search

openpreserve / jpylyzer

JP2 (JPEG 2000 Part 1) validator and properties extractor. Jpylyzer was specifically created to check that a JP2 file really conforms to the format's specifications. Additionally jpylyzer is able to extract technical characteristics.
http://jpylyzer.openpreservation.org/
Other
69 stars 28 forks source link

Question about new PLM marker support #228

Closed boxerab closed 2 months ago

boxerab commented 2 months ago

Hello! This is not specific to jpylyzer, but have you ever encountered an image with PLM markers in the wild ? I have never seen one, as it seems everyone uses PLT markers, but I am curious about if PLM was ever used. Thanks!

boxerab commented 2 months ago

ahhh, I see I asked this same question 3 years ago :)

bitsgalore commented 2 months ago

@boxerab Actually there's a file with a PLM marker in the Jpylyzer test files repo:

https://github.com/openpreserve/jpylyzer-test-files/blob/master/files/oj-plm-main-header.jp2

If you run jpylyzer on it with the --packetmarkers option you'll see this:

            <plm>
                <lplm>12</lplm>
                <zplm>0</zplm>
                <nplm>0</nplm>
                <iplm>00,01,00,05,04,04,00,00</iplm>
            </plm>
boxerab commented 2 months ago

@bitsgalore thanks! I will take a look at that one.