[FFmpeg-user] Problem with DAR and SAR readout from AVCI-50 and DNxHD MXFs

[Christoph Gerstbauer]

Hello,

I am testing many MXFs (Op1a) with AVC-Intra and DNxHD from different 
encoder programs or plugins.
With 4 files (2 anamorphotic AVCI and 2 FULL HD DNxHD) I have problems 
to get the right DAR and SAR.

All files are 16:9:
DNxHD files are 1920x1080 FULL HD
AVCIntra files are anamorphic (AVCIntra Class50 1440x1080), no problem 
with FULL HD AVC-Intra files

the 4 testfiles (2 packed in 1 zip) can be downloaded here (one is very 
big, 1GB, sorry but I want to keep the original):
https://dl.dropboxusercontent.com/u/26129407/ffmpeg_user_mailing_sample_MXF_AVCI_fieldorder_and_SAR_PAR_problem_FILE1.zip
https://dl.dropboxusercontent.com/u/26129407/ffmpeg_user_mailing_sample_MXF_AVCI_fieldorder_and_SAR_PAR_problem_FILE2.zip
https://dl.dropboxusercontent.com/u/26129407/ffmpeg_user_mailing_sample_MXF_DNxHD_SAR_PAR_problem.zip


The Problem is that ffmpeg reads out following:
1.) AVCI files - DAR = 1:1 / SAR = 3:4.
2.) DNxHD files - DAR 0:1 = / SAR = 0:1

By using ffprobe -show_frames, and checking the video frames following 
comes out (see xml files in the ZIP files):
AVC_Intra Files: sample_aspect_ratio = 3:4
DNxHD Files: no information

I checked the files with Mediainfo and Mediainfo show the correct aspect 
ratio 16:9.
Using MXF BMX and checked the "Aspect Ratio" information:
3 files have 16/9,
1 AVCIntra file has 5760/3240 (= 16/9)

mxf2raw output:
   MXF version                : 1.2
   OP label                   : OP-1A (internal essence, stream file, 
multi-track)
   Wrapping type              : Frame
   Material package name      :
   Material start timecode    : 00:00:00:00 (@ 25fps)
   File src start timecode    : 00:00:00:00 (@ 25fps)
   Edit rate                  : 25/1
   Precharge                  : 0
   Duration                   : 251
   Rollout                    : 0
   Identifications            :
     Identification 0:
       Generation UID    : b466f1a7.46d111e3.89e628cf.e91730a1
       Company name      : Adobe Systems Incorporated
       Product name      : Premiere Pro
       Product version   : 7.0.0.0.1 (released version)
       Version string    : 7.1.0
       Product UID       : 10ab07a9.e89e7510.a923ea92.20524153
       Modification date : 2013-11-06 10:53:44.000
       Toolkit version   : 4.4.24.0.3 (released with patches version)
       Platform          : Mac OS X
Track 0:
   Essence kind         : Picture
   Essence type         : AVCI 50Mbps 1080i
   Essence label        : 060e2b34.0401010a.0d010301.02106001
   Material package uid : 
060a2b34.01010105.01010d11.13000000.c0825602.026605a5.f68828cf.e91730a1
   Material track id    : 1
   Material track number: 0
   File package uid     : 
060a2b34.01010105.01010d12.139a5962.c0825602.026605a5.458c28cf.e91730a1
   File track id        : 512
   File track number    : 0x15010500
   Edit rate            : 25/1
   Duration             : 251
   Lead filler offset   : 0
   Picture coding label : 060e2b34.0401010a.04010202.01322102
   Signal standard      : 0 (None)
   Frame layout         : 1 (Separate Fields)
   Stored dimensions    : 1440x1088
   Display dimensions   : 1440x1080
   Display x offset     : 0
   Display y offset     : 0
   Aspect ratio         : 5760/3240
   AFD                  : (not set)
   Component depth      : 10
   Horiz subsampling    : 2
   Vert subsampling     : 2
   Color siting         : 255 (Unknown)
   AVCI header          : true

Best Regards
Christoph