[Ffmpeg-devel] [PATCH] AVOption defaults sync

[Panagiotis Issaris]

Hi,

Op donderdag 14 september 2006 15:13, schreef Baptiste Coudurier:
> Panagiotis Issaris wrote:
> > [...]
> > Well, the MPEG-4 codec is used by default, so I would assume it would
> > be most interesting to give it a "good" value for MPEG-4 encoding, and
> > ignore f.e. the DVD specs. If one wants DVD compliance, one will most
> > likely use the -target (pal|ntsc)-dvd anyway. Remains to be seen what
> > a "good" GOP size for MPEG-4 would be... :)
> > 
> > I vaguely recall someone doing tests altering various libavcodec encoding 
> > parameters and comparing the resulting visual quality and/or PSNR. I could
> > search and have a look at that, but I'm not sure if it is still relevant. 
> > I think I saw this webpage some years ago, and FFmpeg's MPEG-4 encoding might 
> > have changed considerably. Would it be a good idea to look at it, or would
> > it not be relevant anymore?
> > 
> 
> I also recall of an idea to have defaults for each codec. That would 
> definitely be a great solution.
:) I think I recall a discussion about having AVOptions per codec. But,
I do not think that thread reached a consensus. It is similar in the
sense that someone made the remark in the previous thread, that someone
would have to keep those structures up to date, and even initially
someone would have to check which options make sense for which codecs.
The same would have to happen for setting such per codec defaults. Not
that I think that it would _not_ be a good idea to have per codec
defaults, as they could be a bit more sane/specific. Although... their
are other (probably more important even) factors which determine what 
settings to choose, such as the intended use (network streaming, DVD
backup, ...). 

With friendly regards,
Takis