[Ffmpeg-devel] Re: [RFC] mpeg2 422 encoding.

Baptiste COUDURIER baptiste.coudurier
Fri Mar 31 15:02:48 CEST 2006

Ivan Kalvachev wrote:
> 2006/3/30, Baptiste COUDURIER <baptiste.coudurier at smartjog.com>:
>> Hi
>> Im trying to mod the mpeg2 encoder to use 4:2:2 profile.
>> Here is a preliminary work, and results are correct for intra only
>> streams. I will work on Long GOP encoding after.
>> I would like your comments, especially from someone who really know
>> mpeg2 specs, and knowing if Im really out or if im going into the right
>> direction.
>> Weighting is not yet taken into account (422 and 444 requires different
>> coeffs).
>> Next step for me would be to enable intra_vlc_format encoding. I just
>> digged into the code and found that some support was envisaged (code is
>> disabled in mpeg1_encode_block, but is here).
>> Any hints to achieve that ?
>> And finally supporting non linear q_scale_type.
>> All this work is to support D10 encoding, widely used in editing systems:
>> http://www.smpte.org/smpte_store/standards/pdf/s356m.pdf
>> Thanks a lot.
> Why are you adding only YUV422 support, the efforts needed to add
> YUV444 are similar.

Indeed. Dont worry, implementation will be complete and 444 will be
supported as well.

Baptiste COUDURIER                              GnuPG Key Id: 0x5C1ABAAA
SMARTJOG S.A.                                    http://www.smartjog.com
Key fingerprint                 8D77134D20CC9220201FC5DB0AC9325C5C1ABAAA
Phone: +33 1 49966312

More information about the ffmpeg-devel mailing list