Re: [Libquicktime-devel] libquicktime created files have 0 frame count

[Steven S. <sch...@gm...>]

Hi --

On Fri, Oct 24, 2014 at 10:58 AM, Burkhard Plaum <
pl...@ig...> wrote:

> Hi,
>
> Am 23.10.2014 um 17:57 schrieb Steven Schultz:
>
> > I am still puzzled why the Native color model still shows as Undefined.
> > My memory (possibly faulty) is that it used to say something like "YUV
> > 4:2:2 planar"
>
> Right. The decoding colormodel is now determined just when it's actually
> used,
> because it can involve decoding a first image (not in your case of
> uncompressed
> video of course)
>

Ah, ok.  So my memory of a different behavior was correct.


> Of course qtinfo should not show "Undefined".
>

That is just the symptom of the problem.   Programs that called lqt_get_cmodel
followed by lqt_colormodel_is_yuv immediately after quicktime_open failed
because the color model hadn't been updated.

A possible solution would be to modify quicktime_print_info() such that it
> calls
> lqt_ensure_stream_cmodel_decode() for each video track first. Any
> volunteers?
>

The problem was that let_ensure_stream_cmodel_decode  exits/returns early
if !file->vtracks[track].codec->decode_video and all the
uncompressed codecs still returned 0 if called with row_pointers of 0.

My solution was to modify the videocodec/ uncompressed codecs to return
1 instead of 0 when called with rows_pointers of 0.

Seems to be working OK so far.

Steven