[Ffmpeg-devel] Re: [PATCH] DVCPRO50 support

Michael Niedermayer michaelni
Fri Mar 3 17:28:05 CET 2006


On Fri, Mar 03, 2006 at 01:37:44PM -0000, M?ns Rullg?rd wrote:
> To facilitate automatic selection of conversions to apply before encoding,
> I vote for inventing those new tables.  I'll do a survey of restrictions
> is various codecs and see if I can think of a sensible solution.

let me help a little, heres what i remember about various restrictions

pix_fmts (often just one, sometimes several)

framerate (precission of num/den might be restricted, depends upon strictness
for mpeg for example there are a few invented rates and for mpeg in mov or avi
there could be a restrictionless case)

resolution (sometimes arbitary sometimes a few fixed like h.261,sometimes
might need to be a multiple of a small integer IIRC h.263 needs *4)

samplerate (sometimes aritrary some times a few fixed with arbitrary only
if strict<xyz)

in some cases like dv res-pix_fmt-framerate depend on each other


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