[FFmpeg-user] ProRes (LT) Quicktimes: Good for Windows. Not so good for Mac.

[Andreas Gumm]

Interesting! Your sounds really conclusive.

Andreas

Am 20.03.2012 22:46, schrieb Thomas Worth:
> On Tue, Mar 20, 2012 at 2:22 PM, Andreas Gumm<andreas.gumm at gmx.de>  wrote:
>> Yes, this is a known issue! Your files has been correct encoded! FCP just
>> complains sometimes about external encoded ProRes footage!
>> It seem to be that some missing header informations or other stupid missing
>> informations let FCP think the file looks not compatible!
> About this, I think the Final Cut media warning may be related to the
> A/V interleaving, i.e. the way the chunk offset tables are written. I
> don't think it has as much to do with information in the QuickTime
> header. Files written without audio don't show the warning. Baptiste
> Coudurier might comment on this. If anyone knows why this is
> happening, is would be him.
>
> Also it should be noted that the media performance warning does not
> occur when QuickTime files are written with a co64 atom. So, Final Cut
> apparently likes FFmpeg MOV files written with 64 bit offsets. This is
> just more evidence to support the theory that offset tables for both
> video and audio that don't play well with each other may be
> responsible for triggering the media warning. This should be fixed
> because if the A/V offsets aren't occurring in contiguous order and/or
> aligned, it is potentially hindering disk performance. Again, this is
> only speculation but I am pretty sure this is where to look for the
> problem.
>
> Someone might take a gander at movenc.c and see if interleaving is
> done differently with 64 bit MOV offsets vs. 32 bit ones.
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