[FFmpeg-user] Help pix_fmt yuv422 doesnt work

[Reto Kromer]

Kieran O Leary wrote:

>On Tue, Nov 3, 2015 at 5:28 PM, Rio Kierkels <riokierkels at gmail.com> wrote:
>> You can't, DPX is not a YCbCr style format. It will always set it to some
>> form of 444 RGB/BGR format.
>> Why would you need a 422 DPX format?
>>
>
>I've only ever worked with RGB DPX files in ffmpeg, but it's
>interesting that the Library of Congress lists YCbCr as one of the
>potential components.
>http://www.digitalpreservation.gov/formats/fdd/fdd000178.shtml#identification
>"Each DPX file represents a single image with a single component,
>e.g., luma, or multiple components, e.g., red, green, blue; or Cb, Y,
>Cr (chrominance-luminance data)."
>
>Imagemagick also appears to support YCbCr in DPX?
>http://www.imagemagick.org/script/motion-picture.php
>
>There is a list of YCbCr formats listed in the header info, but this
>could just be provenance info rather than actual information about the
>file?
>http://www.fileformat.info/format/dpx/egff.htm#DPX-DMYID.3

This may also be of interest:

"SMPTE 268M-2003 Specification Inadequacies" by Bob Friesenhahn (2005)
http://www.simplesystems.org/users/bfriesen/dpx/dpx-issues.pdf

Best regards from Reto