Re: [Libquicktime-devel] mdhd-atom, version 1

[Burkhard P. <bur...@ig...>]

Hi,

Am 25.09.2017 um 11:09 schrieb Phil Barrett via Libquicktime-devel:
> On Sun, 24 Sep 2017 14:46:04 +0100, Erik Johansson <eri...@gm...> wrote:
> 
>> I have no further info on this other than sample files, but seeing how
>> the mac timestamps are nearing the end of the 32-bit range, it seems
>> plausible they've expanded them to 64-bits.
> 
> See https://www.adobe.com/content/dam/Adobe/en/devnet/flv/pdfs/video_file_format_spec_v10.pdf for some documentation that agrees with you.

On pages 24 and 25 it says for version == 1, creationtime, modification time and duration become 64 bits
in the mdhd "box". This makes it 12 bytes larger (44 instead of 32). ffmpeg also has code to handle these
(libavformat/mov.c, mov_read_mdhd()). I guess that's enough "documentation" :)

Any volunteer wants to make a patch?

Burkhard