Corrupted files with iPhone BM Camera app

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tacchan23

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Corrupted files with iPhone BM Camera app

PostTue Jan 14, 2025 2:35 pm

Hello,
I got a corrupted file when the phone storage runs out while recording.
The camera app had a popup message about not having any more Storage space on the phone and the recording stopped.
The file can playback in DaVinci but there are many corrupted frames plus the Media Offline image pops up randomly (then checking frame by frame there is no frame missing or offline)

I guess there is no way to fix the corrupted frames, but I may be able to at least use some scenes here and there between the corrupted frames if I could at least fix the random Media Offline.
Should I ask in the Resolve forum maybe?

Also, as this has happened 2 times already on 2 different occasions, I think it's a bug of the Camera App?

EDIT: in the Black Magic camera app the file playbacks flawless without any corrupted frame.
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John Paines

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Re: Corrupted files with iPhone BM Camera app

PostTue Jan 14, 2025 7:10 pm

From your account, I'm not convinced there are no dropped frames, but in any event, to salvage what you can, try transcoding the file in a third party application to an intermediate format (like Prores), and see what's playable and/or what can be extracted with an editing application.

The fact the file got corrupted when the recording media ran out is not really a "bug", although one might wish it would shut down in an orderly fashion as the end approached.
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Uli Plank

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Re: Corrupted files with iPhone BM Camera app

PostWed Jan 15, 2025 3:45 am

The internal playback may just hide the dropped frames, while DR is honestly showing them.
If those shots are worth the effort, this method may help (we used it for BRAW):
- Save the audio to a separate file.
- Export the video as an image sequence.
- Sort that folder by size and kill all the very small frames (they are the dropped ones).
- Sort by number again, renumber them sequentially (there are dozens of free tools to renumber).
- Import the result as sequence, it will be shorter, but should have no dropped frames.
- Now use the audio, which has normally the correct length as a guide, and stretch the video to match.
- Use Speed Warp and render it into a high-quality codec.
My disaster protection: export a .drp file to a physically separated storage regularly.
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tacchan23

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Re: Corrupted files with iPhone BM Camera app

PostThu Jan 16, 2025 3:17 pm

I am reporting back my solution in case someone faces the same problem in the future.

- I rendered the corrupted files with Shutter Encoder and the result was perfect, no dropped nor corrupted frames (I also tried using the Media Management in Davinci but the file didn't change)

- the proxy files created by the camera app are not corrupted when the storage runs out, so as a last option I would have used them
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jomag7

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Re: Corrupted files with iPhone BM Camera app

PostFri Jan 17, 2025 2:12 am

If the Blackmagic camera app plays the file without problems, it does seem like a bug with the iPhone app.

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