user18905: I'm a new iOS user, and previously on my Android device, from time to time I needed to change the aspect ratio of a video to 1:1 (to fit with Instagram).
So at that time, I was using this app that let's you directly type ffmpeg commands as if you were using a computer, so I it was simple to do it by using :
-vf "scale=720:720,setsar=1:1"

But unfortunately I didn't find any alternative on iOS.
So, does anyone know an app that will let me change the aspect ratio of a video?

user14504: Videon
It's a great app for the iPhone. 
Not only does it have some great camera features; like stabilization, and manual exposure/WB, but you can also use it's post feature on any clip in your Photos folder. 
You can crop, change aspect ratio, framerate, adjust rotation, pretty much anything... along with a ton of filters; color correcting tools and so on. 
Very easy to use. And real time playback of your file as you correct it. 
When finished, you can output your file by exporting it to a variety of bitrates and sizes. 
A must have!

18905: <p>I'm a new iOS user, and previously on my Android device, from time to time I needed to change the aspect ratio of a video to 1:1 (to fit with Instagram).</p>

<p>So at that time, I was using this <a href="https://play.google.com/store/apps/details?id=com.silentlexx.ffmpeggui&amp;hl=fr" rel="nofollow noreferrer">app</a> that let's you directly type ffmpeg commands as if you were using a computer, so I it was simple to do it by using :</p>

<pre><code>-vf "scale=720:720,setsar=1:1"
</code></pre>

<p>But unfortunately I didn't find any alternative on iOS.</p>

<p>So, does anyone know an app that will let me change the aspect ratio of a video?</p>
 14504: <p><strong>Videon</strong></p>

<p>It's a great app for the iPhone. </p>

<p>Not only does it have some great camera features; like stabilization, and manual exposure/WB, but you can also use it's post feature on any clip in your Photos folder. </p>

<p>You can crop, change aspect ratio, framerate, adjust rotation, pretty much anything... along with a ton of filters; color correcting tools and so on. </p>

<p>Very easy to use. And real time playback of your file as you correct it. </p>

<p>When finished, you can output your file by exporting it to a variety of bitrates and sizes. </p>

<p>A must have!</p>
