[Ffmpeg-devel] Re: [PATCH] dv pixel format encoding fix

Baptiste COUDURIER baptiste.coudurier
Fri Mar 10 10:14:43 CET 2006


Roman Shaposhnick wrote:
> On Thu, Mar 09, 2006 at 05:13:11PM +0100, Baptiste COUDURIER wrote:
>>Here is a patch to fix pixel format while encoding in dv.
>>SMPTE 314M defines 411P and 422P, and specifies atp as 1. Appendix A
>>shows that IEC 61834 used 0 as atp. SMPTE 314 specifies STYPE to be 1
>>for 422P and 0 for 411P, I assume 420 is 0.
>   All this is fine, but I thinks this is really getting to a point where
>   this has to be per profile. For example, your patch doesn't take into
>   account the fact that encoding 411P for NTSC could mean either IEC 61834
>   or SMPTE 314. The VAUX STYPE is also not quite clear for IEC 61834.
>   I'll have to either try digging up something resembling an IEC spec
>   or look at the IEC 61834 raw output. Stay tuned ;-) 

I assume that 411P is SMPTE 314M, revision is from 2005. Let's forget
about IEC 61834 for 411P. The only case where VAUX STYPE is set is for
422P and that is obviously SMPTE 314M.

Thanks Roman.

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