[FFmpeg-soc] access to input file metadata from within avfilter?

[Víctor Paesa]

Hi,

On Thu, Sep 10, 2009 at 9:42 PM, Norbert Burger
<norbert.burger at gmail.com> wrote:
> Vitor -- thanks very much for the clarification.
>
> On Thu, Sep 10, 2009 at 3:33 PM, Vitor Sessak <vitor1001 at gmail.com> wrote:
>> Norbert Burger wrote:
>>>
>>> Hi folks,
>>
>> Hi
>>
>>> Is there a recommended way to inspect AVStream metadata for my input
>>> file from within filter code?
>>
>> Sorry but no. Libavfilter was projected to be completely independent of the
>> other lav* libraries, so there is no API for that (and I cannot see a clean
>> way of doing it).

Not necessarily clean, but be aware that avfilter_init_filter() admits an opaque
parameter.

You could patch a bit ffmpeg.c (actually 02_ffmpeg_filters.diff) to
pass on ist->st
to avfilter_init_filter() instead of the NULL it currently receives.

Read this thread too:
http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/87624

Regards,
Víctor