Hi Tim & Daan, * Thank you* for your information; it was very helpful.
Regards Sai Kumar S On Wednesday 12 June 2024 at 20:54:20 UTC+5:30 DSpace Community wrote: > Hi Sai & Daan, > > The filter-media script always loops through all objects to *determine* > which ones need to be processed. This script is in charge of *not only* > thumbnails, but also for extracting text for indexing purposes (and any > other actions that are enabled as "filter.plugins" in your dspace.cfg). > See the full docs at > https://wiki.lyrasis.org/display/DSDOC7x/Mediafilters+for+Transforming+DSpace+Content > > So, this script doesn't keep a list of objects which have already had > generated thumbnails. The reason is that, even if a file has a generated > thumbnail, it's possible the file needs to be processed by other filters > (e.g. for full text indexing the textual content may be extracted). So, > every time you run "filter-media" it will loop through every file...but > will skip any files that it notices were already processed (e.g. if the > file already has a thumbnail or extracted text, it will not re-generate it > unless you use the "-f" flag to force regeneration). > > The "skip mode" (-s flag) concept can also be used to tell it to skip > entire communities/collections/items...but then it will never process that > object again until it is removed from the skip list. So, this should be > used sparingly unless you are sure the object never will need a new > thumbnail or full text indexing, etc. > > There are options to process files little by little (using the "-m" or > maximum flag) or even process files community-by-community or > collection-by-collection (using the "-i" or identifier flag) in order to > break down a larger job into smaller chunks. > > This is simply how this tool works at this time. I do agree there may be > ways to make it more efficient. But, we haven't had a developer volunteer > to do such work or to redesign the current process. If you or anyone else > out in the community are interested in helping to improve this tool, I'm > sure the Committers would welcome ideas. All code in DSpace is > built/support by volunteers and users. We don't have a centralized > development team (i.e. I have no developers working for me). > > Semi-related this this, there have been past discussions about migrating > all media filter scripts/tools into curation tasks (which would allow these > processes to be run one-by-one as each new submission is added to DSpace, > instead of via the current bulk processing script). There's some older > tickets/PRs related to that, but it has never been finished / found to be > fully working. See https://github.com/DSpace/DSpace/issues/6398 and > https://github.com/DSpace/DSpace/pull/1674 (That said, I'd love to see > this work completed at some point.) > > Tim > > > > On Tuesday, June 11, 2024 at 8:58:49 AM UTC-5 [email protected] > wrote: > >> Hi Daan, >> >> Thankyou for your reply >> >> As you said if I have to restore an entire database and the assetstore, >> it depends whether the thumbnail have been generated before taking the >> backup, or if thumbnail were generated then no need to regenerate the >> thumbnail from the scratch(I may not be correct, if any information I have >> given is wrong please correct). >> >> As I wanted to know is that when I keep for generating thumbnail, why it >> starts from scratch(but the generated thumbnail gets skipped anyways) >> >> I thought is there any other method where already generated thumbnails >> does not get read and only generates the required(means which does not have >> thumbnails) >> >> Regards >> Sai Kumar S >> >> On Tue, 11 Jun 2024, 11:06 am Daan Lessing, <[email protected]> wrote: >> >>> Good morning, >>> >>> Just a follow-up question on this. Let's say for instance you have to >>> restore an entire database and the assetstore, do you lose all thumbnails >>> and will filter-media have to start building thumbnails from scratch? >>> >>> I have been running filter-media and it has been running for 3 weeks and >>> not yet completed. >>> >>> Looking forward to your response. >>> >>> Kind regards, >>> Daan >>> >>> >>> >>> >>> >>> [image: Mailtrack] >>> <https://mailtrack.io?utm_source=gmail&utm_medium=signature&utm_campaign=signaturevirality11&;> >>> Sender >>> notified by >>> Mailtrack >>> <https://mailtrack.io?utm_source=gmail&utm_medium=signature&utm_campaign=signaturevirality11&;> >>> 11/06/24, >>> 07:32:08 >>> >>> On Tue, Jun 11, 2024 at 6:28 AM SAI KUMAR S <[email protected]> >>> wrote: >>> >>>> Hi Tim >>>> >>>> Thank you for the information. >>>> >>>> The issue is that when we run the command line *./dspace filter-media*, >>>> the thumbnail-generated files are also read, but they are skipped. This >>>> means the process reads the files from the beginning each time, which >>>> takes >>>> more time as the number of files increases. >>>> >>>> Is there any other method, such as executing a script, for generating >>>> thumbnails more efficiently? >>>> Regards >>>> Sai Kumar S >>>> >>>> On Tuesday 11 June 2024 at 02:37:15 UTC+5:30 DSpace Community wrote: >>>> >>>>> Hi Sai, >>>>> >>>>> If you run "filter-media" **without** the "-f" flag, then it should >>>>> automatically skip all Items that already have generated thumbnails. >>>>> For >>>>> example: >>>>> >>>>> ./dspace filter-media >>>>> >>>>> When you run it **with** the "-f" flag, that tells the filter-media >>>>> script to **regenerate all thumbnails**. >>>>> >>>>> For more information see the documentation on this script >>>>> <https://wiki.lyrasis.org/display/DSDOC7x/Mediafilters+for+Transforming+DSpace+Content#MediafiltersforTransformingDSpaceContent-Executing(viaCommandLine)> >>>>> . >>>>> >>>>> (The "skip list" is only needed if you have files which are >>>>> consistently throwing errors and you want to *skip them from all future >>>>> runs* of the "filter-media" script. But, it shouldn't be necessary in >>>>> your >>>>> use case.) >>>>> >>>>> Tim >>>>> >>>>> On Monday, June 10, 2024 at 5:09:33 AM UTC-5 [email protected] >>>>> wrote: >>>>> >>>>>> Hi All, >>>>>> >>>>>> I have a query regarding filter-media. I have uploaded around 1000 >>>>>> books to a collection and generated thumbnails for the PDF files using >>>>>> the >>>>>> command line *dspace filter-media -f.* >>>>>> >>>>>> However, when I upload another 1000 files to the same collection, I >>>>>> need to generate thumbnails only for the newly uploaded files. I tried >>>>>> using the skip mode by creating a *skip-list.txt*, but I am not >>>>>> getting the desired result. >>>>>> >>>>>> Could anyone of you provide me an example of how to correctly use the >>>>>> skip-list.txt method to generate thumbnails? >>>>>> >>>>>> Alternatively, is there any other method, such as using a script >>>>>> (e.g., Python), to generate the thumbnails for only the newly uploaded >>>>>> files? >>>>>> >>>>>> Please help me solve this query. >>>>>> >>>>>> Thanks & Regards >>>>>> Sai Kumar S >>>>>> >>>>>> -- >>>> All messages to this mailing list should adhere to the Code of Conduct: >>>> https://www.lyrasis.org/about/Pages/Code-of-Conduct.aspx >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "DSpace Community" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/dspace-community/07d120cd-74de-4420-b49d-d3ee6744738an%40googlegroups.com >>>> >>>> <https://groups.google.com/d/msgid/dspace-community/07d120cd-74de-4420-b49d-d3ee6744738an%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> -- All messages to this mailing list should adhere to the Code of Conduct: https://www.lyrasis.org/about/Pages/Code-of-Conduct.aspx --- You received this message because you are subscribed to the Google Groups "DSpace Community" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/dspace-community/b8a75621-7081-4f06-8e05-6b763b5b1a98n%40googlegroups.com.
