> Rens Dijkshoorn <rens <at> onlinemedia.nl> writes:
>
> > If you change vtag to use -vtag ai12. Then the file will
> > playback in Quicktime Player 7 but not in Quicktime Player
> > X. Then if you search the resulting movie file for the
> > vtag and hexedit to 'ai12 to aivx' the file will play in
> > both version of Quicktime Player.
>
> Could you test the following inlined patch?
>
> diff --git a/libavformat/movenc.c b/libavformat/movenc.c
> index 6e51424..842b4bf 100644
> --- a/libavformat/movenc.c
> +++ b/libavformat/movenc.c
> @@ -1278,6 +1278,8 @@
> else if (rate == 50) tag = MKTAG('a','i','1','5');
> else if (rate == 60) tag = MKTAG('a','i','1','6');
> }
> + } else if (track->enc->width == 4096 && track->enc->height == 2160) {
> + tag = MKTAG('a','i','v','x');
> }
> }
>
With this patch no matter what you use as -vtag ai12 or no vtag option.
The vtag is always set to aivx (checked with Dumpster). But the resulting
file won't play in any Quicktime Player or FCPX
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