[Ffmpeg-devel] Field encoding

[Rich Felker]

On Thu, Aug 25, 2005 at 08:06:34PM +0100, M?ns Rullg?rd wrote:
> Ian Gowen <ian.gowen at gmail.com> writes:
> 
> > Does libavcodec support encoding fields, e.g. MPEG-2 for DVD? If so, what 
> > fields(heh) do I set to make it aware that the input I'm giving has fields?
> 
> Libavcodec supports interlaced encoding, but only as frame pictures
> containing both fields.  There is no support for encoding top and
> bottom fields separately as field pictures.  To activate interlaced
> encoding, set CODEC_FLAG_INTERLACED_DCT and CODEC_FLAG_INTERLACED_ME
> in AVCodecContext.flags.  When encoding interlaced material, it is
> important to also set the top_field_first flag properly, or watching
> the result on a TV will give you a headache.

If the source is field pictures, you can just interleave them before
passing them to the encoder, BTW. Then you get to pick the field
dominance.

Rich