[FFmpeg-trac] #9598(ffprobe:new): Wrong Chroma Location (Type 2, top left) for XDCAM Files (Type 0, left) in FFProbe

FFmpeg trac at avcodec.org
Mon Jan 17 19:23:11 EET 2022


#9598: Wrong Chroma Location (Type 2, top left) for XDCAM Files (Type 0, left) in
FFProbe
-------------------------------------+-------------------------------------
             Reporter:  FranceBB     |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  ffprobe
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
  ChromaLocation                     |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Comment (by Hendrik):

 If the chroma plane is both vertically and horizontally aligned with the
 Luma plane, which MPEG-2 4:2:2 is, then "topleft" actually seems like the
 correct value - because it indicates the position of the first chroma
 sample, as per the ffmpeg documentation of AVChromaLocation.

 You could even argue that for 4:2:2 both "left" and "topleft" are supposed
 to be handled identically, due to the absence of vertical subsampling, so
 in practice it would make no difference. The only reason h264 would result
 in a different value is that h264 actually conveys that information, while
 mpeg2 does not.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9598#comment:6>
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