I've edited an MP4 movie file in Quicktime Player Version 10.5.
When I try to save the edited file, I get: The operation could not be completed.
Does anyone know what causes this and/or how it can be solved?
macOS Mojave 10.14.2 / Quicktime Player 10.5 / MacBook Pro (Retina, 13-inch, Early 2015)
For me, the error came as I was editing in Quick-Time by right-clicking on the imported video in the Photos app.
Once I dragged the video (export) to a directory, and then edited the .mp4 file, all was fine. No errors when Trimming and Saving.
I had a similar problem when I downloaded a youtube video, opened in Quicktime to "trim" the video and quick time would not complete the operation. I ran the youtube video through Vlc Crunch (free video converter)as mp4 again and then Quicktime worked fine.
I found a workaround. It seems that QuickTime is able to handle the file via the Share feature but not the Export.
You can choose to share to Messages and then save the file from there, or use Shareful, a small free app that lets you enable a "Save as" option in the Share menu.
Guyz hello, i'm on High Sierra, i have that error "The operation could not be completed / Impossibile completare l'operazione", it happens often when i trim / cut a downloaded .mp4 video(same happened on el capitan), i think it cause there are small problems/errors after the download of a video, also if video is well played by Quick Time / VLC. So i simply copy the downloaded video and paste it in another location, example - copy from download folder and paste to desktop. Then i can save the trimmed / cutted video. I think after copy in some magic way OSX corrects those small errors. Hope it will work for you also! Have a nice day!^^
Not an actual answer. But inform some important piece of information.
I encounter the same problem. The error code is "-12769"
Found out that there are some input videos which worked.
And when I compare both info of videos.
A video that's work :
A video that's doesn't :
The only difference is encoding software between Lavf57.19.100 vs Lavf58.12.100
I get this error all the time as well (usually with error code -12780). I have a feeling it is related to files that have small errors (like missing keyframes, or a videotrack that is out of sync with the audiotrack).
Unfortunately the only solution i have found thus far is re-encoding the video and trying again (using a tool like ffmpeg or Handbrake) or using editing software like Premiere Pro / iMovie / Final Cut. In both cases, you need to re-encode the video and it will take some time.
This is an old question but I will answer it for others having the same issue. (Added note: I just realized my error is slightly different - it won't save because I don't have permission).
I just solved it by changing the folder it's saved to. It was defaulting to my Mac hard drive and for some reason would not save there. I changed it to another folder and it saved just fine. Hope this helps someone.
