[FFmpeg-devel] improved DV probe score patch BROKES detecting 1-frame DV

Benjamin Larsson banan
Fri Sep 25 16:53:28 CEST 2009

Reimar D?ffinger wrote:
> On Fri, Sep 25, 2009 at 11:48:55AM +0300, Maksym Veremeyenko wrote:
>> I always thought that format detection for ffmpeg is prioritized in way:
>> 1. "-f <format>" input format redefinition
>> 2. input file extension
>> 3. stream probe
>> Why does it perform stream probe if input file extension is defined?
> No, no idea where you got that from.
> Extension does not matter for formats that have a probe function (which
> may be a bad idea), and for formats that do not have a probe function it
> sets the score to 50 (which seems a bit high to me).

The file extension should just add to the score. Maybe not by 50 but at 
least something.

> Anyway, once more the MPEG detection strikes (if someone can find the
> motivation, extending probetest to check that no two probe functions
> return the same value even if <= 25 might be a good idea).
> Of course the DV probe function probably could be improved to reliably
> return a higher score for single-frame DVs, but that is a bit more
> effort :-).
> E.g. this change makes it work:

Benjamin Larsson

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