[FFmpeg-user] How to compress .MOV file compatible to Canon camera

[Ulf Zibis]

Am 12.03.20 um 00:07 schrieb Carl Eugen Hoyos:
> Am Mi., 11. März 2020 um 23:56 Uhr schrieb Ulf Zibis <Ulf.Zibis at gmx.de>:
>
>>      compatible_brands: qt  CAEP
> What happens if you remove CAEP with a binary editor?

When I replace CAEP in the original video with 4 0x00 it is still playable.

Here are the first 32 bytes of the original:
00 00 00 18 66 74 79 70 71 74 20 20 20 07 09 00 71 74 20 20 43 41 45 50
00 01 7F E8 6D 6F 6F 76   ....ftypqt   ...qt  CAEP...èmoov

Here replaced with 4 0x00:
00 00 00 18 66 74 79 70 71 74 20 20 20 07 09 00 71 74 20 20 00 00 00 00
00 01 7F E8 6D 6F 6F 76   ....ftypqt   ...qt  .......èmoov

Here are the first 32 bytes from ffmpeg:
00 00 00 14 66 74 79 70 71 74 20 20 00 00 02 00 71 74 20 20 00 00 00 08
77 69 64 65 01 67 16 A6   ....ftypqt  ....qt  ....wide.g.¦

As you can see:
- the magic number (the first 4 bytes) is different, why?
- there is a different number of 0x00 bytes after the brands string,
don't know if that matters.
- from byte 12 to 15 there is the different minor version number.

> You can also try -video_track_timescale, this often was the
> reason for incompatibilities.

I'll try that too.

-Ulf