that with its overdub mode, but I'd love to hear some other suggestions.
I frequently cut loops from longer tracks in AudioShare via autozoom, it's pretty accurate without crossfades. ('natural' boundaries are more pleasing in my ears)
I'd prefer the reverb part in the final arrangement and mix, but if you want a reverbed loop:
set record in AudioShare to it's own output and insert your reverb app
record 2 or 3 passes and cut out whatever pleases you as in step one
(with some routine it's a quick process, though not as fast as you can do on some PCs)
Audioshare auto-names intermediate results, which makes it easy to repeat a step (or add sone extra processing).
If I'm happy with a result I rename it to something useful and trash intermediates that won't be used anymore.
what are you using for seamless video loops?
Do you mean what app(s) or what audio?
If both, I'll stop now, sorry for butting in.
I'm creating my own from footage I shot, then created cinemagraphs of. I'm also using some slit-scan filter fx to turn organic video footage into abstract geometric motion and then using Cinemagraph Pro and Final Cut Pro to layer stuff with blend effects.
I don't really need audio for these because they're motion art pieces for display on large 4K motion art displays.
The audio is because some motion art that's sold and traded on seditionart.com use looping audio as well with their looping motion art. I thought I might try a few myself using some of the little soundtrack chunks that I sometimes get lucky with acceptable results. I'd just need them to loop as the motion pieces do.
When I get one that I like and care to share, I'll post one here to illustrate.
@skiphunt If I may say so, I think your creation could benefit a lot from foley-type audio, representative movement sound fx, it can give abstract shapes and motion a lot of immediacy & intimacy, if you want those things.
I know you're the pro so I'm sure your final result will be amazing regardless. Just offering a suggestion. I'd really like to see the finished work, or a clip of it if possible?
@skiphunt Wow, I just learnt what a cinemagraph is.
My suggestion still applies equally well, just wanted to thank you for introducing me to a whole new arena of fun.
My pleasure.
Yeah, they're fun to experiment with. And yes, I should get out and get more field recording sources like I'd originally intended. I've got pretty much all the tools I need now. Got a bit distracted with synthesis and fx lately. So, it's good to be reminded. Thx 
In that case you may in fact use good stretching algorithms as mentioned before with Auria or Anytune. The latter has a nice marker management that may be handy if you cut from longer recordings.
Stretching always comes with some loss in quality (the main reason I don't like Ableton link), but in your application such things hardly matter.
With rhythmic material you need to keep the crossfade fairly short, as the rhythmic components will overlap and may or may not align. That being said I've had good results making long soft crossfades by recording audio files into the Ostinator app. It gives you an adjustable crossfade length on the recording and displays Audiobus controls so you can record live from another app such as Audioshare or whatever.
thanks for the info, I was hoping you'd found an video looper app, something that creates seamless loops in the same way that we create seamless audio loops.
No, not seamless... but the Cinemagraph Pro desktop app I'm using does a decent job of hiding the loop point. I'm also using it with no masking for the cinemagraph part, and just using the app for near seamless loops. You only get 10sec loop windows though.
Kind of depends on the source footage how noticeable it is. Likely the same for audio.
I just did a quick test for the audio part. Unfortunately, it doesn't look like YouTube lets you set the playback to loop... but here's a quick test I did. The video part loops back on itself about 4 times I think, but the audio loop is for the full minute:
cool clip, well looks like you've sussed out a unique need in the realm of video apps.... I think a video sampler that had a seamless video loop feature would get a big draw, I'd buy it immediately.
Thanks. I'd be surprised if that didn't exist already. This just came as an extension from the original cinemagraphs I was doing of recently captured Fall leaves while I was motorcycle touring through Arkansas, Kansas, Texas, etc. a couple weeks ago or so.
Here's another one compositing some of the cinemagraphs into a dawn river scene with mist. Haven't added audio yet since I just figured out how to do the loops last night.
And this one shows the cinemagraph better... I wanted it to look almost natural, but just a little off. If you look closely you'll see that some leaves are still with no motion, still freezed, and there's motion blended in for other parts.
Very nice! You just stirred the old VJ in me - back in the day.
good thread