<p>We have been asked by a client to create a ProRes QT file (.mov) but specifically asked to "<strong><em>The moov atom (movie index file) should be placed at the beginning of the file.</em></strong>" I have been reading around but could not find a solution for .mov files. Everybody is talking for .mp4.
The line I came with is:</p>

<pre><code>ffmpeg.exe -i input.mov -c copy -map 0:v:0 -map 0:a:6 -map 0:a:7 -movflags faststart output_ATOM.mov
</code></pre>

<p>The audio mapping and the video copying is working fine. I need to know if the <strong><em>-movflags faststart</em></strong> is actually going to do the job? I can't find a way to check the result if it actually moved the Atom.</p>

<p>Thanks!</p>

CC BY-SA 4.0
2020-04-16T06:15:33.453Z
.mp4 and .mov are pretty much synonymous. Moving the moov atom to the start fo the file is what faststart does, so it whould work. I don't exactly know how you'd check it, other than trying to play the movie over a slow internet connection.
stib
CC BY-SA 4.0
2020-04-16T08:11:53.813Z
Thanks for confirming stib! I actually found a way. open the file with a HEX editor and if it's correct, the moov should be at the start. Thanks!
Yannis
<video><ffmpeg>
ffmpeg MOOV Atom on a ProRes file?
Yannis
# ffmpeg MOOV Atom on a ProRes file?

(Asked by: username_0 on 2020-04-15)

We have been asked by a client to create a ProRes QT file (.mov) but specifically asked to "The moov atom (movie index file) should be placed at the beginning of the file." I have been reading around but could not find a solution for .mov files. Everybody is talking for .mp4.
The line I came with is:
ffmpeg.exe -i input.mov -c copy -map 0:v:0 -map 0:a:6 -map 0:a:7 -movflags faststart output_ATOM.mov

The audio mapping and the video copying is working fine. I need to know if the -movflags faststart is actually going to do the job? I can't find a way to check the result if it actually moved the Atom.
Thanks!

**Tags:** video, ffmpeg

> **Comments:**
> **username_1**: .mp4 and .mov are pretty much synonymous. Moving the moov atom to the start fo the file is what faststart does, so it whould work. I don't exactly know how you'd check it, other than trying to play the movie over a slow internet connection.  
> **username_0**: Thanks for confirming username_1! I actually found a way. open the file with a HEX editor and if it's correct, the moov should be at the start. Thanks!  

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## 0 answers

