metadata

问题 How to extract metadata from a image like this website? I have used exev2 library but it gives only limited data as compared to this website. Is there some more advanced library? I have already tried hacoir-metadata Python library. Also how does Windows extract details of image (the one we see from properties)? 回答1: PNG files are made up of blocks, most of which are IDAT blocks which contain compressed pixel data in an average PNG. All PNG's start with a IHDR block and end with an IEND block.

问题 How to extract metadata from a image like this website? I have used exev2 library but it gives only limited data as compared to this website. Is there some more advanced library? I have already tried hacoir-metadata Python library. Also how does Windows extract details of image (the one we see from properties)? 回答1: PNG files are made up of blocks, most of which are IDAT blocks which contain compressed pixel data in an average PNG. All PNG's start with a IHDR block and end with an IEND block.

问题 I get a file url,for example, http://cidian.youdao.com/download/YoudaoDict.exe how can I get it's version but not download it ? nots 1: if you download the file first on your computer,there are many ways to get it's version, for example ,you can use the window tools "filever.exe" to get the version. but i want to not download it ,at least not download it all.how can I do? Waiting your help! thanks. nots 2: I have tried the way to get a portion of the file to get the version: first, I used the

问题 we right-click a folder or file, and then we can choose "get info" option to show some info. I wonder whether we can do this through objective-c? 来源： https://stackoverflow.com/questions/18500983/how-to-get-the-get-info-pane-in-finder-programmatically-objective-c

问题 Given the path of an mp3 file, how do I create and initialize an IPropertyStore object to operate on the metadata of that file? Specifically, how do I get from here: "C:\\Music\\Viva Las Vegas.mp3" to here: store->GetValue(PKEY_Music_AlbumArtist, &variant); Here's some pseudo-ish code to help clarify what I'm trying to do: #include "stdafx.h" #include <propsys.h> #include <propkey.h> void main () { // property store must somehow represent the mp3 file IPropertyStore* store = "C:\\Music\\Viva

问题 I am extracting audio only from youtube videos using youtube-dl . I would like to write the metadata (i.e. Artist Name and Song Title) into the mp3 file after downloading . My attempt to accomplish this starts with this code: @echo off set dl=https://www.youtube.com/watch?v=2Y6Nne8RvaA youtube-dl --metadata-from-title "%(artist)s - %(title)s" --extract-audio --audio-format mp3 -o "%%(title)s.%%(ext)s" --add-metadata %dl% pause The output from this code is: [youtube] 2Y6Nne8RvaA: Downloading

问题 I am extracting audio only from youtube videos using youtube-dl . I would like to write the metadata (i.e. Artist Name and Song Title) into the mp3 file after downloading . My attempt to accomplish this starts with this code: @echo off set dl=https://www.youtube.com/watch?v=2Y6Nne8RvaA youtube-dl --metadata-from-title "%(artist)s - %(title)s" --extract-audio --audio-format mp3 -o "%%(title)s.%%(ext)s" --add-metadata %dl% pause The output from this code is: [youtube] 2Y6Nne8RvaA: Downloading

问题 I need to be able to query a PostgreSQL database to obtain information about the indexes present and their details. On SQL Server, I can do the following to get a list of all tables/indexes/columns for all indexes: select TABLE_NAME, INDEX_NAME, NON_UNIQUE, COLUMN_NAME from INFORMATION_SCHEMA.STATISTICS where TABLE_SCHEMA = 'my_schema' order by TABLE_NAME, INDEX_NAME, SEQ_IN_INDEX It seems that the STATISTICS table of INFORMATION_SCHEMA is a SQL Server extension. How can I do the equivalent

问题 I need to be able to query a PostgreSQL database to obtain information about the indexes present and their details. On SQL Server, I can do the following to get a list of all tables/indexes/columns for all indexes: select TABLE_NAME, INDEX_NAME, NON_UNIQUE, COLUMN_NAME from INFORMATION_SCHEMA.STATISTICS where TABLE_SCHEMA = 'my_schema' order by TABLE_NAME, INDEX_NAME, SEQ_IN_INDEX It seems that the STATISTICS table of INFORMATION_SCHEMA is a SQL Server extension. How can I do the equivalent

问题 I need to add metadata to a PDF which I am creating using prawn. That meta-data will be extracted later by, probably, pdf-reader. This metadata will contain internal document numbers and other information needed by downstream tools. It would be convenient to associate meta-data with each page of the PDF. The PDF specification claims that I can store per-page private data in a "Page-Piece Dictionary". Section 14.5 states: A page-piece dictionary (PDF 1.3) may be used to hold private conforming