Am 16.03.20 um 01:43 schrieb Ulf Zibis:

I now inserted the following:
1. "CEAP" to ftyp (0x18 instead 0x14 bytes)
2. moov atom with qt-fast
3. udta atom from original at the start of moov atom (increases it from 0x1340E 
to 0x1344A)
Result:
Instead of a big "?" I now see a the preview picture on the camera. Unfortunately I still 
can't play the video because of "Not identified Picture".
So we are a little step closer to the solution.
I now realise the problem, as I see, that the so "patched" file is also not 
playing anymore with ffplay.

The insertion of the additional bytes moved back the video data, so I guess, 
this makes the index data in the moov atom invalid. Is ffmpeg somehow able to 
insert additional data with correcting the moov index data in parallel?

I also will try to replace the udta atom in the running original file with 
free, to see, if it still works.

-Ulf

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