Artifacts showing up on dual_iso with latest mlv_dump

Issue #2616 new
Daniel Fort created an issue

Artifacts are showing up on dual_iso files when processed through mlv_dump right after this pull request was merged: https://bitbucket.org/hudson/magic-lantern/pull-requests/732/5d3-attempt-to-fix-vertical-stripes-so-it/diff

The discussion begins here: http://magiclantern.fm/forum/index.php?topic=7122.msg173266#msg173266

I believe that this only affects shots coming from the 5D3 but haven't done extensive tests to be entirely sure.

Comments (7)

  1. Georg Hofstetter

    can you please provide some file to reproduce the issue? e.g. a MLV with only a few frames

  2. Daniel Fort reporter

    Note on that sample file that the white balance is set to 2550K. That threw me off at first because when I processed it in cr2hdr it doesn't honor that. In fact it looks quite "normal" but opening the file in MLVFS shows the "correct" color.

  3. Georg Hofstetter

    @a1ex can you please look into that?

    this is how it should look: http://www.magiclantern.fm/forum/index.php?action=dlattach;topic=7122.0;attach=953;image

    this is how it looks: https://c4.staticflickr.com/9/8571/30226431131_ddb7c8c361_o.jpg

    reason for that change is ab24965b3f4d45e4cba10214bc0061f36b440730

    i am not aware of how this should cause the weird vertical stripes detection. here two runs of mlv_dump, one before that commit, one after that commit

    ```

     MLV Dumper v1.0
    -----------------
    
    Mode of operation:
       - Input MLV file: 'D:\Users\g3gg0\Downloads\corrupt.mlv'
       - Convert to DNG frames
       - Output into 'D:\Users\g3gg0\Downloads\corrupt_frame_'
    File D:\Users\g3gg0\Downloads\corrupt.mlv opened
    File D:\Users\g3gg0\Downloads\corrupt.m00 not existing.
    Processing...
    
    Vertical stripes correction:
      1.000  1.000  1.001  1.003  1.002  1.000  1.003  1.000
    Reached end of chunk 1/1 after 907 blocks
    Processed 2 video frames
    Done
    
    
    
     MLV Dumper v1.0
    -----------------
    
    Mode of operation:
       - Input MLV file: 'D:\Users\g3gg0\Downloads\corrupt.mlv'
       - Convert to DNG frames
       - Output into 'D:\Users\g3gg0\Downloads\corrupt_frame_'
    File D:\Users\g3gg0\Downloads\corrupt.mlv opened
    File D:\Users\g3gg0\Downloads\corrupt.m00 not existing.
    Processing...
    
    
    Vertical stripes correction:
      1.00000  1.71034  1.00000  1.68231  1.00000  1.67310  1.00000  1.71324
    Cold pixels : 0
    Reached end of chunk 1/1 after 907 blocks
    Processed 2 video frames
    Done
    
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